动态第169页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2018年06月29日

Description: This plant is a summer annual about 2-8" tall and similarly across. Large plants are abundantly branched, although small plants are sometimes unbranched. The slender stems are green or reddish green, terete, and glandular-hairy. The leaves occur in opposite pairs or in whorls of 3. They are up to 1" long and ½" across, pinnately lobed, green, and glandular-hairy. Each leaf has 3-7 linear-oblong lobes and a few dentate teeth or small secondary lobes. Because of the sticky foliage, the entire plant may become brownish green if it becomes immersed in muddy water. Individual flowers are produced from the axils of the upper leaves (one flower per leaf axil). Each flower has a tubular corolla up to ¼" long and a calyx with 5 linear-lanceolate teeth. The corolla is pale blue-violet, lavender, or nearly white, and weakly two-lipped. The upper lip has 1-2 shallow lobes, while the lower lip has 3 shallow lobes. There is no nectar spur on the corolla. The calyx is green and glandular-hairy. The pedicels are up to ¼" long, green or pale reddish green, terete, and glandular-hairy. The blooming period occurs from mid-summer into the fall. Individual plants may bloom intermittently for 1-2 months, if not longer. Each flower is replaced with an ovoid seed capsule that is about the same length as the calyx teeth (less than ¼" in length). Each capsule contains many tiny seeds that are light brown and dust-like. The seeds can be carried aloft by the wind or float on water. The root system consists of a shallow branching taproot and fibrous secondary roots. This plant reproduces by reseeding itself. Cultivation: The preference is light shade to full sun, wet to moist conditions, and soil that is muddy, sandy, gravelly, or rocky. Growth and development occur primarily during the summer and early fall. This plant can tolerate occasional inundation by water if it is temporary. It is intolerant of competition from taller ground vegetation. [图片]Range & Habitat: The native Obe-wan-Conobea occurs occasionally in most areas of Illinois, except in the NW, extreme north, and some south-central counties (see Distribution Map). Outside of Illinois, it is found in the Midwest and south-central states. Habitats include prairie swales, sand and gravel bars along rivers, muddy borders of ponds, edges of springs in wooded areas, rocky depressions in limestone bluffs, sandy ditches, edges of mud puddles, and gravelly areas around parking lots. This plant is often found in disturbed areas that are partially shaded; it is also found in higher quality habitats. [图片]Faunal Associations: Very little is known about floral-faunal relations for this plant. Small bees probably visit the flowers for nectar and possibly pollen. The glandular hairs of the foliage probably deter ants from robbing the nectar. It's possible that the tiny seeds can cling to the muddy feet or moist feathers of waterfowl (especially ducks and geese). When the waterfowl visit other wetlands, this would spread the seeds into new areas. Photographic Location: Gravelly ground near a parking lot at a shopping mall in Champaign, Illinois. Comments: This is another small annual plant of the Figwort family that produces small tubular flowers. Because of its diminutive size, Obe-Wan-Conobea is easy to overlook, especially when it isn't blooming. The small annual plants of the Figwort family occur in either dry areas or wetlands where there is scant or low ground vegetation. Obe-Wan-Conobea is found in wetlands or moist wooded areas. It differs from other plants in this group by its pinnately lobed leaves, which are sometimes whorled. This makes Obe-Wan-Conobea relatively easy to identify. The derivation of the strange common name comes from a publication of Floyd Swink, who named this plant after a character in the movie Star Wars, although the publisher did not discover this until after his book was already published (John White, personal communication). Another common name for this plant is Narrow-Leaved Paleseed, which was undoubtedly invented by a botanist. A scientific synonym for this species is Conobea multifida.

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Miss Chen

2018年06月28日

Is your knowledge of succulent plants based on that dusty jade plant in the office corner? The popularity of succulent plants has exploded in recent years, due not only to the low care requirements of these sun lovers, but also because of the diversity these fascinating plants. Special anatomical adaptations and colors make some succulents look like they belong more on another planet than on our windowsill. Here are ten unusual succulents that will add personality and distinction to your garden or houseplant collection. [图片]1.Mexican Hens and Chicks 'Topsy Turvy' The Echeveria genus of succulents, also known as Mexican hens and chicks, encompasses hundreds of rosette-forming plants native to Mexico, Central America and South America. The squared-off leaf tips of Echeveria 'Topsy Turvy' give it a sea urchin appearance and look handsome when planted in groups or combined with other succulents in a dish garden. Plant 'Topsy Turvy' in a chartreuse pot to show off its pale bluish-green leaves. [图片]2.Plover Eggs Sometimes called plover eggs plant, Adromischus cooperi sports pudgy little leaves dotted with purplish-grey speckles. The plants are especially sensitive to frost and must not be exposed to temperatures lower than 45 F. The speckles on plover egg plants will become more pronounced in bright sunlight. Plants are easy to propagate by leaf cuttings. Twist off a leaf from the stem and insert into moist cactus mix. Roots will form in four to six weeks. [图片]3.Crinkle Leaf Plant A South African relative of the kalanchoe, crinkle leaf plants (Adromischus cristatus) feature triangular leaves with lightly ruffled tips. Crinkle leaf plants tolerate a light frost, but grow best in a cool sunny spot with infrequent waterings. Red and white flowers may peek out between the two-inch leaves on mature plants. [图片]4.Pebbled Tiger Jaws Faucaria felina is the kind of plant that both attracts and repels the temptation to touch the strangely serrated leaves. In addition to the fascinating leaf form of pebbled tiger jaws, the plants may produce golden yellow flowers that nearly obscure the plant in fall and winter. Pebbled tiger jaw plants fill a niche for those who need a shade-tolerant succulent, but they also require more irrigation than most succulents. If the plants become too dry and the leaves separate from the stems, you can use them to start new plants if you act quickly. [图片]5.Baseball Plant Euphorbia obesa is just the plump character to beef up your indoor container garden. Its spherical shape adds heft and textural interest to plantings, but don't bear the spines one would expect on a round succulent. A weekly watering is pleasing to the baseball plant, and will help it to live a long life in your home. Petite flowers may appear on the top of the globe, giving you a signal that the plant is thriving.

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Miss Chen

2018年06月28日

[图片]6.Graptoveria 'Topsy Debbie' Graptopetalums like 'Topsy Debbie' form rosettes of leaves that spread by offsets, which easily form new plants for your propagating pleasure. Plants must grow in full sun for best health and vigor. [图片]7.Aloe hawthoroides The classic aloe plant has gotten an update: Aloe hawthoroides has dozens of feathery bristles on each leaf, which are all bark but no bite. This touchable plant has a moderate growth habit and is tolerant of a wide variety of growing conditions, as long as you don't let it freeze or sit in stagnant water. [图片]8.Kalanchoe rhombopilosa Who can resist a plant called "pies from heaven?" This kalanchoe is but one of the many strange and beautiful living things that hails from Madagascar. The leaves are fuzzy, grey and covered with brown streaking. Insignificant yellow flowers may appear on stalks in the spring. Give your kalanchoe abundant light for healthy plants. Continue to 9 of 10 below. [图片]9.Echeveria gibbiflora 'Barbillion' If you've ever observed the fleshy wattle of a turkey or rooster, you have seen something these fowl have in common with echeveria 'Barbillion:' they are both carunculated. This term refers to a bumpy, fleshy growth. Is it beautiful or hideous? Give it plenty of light and water sparingly, and see if the unusual appeal of this succulent grows on you. [图片]10.Echeveria 'Blue Curls' A single specimen of echeveria, 'Blue Curls' makes an exquisite statement in a container with its frilly leaves and pink and aqua coloration. Prevent water from accumulating within the rosette and remove dead leaves from the plant's base to keep pests from interfering with its vigor.

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Miss Chen

2018年06月28日

Description: This perennial wildflower is a herbaceous vine about 1½-4' long that branches occasionally. This vine climbs adjacent vegetation for support using its tendrils. The stems are light green, yellowish green or reddish green, glabrous or nearly so, and winged. Alternate compound leaves occur at intervals along these stems; they are even-pinnate with 3-4 pairs of leaflets. At the end of each compound leaf, there is a branched tendril. The leaflets are ¾-2" long and about ¼" (6 mm.) across; they are narrowly elliptic in shape, smooth along their margins, and sessile or nearly so. The upper blade surface is medium green, while the lower blade surface is pale green. All parts of the compound leaf are glabrous or nearly so. The petioles and rachises of the compound leaves are light green, yellowish green, or reddish green; they are glabrous or nearly so. At the base of each petiole, there is a pair of stipules about ¼-1" long. Each stipule is half-sagittate or half-hastate in shape; it has a basal lobe that tapers to a point, a terminal tip that tapers to a point, and an outer margin that is mostly smooth, although it may be slightly undulate or toothed. Sometimes the foliage of this wildflower is sparsely and minutely pubescent (puberulent). Individual racemes of 2-8 flowers develop from the axils of compound leaves; the peduncles of these racemes are about as long as, or a little shorter than, the length of the compound leaves. Each flower is about ½-¾" long, consisting of 5 petals with a pea-like floral structure, a tubular calyx with 5 teeth, several stamens, and a pistil with a single style. The petals consist of an upright banner and a pair of projecting wings that enclose the keel. These petals are mostly reddish purple; although the petals forming the keel and the base of the remaining petals are more pale. The banner has a network of purple veins. The calyx is reddish purple and mostly glabrous, although its teeth may be slightly ciliate along their margins. The blooming period occurs from late spring to mid-summer, lasting about 1 month. Afterwards, the flowers are replaced by elongated seedpods about 1-2½" long, ¼" across, and flattened. Each seedpod splits open into two valves to release its seeds. The small seeds are globoid in shape and somewhat flattened. The root system is fibrous and rhizomatous. At favorable sites, clonal colonies of plants often develop from the rhizomes. Cultivation: The preference is full or partial sun, wet to moist conditions, and soil containing loam or sand. Standing water is tolerated if it is occasional, rather than permanent. In the absence of some kind of structural support, this vine will sprawl across the ground. Range & Habitat: The native Marsh Pea is occasional in the northern half of Illinois, while in the southern half of the state it is rare or absent (see Distribution Map). More broadly, it has a circumboreal distribution, occurring in both North America and Eurasia. Habitats include wet prairies, interdunal swales, borders of marshes, fens, sedge meadows, low areas along streams, soggy thickets, and swamps. This wildflower occurs in both sandy and non-sandy habitats. [图片]Faunal Associations: The flowers attract primarily bumblebees and other long-tongued bees that feed mostly on nectar. Other insects feed on foliage, flower tissues, or plant juices of Marsh Pea and other Lathyrus spp. These species include Acyrthosiphon pisum (Pea Aphid), caterpillars of the butterflies Everes comyntas (Eastern Tailed Blue) and Leptotes marina (Marine Blue), and Cerotoma trifurcata (Bean Leaf Beetle). In the past, the seeds of Lathyrus spp. were eaten by the extinct Passenger Pigeon. Photographic Location: Moist sandy ground near a river at Illinois Beach State Park in Lake County, Illinois. [图片]Comments: The typical variety of Marsh Pea (Lathyrus palustris palustris), as described here, has winged stems, narrow upright leaflets, and relatively dark reddish purple flowers. Mohlenbrock (2014) also describes another variety of Marsh Pea (Lathyrus palustris myrtifolius) that has stems without wings. Some authorities do not recognize distinct varieties, preferring to lump them together as a single species. This variety of Marsh Pea can be distinguished from other Lathyrus spp. (Vetchling species) by the number leaflets per compound leaf (typically 6 or 8), the shape and size of its stipules, the color of its flowers, and the number of flowers per raceme. Another species, Veiny Pea (Lathyrus venosus), differs from the typical variety of Marsh Pea by having more leaflets per compound leaf, wider leaflets, and more flowers per raceme. Non-native Lathyrus spp. (Vetchling species) in Illinois are quite distinct because they have only 2 leaflets per compound leaf.

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Miss Chen

2018年06月28日

Description: This herbaceous perennial wildflower is usually an emergent aquatic that is exerted 1-3' above the water line, otherwise it is a terrestrial plant of similar height. The stems are usually unbranched, although larger plants are sometimes branched below. The stems are light green, angular-terete, and glabrous. At intervals along each stem, there are pairs of opposite leaves about 2-6" long and ¼-1" across that are either sessile or short-petioled. The deciduous leaves are narrowly lanceolate, linear-lanceolate, elliptic, or narrowly elliptic in shape and usually smooth along their margins. Less often, the outer margins may be slightly undulate or shallowly crenate. Both the upper and lower surfaces of the leaves are medium green and glabrous. From the axils of the middle to upper leaves, there develops individual spikes of flowers on long peduncles. Each floral spike is about 1" long and capitate (head-like) in appearance; there are several overlapping flowers and buds per spike. Each flower is about ¾" across, consisting of a short-tubular corolla with 4 lobes, a short-tubular calyx with 5 teeth, 2 stamens with dark purple or dark brown anthers, and an ovary with a slender white style. The corolla has a shallowly notched upper lobe that curves backward, 2 lateral lobes that are widely spreading, and a lower lobe that curves slightly downward. Except for the dark purple mottling at the base of the lower lobe, the lobes are mostly white, otherwise they are tinted pale purple or they are lightly speckled with fine purple dots. The lobes of the corolla are longer than the corolla tube, and they are oblong to oblong-oblanceolate in shape. The green calyx is about ¼" long and glabrous; its teeth are narrowly lanceolate. The ascending straight peduncles are a little shorter to about as long as the leaves (up to 6" in length); they are medium green, angular, and glabrous. The blooming period occurs from early summer into the fall, lasting about 2-4 months. Usually, only a few flowers are in bloom at the same time. Afterwards, the flowers are replaced by seed capsules up to ½" long that taper to stipe-like bases. Each capsule has 2 cells, and each cell contains 2 seeds. The seeds are about 1/8" (3 mm.) in length and warty. The root system is highly rhizomatous, forming colonies of plants. [图片]Cultivation: The preference is full or partial sun, shallow standing water (up to 3' deep) or wet conditions, and soil that is muddy, sandy, or gravelly. Range & Habitat: The native Water Willow is occasional in most areas of Illinois, except the NW section of the state, where it is uncommon or absent (see Distribution Map). Habitats include sandbars, gravelbars, or mudbars of rivers, low islands in rivers or ponds, shallow water or muddy banks of ponds and rivers, shallow water of rocky upland streams, shallow water or wet areas of swamps, and sandy marshes. Water Willow occurs in wetlands with either stagnant water or slow to moderate currents of water. Faunal Associations: The flowers are cross-pollinated primarily by bees, including honeybees, bumblebees, Anthophorine bees (Anthophora spp.), little carpenter bees (Ceratina spp.), cuckoo bees (Epeolus spp., Triepeolus spp.), long-horned bees (Melissodes spp., Synhalonia spp.), leaf-cutter bees (Megachile spp.), green metallic bees, and other Halictid bees. Other floral visitors include various wasps, bee flies (Bombyliidae), thick-headed flies (Conopidae), Syrphid flies (non-pollinating), small butterflies, and skippers. These insects obtain primarily nectar from the flowers, although some bees collect pollen and some flies feed on pollen. Water Willow is one of the host plants for the caterpillars of Darapsa versicolor (Hydrangea Sphinx); they feed on the foliage. This plant is also a minor source of food for muskrats. [图片]Photographic Location: A sandy marsh at the Heron Boardwalk in Vermilion County, Illinois. Comments: The flowers of Water Willow are fairly showy and bloom intermittently for a long period of time. In spite of its common name, this is a non-woody herbaceous plant that is not closely related to willows (Salix). Water Willow is the most northern member of its genus. Another species that can be found in southern Illinois, Justicia ovata (Southern Water Willow), is a slightly smaller plant with wider leaves and more loosely flowered spikes. Otherwise, these two species have a similar appearance and prefer similar habitats. A scientific synonym of Water Willow is Dianthera americana.

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Miss Chen

2018年06月28日

Description: This perennial plant is 2-3' tall. It produces clumps of basal leaves that are sword-shaped and up to 3' long; they are mostly erect, although some of the larger leaves may become arched. These leaves are bluish green to green and glabrous. Individual leaves are up to 1" across near their bases, tapering very gradually to pointed tips. Leaf margins are smooth (entire) and leaf venation is parallel. The flowering stalks are either unbranched or sparingly branched and up to 3' tall; they are green, terete, and glabrous. Each stalk produces one or more small alternate leaves that are erect and sword-like. From the axil of each alternate leaf, there develops 1-2 flowers on pedicels 1-5" in length. Both the flowering stalks and pedicels are terete and glabrous. Each pedicel is enfolded by a pair of sword-like spathes that become chaffy with age. The blue-violet flowers are up to 3½" across, consisting of 3 sepals, 3 petals, 3 stamens, 3 style-branches with stigmata, and a green ovary that is elongated and angular. The petaloid sepals are oblanceolate in shape and spread outward from the center of the flower; they are blue-violet with prominent patches of yellow and white with fine purple veins. The sepals are without tufted hairs. Extending directly above the sepals, are the shorter petaloid style-branches; they are blue-violet and oblong in shape with upturned tips, forming open tubular structures with the sepals. The ascending petals are blue-violet and oblanceolate in shape with darker purple veins. The blooming period is late spring to early summer, and lasts about a month for a colony of plants, although individual flowers are short-lived. There is a pleasant floral fragrance. Afterwards, the flowers are replaced by oblongoid capsules that are 3-angled. These capsules are about 1½–2" long and ½" across; they contain rows of tightly stacked seeds. After the capsules split open, the seeds can float on water, spreading to new areas via water currents. The root system consists of fleshy rhizomes with coarse fibrous roots. Colonies of plants often develop from the rhizomes. [图片]Cultivation: The preference is wet to moist conditions, partial to full sun, and a rich organic soil. In light shade, this plant often fails to flower, and it tends to decline in abundance if conditions become too dry. The foliage is rarely bothered by disease. To maintain the viability of the seeds, they should not be allowed to dry out – store them with some moist sand. Range & Habitat: The native Blue Flag Iris is surprisingly common in most areas of Illinois, except for some southern and western counties where it is uncommon or absent (see Distribution Map). Habitats include wet to moist black soil prairies, prairie swales, soggy meadows along rivers, open bottomland woodlands, swamps, fens, seeps, edges of ponds and streams, ditches, and low-lying ground along railroads and roadsides. Declining remnant populations can be found in some low woodland areas where fire has been surpressed. [图片]Faunal Associations: The flowers are cross-pollinated by bumblebees and long-horned bees (Synhalonia spp.); butterflies and skippers also visit the flowers occasionally, but they are less effective at cross-pollination. These insects suck nectar from the flowers primarily, although some of the bees also collect pollen. Some insects feed on Blue Flag Iris and other Iris spp. destructively. They include such species as the weevil Mononychus vulpeculus (larvae feed inside seed capsules), the Agromyzid fly Cerodontha magnicornis (larvae mine leaves), the Syrphid fly Eumerus tuberculatus (larvae feed on rhizomes), the mealybug Rhizoecus falcifer (feeds on rhizomes), the aphid Dysaphis tulipae (feeds on foliage & rhizomes), and the thrips Frankliniella occidentalis (feeds on flowers). Caterpillars of such moths as Ctenucha virginica (Virginia Ctenucha), Spilosoma congrua (Agreeable Tiger Moth), and Macronoctua onusta (Iris Borer Moth), also feed on these plants. Mammalian herbivores rarely bother this plant because the foliage and rootstocks are somewhat toxic, causing irritation of the gastrointestinal tract. [图片]Photographic Location: The photographs were taken at a wet prairie along an abandoned railroad near Urbana, Illinois, and at a prairie swale in Meadowbrook Park of the same city. Comments: This attractive plant is more typical of wetlands than true prairies, but it sometimes spreads into adjacent sunny areas that are moist. Cultivars of Iris X germanica (German Iris) have beards (numerous hairs) on their sepals, while the Blue Flag Iris is beardless. The Blue Flag Iris resembles another native species, Iris brevicaulis (Blue Marsh Iris), but this latter species has 6-angled capsules and flowering stalks that are slightly zigzag. Another native species, Iris versicolor (Northern Blue Flag), is very similar in appearance to the Blue Flag Iris, but it has a more northern distribution (the upper Great Lakes and NE USA, including northern Wisconsin). Another scientific name for the Blue Flag Iris is Iris shrevei; another common name for this species is the Southern Blue Flag.

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Miss Chen

2018年06月27日

[图片]1.Aeonium Plants Aeoniums are odd looking succulent plants, with long, arching stems and rosettes of leaves that can often look so perfect, you might think they were fake. You'd be forgiven if you had to touch one to tell if it was real or rubbery plastic. There are about 35 species and most are native to the Canary Islands. They prefer a Mediterranean climate - not too hot, not too cold, not too dry. The plants form fleshy rosettes and you will notice a similarity between Aeoniums and several other succulent plants, most noticeably Echeveria and Sempervivum, the popular Hens and Chicks. Aeoniums can be low growers or branching plants that grow into shrubs. Leaves: Rosettes with somewhat rounded leaves. Stems can be short and stubby or long and branched. Leaves can be solid colors or variegated in white, yellow, red and green. Flowers: Flowers stems emerge from the center of the rosettes. The small, star-like flowers grow in clusters. Botanical Name Aeonium Common Names The genus Aeonium does not have a common name. Hardiness Zones Most Aeonium varieties are only hardy in USDA Zones 9 – 11, although they can withstand occasional frosts down to about 25̊ F (-4̊ C). Sun Exposure As with most succulents, Aeonium plants grow best in full sun to partial shade. In hot summers and desert conditions, light shade may be necessary. Mature Plant Size Size will vary greatly with variety. Some Aeonium varieties are low growing and get only a few inches tall, with rosettes an inch or two across. Others will branch out and grow 3 – 4 feet tall with plate-sized rosettes. Bloom Period Most Aeonium bloom in late winter or spring. Using Aeonium in Your Garden Design When grown in the garden, Aeoniums command the most attention in masses. Tall varieties can look like bonsai when they get shrubby. You can trim them if they get leggy. The cuttings will readily root and make new plants, helping you fill out your planting area. Needing so little soil, Aeoniums make great container plants. You can get a closer look at their unique features in containers, and have better control over their growing conditions. In high humidity or rainy areas, you may not need to water them, although they do need regular water. Keep close tabs on them and use your judgment. Using a regular potting soil, rather than a fast draining soil for succulents, will help maintain their moisture level. Suggested Aeonium Varieties Aeonium arboreum – Widely available. Bright green rosettes on a branching stem. Aeonium arboreum "Atropurpureum:: Maroon leaves if grown in bright light. Aeonium arboreum "Zwartkop": Very dark, almost black leaves. Aeonium "Garnet": A hybrid of "Zwartkop", with red leaves. Aeonium davidbramwelli "Sunburst'": Rosettes up to 1 foot across. Pale yellow, white and green stripes, with pink tips. Can handle some frost. Aeonium haworthii "Tricolor" or "Kiwi": Easy growing. 4-inch flowers have pale yellow centers when young, maturing to red and green. [图片]2.Growing and Caring for Aeoniums Aeonium Growing Tips Water: Aeoniums do not like really hot or dry weather. They may go dormant in summer and do not require any water, except in excessively dry conditions. In extreme heat, their leaves will curl, to prevent excessive water loss. Growing them in moist shade will keep them growing in high heat, but their true growth season is winter to spring, when temperatures are cool (65–75 F.) and damp. In the winter, water whenever the soil has dried out. Test by poking your finger down into the soil an inch or two. Too much moisture or allowing them to sit in wet soil will cause root rot. Soil: A sandy loam or regular potting mix is better than a mix specifically for succulents and cacti since Aeonium need some moisture. If you are growing them in containers, re-pot every 2 –3 years with fresh potting soil. Fertilizer: Feed during the growing season with a half-strength balanced fertilizer, every month or so. Do not feed while dormant. Caring for Your Aeonium Plants If you have the proper growing conditions, Aeonium will take care of themselves and actually thrive on neglect. Otherwise, your major task will be moving them from hot sun to shade and back again or moving them indoors when the temperature drops too low. Aeonium have underdeveloped root systems since they store their water in their leaves and stems. They have the ability to produce roots along their stems, which you may notice if the plant gets pot bound or the stems fall and touch the soil. The stem roots will quickly turn the fallen pieces into new plants. Leggy branches do tend to fall over and snap off, from the weight of the rosettes. If this happens, you can re-plant the broken stem. Most Aeoniums die after flowering. If the plant has produced side shoots, those side shoots will live on. If not, the entire plant will die off. That's why it is nice to periodically start new plants from cuttings. You can also start new plants from the seed. Pests and Problems: Few pests bother Aeoniums. Slugs can do some damage and the occasional bird may take a bite. Here are More Drought Tolerant Succulent Plants to Grow.

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Miss Chen

2018年06月27日

[图片]1.Agave Plants Agave plants are best known as succulent plants with large leaves that end in spiny tips. At first glance, you probably wouldn’t call agave plants rosettes, although they are. So many of the common ones are spiny succulents, with leaves that jut out in often dangerous spikes. There is actually a lot of variety in the agave genus. There are the large, stiff specimens that can grow to 20 feet in diameter. There are also small dish-sized agaves, and agave plants with soft leaves and no spines, although most do have leaves that end in a sharp point. Leaves: Agaves are all stemless, or nearly so, with strappy, succulent leaves that end in sharp points. Foliage tends toward a blue-green in hardier varieties and a gray-green in warm climate varieties. There are also some that are variegated with gold or white markings. Flowers: When the plant matures, a tall, flower-stalk grows out of the plant’s center. The flowers are bell-shaped and long-lasting, in shades of white, yellow and green. For most agave species, once the flowers produce the berry seed pods, the plant dies. Botanical Name Agave Common Names Agave plants are generally referred to as agaves. Agave americana as the Century Plant and that common name is sometimes confusingly used for all species of agave. Cold Hardiness Zones Most agave plants are not frost-hardy, but there are some, like Agave parryi, that are reliably perennial to USDA Hardiness Zone 5. However, the majority of them are only hardy in USDA Zones 8 or 9 and up. Light Exposure Agave plants need a spot in full sun to partial shade. The hotter the climate, the more shade they can handle. Mature Size Of Agave Plants There is a lot of variety in the size of agave plants. They can mature from a few inches tall to 20+ feet in diameter. Agave Bloom Period Agaves are grown for their dramatic foliage, not their flowers. That's a good thing because they bloom only once when they are fully mature. That can be anywhere from 5 to 40 years. Agave plants tend to bloom earlier in cultivation than they would in the wild. Most plants die after flowering, however, there are usually small offset plants at the base that can be replanted. Garden Design Tips for Agave Plants One large agave is all that is needed to make a sculptural focal point. Just make sure there is plenty of room to walk around it, so no one gets stabbed. They can also make a nice border grouping, either by planting several of the same species or a tapestry of different varieties. They are textural and sculptural and make a vivid contrast with other plants. Pairing them with ornamental grasses softens their hard edges. In warm climates, agaves are popular around pools and patios. Their leaves don’t brown and drop frequently and they stay attractive all year. A spineless variety, like the Foxtail Agave (Agave attenuata), is a safe bet around heavily used areas. Smaller agave plants are excellent for containers, indoor or out. Suggested Agave Varieties Agave attenuata - A popular spineless variety also known as the Foxtail or Dragon-Tree Agave. Grows about 4 - 5 feet tall and a bit wider. Agave parviflora - Leaves have white, graphic markings and curling filaments that give it a hairy look. It only gets about 6 inches tall and blooms in 6 - 8 years with green flowers on a 4 - 6 ft. spike. Agave tequilana azul - Weber's Blue Agave is used to make a tequila, in Jalisco, Mexico, but it is also a very attractive garden plant, reaching upwards of 6 ft. tall and flowering in 6 - 8 years with a 15 ft. spike of yellow blooms. Agave victoria-reginae - As the plant matures, the broad leaves cup inward, forming a dome. Reaches a height of about 12 inches. Cream flowers appear in 20 - 30 years [图片]2.Growing and Caring for Agave Agave Growing Tips Agaves thrive on neglect. They grow quickly and remain attractive all year. Here are some tips for getting your agave plants established. Propagation: Since it can take years for an agave plant to produce seed, most are propagated by offsets or tissue culture. Soil: Agave will tolerate any well-draining soil, but their preference is rocky or sandy soil. They are not particular about soil pH. Water: Although mature plants are very drought tolerant, when you are first establishing a plant outdoors, water it every 4 - 5 days for the first month. Then once a week, gradually spacing watering to every other week, depending on the weather. Feeding: Don’t feed agave plants. Agaves seem to take care of themselves. Feeding encourages flowering, which you don’t want to happen too soon, since agave plants die off after flowering. Growing Agave Plants in Containers As with many succulent plants, agaves are shallow rooted. You can grow them in any size container, because they don’t need much soil. Use a well-draining soil. You can mix your own with something like 2 - 3 parts potting mix and 1 part gravel. Re-pot container grown plants every couple of years, with new soil. Agaves can produce sucker roots. If the pot is overly crowded with roots, go ahead and cut the roots back to size. Give the plant a week or so to readjust, before you water it again. Water about once a week in the summer and monthly in the winter. Wait until the surface of the soil is dry, before watering. In extremely dry conditions your agave may need more frequent water, but agaves are very forgiving. More on growing agave as a houseplant. Pests and Problems of Agave Plants Agaves have very few problems. The agave snout weevil will burrow into the plant’s center to lay its eggs, causing the plant to collapse. Unfortunately, you probably won’t notice this until it’s too late. Remove the plant and check for any remaining grubs.

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Miss Chen

2018年06月27日

Description: This wildflower is a summer annual about 3-6' tall, branching frequently. The somewhat succulent stems are light green, glabrous, and glaucous. The alternate leaves are up to 4" long and 2" across. They are ovate, hairless, and serrated along the margins; their slender petioles are up to 2" long. From theClose-up of Flowers axils of the middle to upper leaves, short racemes of 1-3 flowers are produced. Each flower is about 1–1¼" long, consisting of 5 petals, 3 sepals, and reproductive organs within the tubular corolla. This corolla is yellow, or less often cream-colored, and consists of the fusion (or near fusion) of the 5 petals and lower sepal. The lower sepal is petaloid; it defines the conical posterior of the corolla, which tapers to a tiny nectar spur that curls downward. The upper petal defines the upper lip (or hood) of the corolla, while the two lower petals form a pair of well-rounded lobes that are rather irregular and wrinkled. Two small lateral petals define the sides of the corolla opening, although they are difficult to see when the flowers are viewed from above. There are usually reddish brown spots within the interior of the corolla, although they are sometimes absent. The upper 2 sepals are light green and ovate in shape; they are located at the top of the corolla, rather than behind or underneath. Each flower dangles from a slender pedicel about ¾" long. The blooming period occurs from mid-summer to early fall and lasts about 2-3 months. Each fertilized flower is replaced by an ellipsoid seedpod up to 2" long. This seedpod is broadest toward the middle, tapering toward its tips; it has several dark green lines along its length. As the seedpod ripens, it splits open and ejects the seeds. The root system consists of a shallow branching taproot. Cultivation: The preference is partial sun, wet to moist conditions, and soil that is loamy or mucky. Yellow Jewelweed also tolerates full sun, light shade, and mesic conditions (if it receives some protection from the afternoon sun). This species is a little more tolerant of dry conditions than Impatiens capensis (Orange Jewelweed). It grows rapidly from seed during the summer and can achieve an impressive size. Range & Habitat: The native Yellow Jewelweed occurs occasionally in central and northern Illinois; it is less common or absent in the southern portion of the state (see Distribution Map). Habitats include muddy borders along ponds and streams (especially in wooded areas), swamps, openings in moist deciduous woodlands, and soggy thickets. Sometimes this species is cultivated in gardens. [图片]Faunal Associations: The nectar of the flowers attracts the Ruby-Throated Hummingbird and bumblebees; the latter are especially common visitors. The caterpillars of various moths feed on the foliage, including Euchlaena obtusaria (Obtuse Euchlaena), Spilosoma latipennis (Pink-Legged Tiger Moth), Trichodezia albovittata (White-Striped Black), and Xanthorhoe lacustrata (Toothed Brown Carpet). The large seeds are eaten by various gamebirds, including the Ruffed Grouse, Ring-Necked Pheasant, Greater Prairie Chicken, and Bobwhite Quail. The White-Footed Mouse also eats the seeds. White-Tail Deer browse on the foliage. Photographic Location: The photographed plants were growing along the back alley of a residential area in Urbana, Illinois. Comments: Yellow Jewelweed is closely related to the more common Impatiens capensis (Orange Jewelweed). It is very similar in appearance to the latter species, except that its flowers are yellow, rather than orange. The tubular corolla of Yellow Jewelweed is broader toward its posterior, and its 2 lower petals are divided at the base, rather than fused together. Both of these Jewelweeds have attractive foliage and large interesting flowers that bloom over an extended period of time.

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Miss Chen

2018年06月27日

Description: This plant is a summer annual that becomes 2-5' tall, branching occasionally. The round stems are glabrous and succulent, pale green to pale reddish green, and somewhat translucent. They are rather fragile and break easily. The alternate leaves are up to 5" long and 2½" across, although they are usually about half this size. The leaves are ovate, thin-textured, and hairless. There are low broad teeth along their margins. While the stems are often shiny, the leaves have a dull upper surface. The slender petioles are up to 2" long and usually shorter than the blades of the leaves. From the axils of the upper leaves, there occurs small clusters of 1-3 orange flowers. These flowers are held horizontally on drooping pedicels. Each flower is about 1" long and has a conical shape with upper and lower lips. There are 3 sepals and 5 petals (although this is difficult to discern). Two lateral sepals are small and membrananous; they are light green to light yellow and are located behind the upper lip. The third sepal forms the conical posterior of the flower, including the small nectar spur. This portion of the flower is typically light orange and shiny; the nectar spur usually bends forward to a position underneath the rest of the flower. The petals form the front of the flower and are usually dark orange with reddish streaks or brown dots. One petal forms the upper lip, which is curved upward, while 2 fused petals form the lower lip. The lower lip often is divided into 2 lobes and functions as a landing pad for visiting insects. There are also 2 smaller lateral petals between the upper and lower lips of the flower. A cluster of stamens with white anthers lies underneath the ovary near the upper lip. The blooming period occurs from mid-summer to early fall, and lasts about 2 months. There is no floral scent. During the fall, insignificant cleistogamous flowers form seed capsules with fertile seeds without any need for cross-pollination. These oblong seed capsules are divided into 5 sections, which split apart, flinging the large seeds a considerable distance. The root system consists of a shallow branching taproot. This plant often forms colonies by reseeding itself. Cultivation: The preference is light shade to partial sun, wet to moist conditions, and a fertile soil with an abundance of organic material. Submergence of the roots by flood water is tolerated for up to 2 weeks without apparent ill-effects. Sometimes the leaves are affected by mildew late in the year. It is easy to start this plant from seed. Range & Habitat: The native Orange Jewelweed is a common plant that occurs in most counties of Illinois; it is less common in the NW area of the state. Habitats include openings in moist woodlands, partially or lightly shaded floodplains along rivers, edges of woodland paths, swamps, seeps and fens, and roadside ditches. This species tolerates disturbance better than most wetland plants. Faunal Associations: The flowers attract the Ruby-Throated Hummingbird and long-tongued bees, including bumblebees and honeybees. Swallowtail butterflies are less common visitors. These visitors seek nectar; many long-tongued bees also collect pollen. Sometimes bumblebees will steal nectar by chewing holes near the spur of the flower. Various smaller insects (e.g., Syrphid flies) will visit the same holes to steal nectar. The caterpillars of several moths feed on the foliage, including Euchlaena obtusaria (Obtuse Euchlaena), Spilosoma latipennis (Pink-Legged Tiger Moth), Trichodezia albovittata (White-Striped Black), and Xanthorhoe lacustrata (Toothed Brown Carpet). Upland gamebirds eat the large seeds, including the Ruffed Grouse, Ring-Necked Pheasant, Greater Prairie Chicken, and Bobwhite Quail. Among mammals, White-Tailed Deer browse on the foliage, while the White-Footed Mouse eats the seeds. Photographic Location: A partially shaded roadside ditch along a woods near Urbana, Illinois. Comments: The attractive orange flowers glisten in the sunlight, hence the name 'Jewelweed.' The other Jewelweed in this genus is Impatiens pallida (Yellow Jewelweed). The latter has similar foliage, but its flowers are pale yellow. The Jewelweeds have a muciliginous sap that is supposed to soothe skin irritation caused by Poison Ivy and Stinging Nettle. This sap also has fungicidal properties and has been used to treat Athlete's Foot. The cultivated Impatiens of the horticultural industry have been introduced from such areas as East Africa and New Guinea. They rarely escape from cultivation and are not considered a significant threat to native habitats.

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