动态第167页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2018年07月03日

Description: This plant is a summer annual about 1–2½' tall, branching occasionally. The stems are terete or somewhat angular and they have spreading white hairs. The alternate leaves are up to 4" long and 2½" across. They are rather thin-textured and have raised veins on their undersides. The leaves are medium green, cordate or broadly ovate, and serrated along their margins. The long slender petioles often have spreading hairs like the stems. Hornbeam Mercury is monoecious with separate male and female flowers on the same plant. The male (staminate) flowers develop from the axils of the leaves in non-terminal spikes about ½–2" long. These cylindrical spikes are densely crowded with small flowers. Each male flower is about 1/8" (3 mm.) across, consisting of 4 sepals that are green or translucent white, several stamens that are white, and no petals. The spikes of female (pistillate) flowers terminate the upper stems; they are usually located above the male flowers. The pistillate spikes are also densely crowded with small flowers, but their appearance is less smooth and cylindrical than the staminate spikes because of the long styles and floral bracts. Each female flower is about ¼" across, consisting of several long branching styles that are white, a green ovary that is quite spiny in appearance, and no petals. At the base of each female flower, there is a surrounding floral bract with several narrow lobes. The blooming period occurs from mid-summer to early fall and lasts about 1-2 months. The flowers are cross-pollinated by the wind. Afterwards, the female flowers are replaced by 3-valved seed capsules; each valve of a capsule contains a single seed. The seeds are ovoid in shape, broader and rounder at one end than the other, and pitted or wrinkled across the surface. The root system consists of a taproot. This plant spreads by reseeding itself, and occasionally forms colonies. [图片]Cultivation: This plant is typically found in full or partial sun, moist to mesic conditions, and a fertile loamy soil. It also occurs in clay-loam and stony soil. At locations that are too hot and dry, the foliage often wilts. Range & Habitat: The native Hornbeam Mercury occurs occasionally in the southern half of Illinois (see Distribution Map). Habitats include thickets, riverbanks, lower slopes of bluffs, cropland, fallow fields, gardens, areas along buildings, and roadsides. This native species prefers disturbed areas and it is a minor pest of cropland in the southern half of the state. Faunal Associations: The flowers don't attract many insects because they are wind-pollinated. Two flea beetles, Hornaltica bicolorata and Margaridisa atriventris, feed on Acalypha spp. The seeds are occasionally eaten by the Mourning Dove and probably other granivorous birds. Deer browse on the foliage of these plants, and possibly other mammalian herbivores do this as well. The foliage may be mildly toxic to cattle because of excess nitrate accumulation. Unlike many other members of the Spurge family, the native Acalypha spp. lack a toxic white latex in their foliage. Photographic Location: A few plants were growing along the foundation of the webmaster's apartment complex in Urbana, Illinois. Comments: Hornbeam Mercury is a nondescript plant that is easily overlooked. Its leaves are supposed to resemble the leaves of hornbeam trees (e.g., Ostrya spp.), hence the common name. Another common name is Rough-Podded Copperleaf, which refers to the spiny-looking seed capsules and the tendency of the foliage to turn reddish brown during the fall. Hornbeam Mercury differs from other native Acalypha spp. by its monoecious flowers (separate spikes of male and female flowers) and its broad serrated leaves that are heart-shaped (cordate) at the base. The leaves remind me of the foliage of woodland plants in the Nettle family, but Hornbeam Mercury occurs in sunnier habitats and the female flowers are surrounded by the lobed bracts that are typical of native Acalypha spp. in Illinois.

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Miss Chen

2018年07月03日

Description: This plant is a summer annual about 2-7' tall that branches occasionally. The stems are terete (circular in cross-section), and pubescent. The alternate leaves are up to 8" long and across (excluding the petioles). They are cordate or orbicular-cordate, slightly dentate along their margins, and more or less pubescent. The primary veins of the leaves are arranged palmately. The petioles are up to 4" long and pubescent as well. The foliage of the entire plant is mostly light green, although the upper surfaces of the leaves are dull green. From the axils of the upper leaves, there occasionally develops a single flower about ¾" across. It consists of 5 petals that are orange-yellow or yellow, 5 sepals that are pubescent and light green, and numerous stamens with golden yellow anthers that surround the pistil in a loose cluster. The flowering stalk of each flower is about 1" long, which is much shorter than the petioles of the leaves. The blooming period usually occurs from late summer to early fall, and lasts about 1-2 months. The flowers are sparingly produced and short-lived. Each flower is replaced by a fruit about ¾" across. It is initially light green, but rather quickly turns brown or black with maturity. This fruit consists of a ring of about 10-15 flattened seedpods. Each seedpod has a stout beak and contains about 5-15 seeds. Each seed is greyish brown, somewhat flattened, and either reniform (kidney-shaped) or cordate (heart-shaped). The root system consists of a stout white taproot. This plant spreads by reseeding itself. Cultivation: Velvetleaf is typically found in full sun, mesic conditions, and a fertile soil consisting of loam or clay-loam. The fertility of the soil, particularly the level of nitrogen, has a strong influence on the size of the plant. The seeds can remain viable in the soil for at least 20 years, if not considerably longer. [图片]Range & Habitat: This is a common non-native plant that occurs in most counties of Illinois (see Distribution Map). Habitats include cropland (particularly corn and soybean fields), abandoned fields, vacant lots, construction sites, and waste areas. Velvetleaf typically occurs where the soil has been recently disturbed and the long dormant seeds are brought close to the soil surface. The seeds germinate during warm weather after the spring tilling of fields, and the new generation of plants develops and matures very quickly during the heat of summer, prior to the fall harvest. As a result, Velvetleaf is a major weed of cropland in Illinois. It was introduced into the United States from India as a possible source of bast. Faunal Associations: The nectar and pollen of the flowers attract various kinds of bees, including bumblebees, long-horned bees (Melissodes spp.), leaf-cutting bees (Megachile spp.), and Halictid bees. Occasionally, small- to medium-sized butterflies visit the flowers for nectar, while Syrphid flies feed on the pollen (Robertson, 1929). Some insects feed destructively on Velvet Leaf. Insects that feed on either the mature or developing seeds include Amara aenea (Common Sun Beetle), Anisodactylus sanctaecrucis (a ground beetle), Harpalus pensylvanicus (Pennsylvania Ground Beetle), Gryllus pennsylvanicus (Fall Field Cricket), larvae of Althaeus folkertsi (Velvetleaf Seed Beetle), Liorhyssus hyalinus (Hyaline Grass Bug), Niesthrea louisianica (Louisiana Hibiscus Bug), larvae of Helicoverpa zea (Corn Earworm Moth), and larvae of Heliothis virescens (Tobacco Budworm Moth); see White et al. (2007), Lundgren & Rosentrater (2007), and Gibb (1991). Some of these insects also feed on the flowers and their buds. The larvae of Calycomyza malvae (a leaf-miner fly) tunnel through the leaves, while Ophiomyia abutilivora (a leaf-miner fly) bore through the stems of Velvet Leaf (Spencer & Steyskal, 1986). The larvae of Pyrgus communis (Checkered Skipper) make folded-leaf nests, from which they feed (Barnes, 1999). [图片]Photographic Location: A vacant lot in Urbana, Illinois. There is a small black bee visiting the flower in one of the photographs. Comments: Velvetleaf is a rather tall and lanky plant with large leaves that is easy to identify in the field because there is really nothing else that resembles it. There are other weedy members of the Mallow family that have been introduced from abroad, but they are much smaller plants. Velvetleaf is about as tall as the native Hibiscus spp. (Rose Mallows), but the latter are perennials with darker foliage and much larger flowers. The seeds of Velvetleaf are reportedly edible. In an outdoor emergency, the soft leaves can be used as a substitute for toilet paper.

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Miss Chen

2018年07月02日

The Michigan Asparagus Advisory Board calls asparagus "one of nature's most perfect foods." This healthful vegetable has no cholesterol or fat and is high in vitamins B6, A, C and thiamine. It's a long-lived vegetable but frost may damage young spears. [图片]Growing Asparagus Asparagus requires a high pH soil of about 7.0. Asparagus crowns are planted 8 to 12 inches apart in a trench that is 6 to 10 inches deep and covered with 3 to 4 inches of soil. Rows are set from four to five feet apart. Organic compost and a small amount of phosphate fertilizer are then added. Plants are allowed to mature without harvesting for the first three years. Ferns After harvesting, the spears grow into ferns with red berries; these ferns produce the nutrients for the crown to produce a good crop the next season. The ferns should never be pruned or cut back. They will die back with winter frost but the underground crown will survive cold weather and be recharged for spring production. [图片]Frost Damage to Spears Frost can kill young asparagus spears when they first emerge from the soil. They will shrivel and turn black, making them inedible. Cut off all damaged spears. An eight-inch layer of organic compost or other mulch will help to keep the soil warmer and protect the crown from very cold weather.

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Miss Chen

2018年07月02日

If you think the gardening season is limited to spring, summer and fall, think again. A surprising number of vegetables grow well throughout the winter, and with a little help from a greenhouse, you'll hardly miss your summer garden. [图片]Greens Many of the typical garden salad greens are suitable for a winter garden. Plant lettuce, spinach, mustard, chard, kale and collards in September for harvest in late winter. Herbs In the herb garden, try sage, parsley, cilantro, rosemary and thyme. These usually grow well in areas with mild winters. Other Vegetables Plant broccoli, cabbage, kale, collards, Brussels sprouts, cauliflower, celery, onions and turnips in September for use in late winter and early spring. Start beets, carrots and peas in August for harvest throughout the winter. [图片]Warm Weather Crops While tomatoes, sweet potatoes, peppers and eggplants rarely survive the entire winter, they can be planted in a greenhouse during the late winter for an early harvest that spring. If you're fortunate enough to have a heated greenhouse, nearly all warm weather crops will grow throughout the winter.

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Miss Chen

2018年07月02日

Over 90 percent of the worlds avocados are grown in California. In order to safely get the avocados across the country, and even across the world, the avocados must be shipped properly. If shipping the avocados for retail purposes, there are specific temperatures, containers and guidelines that must be followed. But for those who are only transporting avocados to friends and family, the shipping process is relatively simple. [图片]Step 1 Pick the avocados. The easiest way to cut the avocados down is by using long clippers. Step 2 Immediately transport the avocados to a refrigerator. This will seal in the freshness and prevent the avocados from fully ripening and possibly going bad. Step 3 Pack the avocados in cartons called lugs. If this form of carton is not available, pack the avocados in a way so they will not shake, move around and become bruised, such as wrapping them in paper. [图片]Step 4 Place the carton of avocados in a container that is safe to contain dry ice and add the dry ice. This will keep the avocados cool during the shipping process. If access to a refrigerated truck or plane is available, the dry ice is not necessary.

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Miss Chen

2018年07月02日

Lima beans (Phaseolus lunatus) look like snap beans when they grow, and they develop as either vining or bush-like plants. Not tolerant of frost, lima bean seeds are sown in moist, fertile soil that is at least 65 degrees Fahrenheit. Time Frame [图片]A general time frame for germination of a lima bean is between six and 18 days. This is after the bean is sown in moist, well-drained soil at an depth of 1 inch in soil that is at least 65 degrees. Factors [图片]Temperature affects the rate of germination, as does the availability of moisture to soften the seed coat and cause the plant embryo to expand. Cool soil temperatures increase the time for germination, while warmer temperatures with ample moisture decrease the time of germination, perhaps to only three to six days. Dry soil never promotes germination. Activity [图片]Lima beans will germinate outside of soil if left in contact with damp paper towels and warm air temperatures. To study factors on germination, sow seeds in damp soil and various controlled/monitored temperatures as well as in a jar filled with damp towels or cotton balls. Note differences in germination rates as well as visually watching the seed transform through the glass jar walls.

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Miss Chen

2018年07月02日

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Miss Chen

2018年07月01日

With container gardens, you can have fresh vegetables all year even when garden space is not available. Zucchini is a summer squash that grows best in full sun and warm conditions. As container culture gains popularity, many new dwarf or small growing varieties of vegetables are being developed; compact zucchini varieties are no exception, and include the culitvars Black Magic, Hybrid Jackpot, Gold Rush and Classic. Grow zucchini indoors all year round. In winter, place the pots in a south facing window where they will get the most sun. [图片]Step 1 Fill 2-inch pots with soil-less seed starting mix. Use a pre-mixed formula available at garden centers or make your own by mixing equal parts vermiculite and peat moss. Dampen the mixture and fill the 2-inch pots. Step 2 Place one zucchini seed in each pot and cover it with 1/2 inch of soil. Place the pots in dappled or filtered sun with a temperature range between 65 and 75 degrees Fahrenheit. Keep the soil around the seedlings damp with frequent light applications of water. The seedlings will germinate in five to seven days and be ready to transplant into a large, permanent container in three to four weeks. Step 3 Fill one 5-gallon container for each zucchini plant. Use a well-draining soil-less potting mix and fill the pot to 1-inch below the lip of the container. Garden centers sell pre-formulated mixes for indoor vegetable container growing. Alternately, mix your own by combining equal parts loam, peat and coarse clean sand. Add a 14-14-14 liquid fertilizer to the mix. Check the back of the package to determine the correct amount. Step 4 Dampen the potting mix with water until it is light and crumbly. Scoop out a shallow hole in the center of the pot large enough to accommodate the root ball of one zucchini plant. Select the strongest of the zucchini seedlings for planting. [图片]Step 5 Slide the seedling out of the small pot and place it into the large container with the base of the stem planted at the same depth in the soil as it was in the seeding pot. Fill in around the roots and pat down the soil to secure the seedling in the pot. Place the potted zucchini in a sunny window where it will get at least five to six hours of sun each day. Step 6 Fertilize once a week using a fertilizer formulated for complete nutrition. There are many combinations on the market for vegetable growing. A good, basic fertilizer formula like a 5-10-10 or a 10-10-10 fertilizer is suitable. Check the package for the correct application amount and method. Step 7 Water when the top of the soil feels dry to the touch, usually daily or every other day for container grown zucchini plants. Soak the soil thoroughly at each watering. Place the pot on a saucer or tray to catch water and protect surfaces. Empty the saucer after every watering to prevent water from sitting around the root system. Step 8 Harvest the zucchini plants as when they are 3 to 4 inches long and still tender. Harvest continuously as the fruits ripen to encourage the plant to keep producing. Zucchini are ready to harvest 50 to 70 days after planting.

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Miss Chen

2018年07月01日

If you're interested in growing potatoes (Solanum tuberosum) in your home garden, don't overlook a variety called Yukon Gold, which yields yellow-fleshed potatoes in the early to middle part of the season. Yukon Gold potatoes are high in vitamin A, which gives them their colorful flesh, and are good for eating unpeeled because they have extra-thin skins. They grow as annuals in all parts of the United States and are easy-to-grow plants, needing only basic care while growing and a bit of special attention at harvest time. [图片]Starting Plants Like most varieties, Yukon Gold potatoes can be started from seed potatoes, which are small tubers grown during the previous season. You can also start plants from pieces of larger potatoes, as long as each piece you plant has at least one bud, or "eye," at its surface. Before planting, allow cut pieces to dry, or heal, for seven to 10 days at 65 degrees Fahrenheit and dust cut surfaces with a powdered fungicide labeled for use on potato pieces; do this in a wind-protected spot and wear gloves to protect your hands. Plant seed potatoes or pieces in early spring, but wait until the soil has warmed to 40 degrees Fahrenheit because Yukon Gold potatoes are a bit slow to sprout, and planting in soil that's too cool can promote growth of fungus. Soil, Sun and Water Yukon Gold potatoes grow best in well-drained soil that's loose and easily dug. If your soil is dense and heavy, and compacts easily, amend it with organic matter such as compost to loosen it while also improving fertility. Space potato pieces 10 to 15 inches apart, setting them in a trench at a depth of 6 inches; deep planting prevents tubers from jutting out of the soil as they grow. For best results, choose a sunny site where plants get at least six hours of sun each day. Plants need regular, consistent moisture during the period of greatest growth, early summer to midsummer; they do best when watered well every two or three days, to reach a total of 1 inch of water weekly, including rain; later in the season, when green tops begin to die back, avoid fungal problems by watering only when soil is dry to the touch. Fertilizing and Hilling Because potatoes form underground, you'll need to bury the plants' tops to ensure that tubers remain covered -- a process called hilling. When plants are about 8 inches tall, cover the lower half of the plants with soil or straw, and repeat this about three weeks later. Fertilizing Yukon Gold potatoes helps ensure a good harvest, starting when you plant seed potatoes or potato pieces. Scatter fertilizer into a small trench about 2 or 3 inches to the side of the planting row, preventing contact of fertilizer with the seed potatoes or pieces because it can burn tender roots. Use about 3 pounds of a granular, 8-16-16 formula for each 100 square feet of planted area. Once plants are about 6 inches tall, repeat fertilization by broadcasting about 2 pounds of the same formula per 100 square feet, applying it in a band about 10 inches away from the plants. [图片]Problems and Harvest Yukon Gold potatoes can attract Colorado potato beetles, yellow and brown striped, hard-shelled insects; control these pests by hand-picking. Aphids -- small, soft-bodied greenish-yellow pests -- might also be a problem; wash plants with a strong water stream early on sunny days to remove and destroy them. Fungal problems such as blight, which might cause limp, blackened leaves and stems, can be prevented by purchasing seed potatoes certified free of the disease. Planting in an area with good air circulation and removing debris regularly from under the plants also keeps down fungus. Yukon Gold potatoes are ready to harvest about 50 days after planting, once vines begin dying back and foliage yellows. Use a fork to lift potatoes gently, then shake off loose dirt, cover tubers with paper or towels and let them dry in a cool, dark place for a few days; store them in a cool spot at 50 to 60 degrees Fahrenheit.

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Miss Chen

2018年07月01日

Growing broccoli in a greenhouse gives you the ability to enjoy fresh broccoli year round. Although a greenhouse offers an enclosed environment in which to grow a variety of seasonal plants, if you live in an area with wide temperature swings, you must still control the temperature inside the greenhouse. Cold nights, for instance, can frostbite plants in an unheated greenhouse, wasting your hard work. [图片]Step 1 Install adequate central heating and cooling in the greenhouse, knowing that greenhouses get only 25 percent of their heat from the sun and require additional heating-and-cooling regulation in regions with moderate to extreme swings in temperature. Step 2 Install two fans, one facing inward, serving as air input and one facing outward, serving as air output (exhaust). Fans help ventillate the air and introduce fresh amounts of carbon dioxide. For small greenhouses of 200 to 600 square feet, select fans capable of moving 5,000 cubic feet of air, and for larger greenhouses of 600 to 1,200 square feet, select fans capable of moving 12,000 cubic feet of air. Step 3 Install wooden crates measuring a minimum of 3 feet wide per row and at least 2 feet deep. Step 4 Spread fertilized soil into the crates to a depth of 23 inches to 24 inches. The soil settles a little, so you should fill the crates as full as possible. Step 5 Plant the broccoli seeds 1 inch deep and about 15 inches to 24 inches apart in a layer of starter fertilizer that offers the broccoli seeds the required nutrients they need to encourage fast growth. [图片]Step 6 Water the soil as the soil becomes dry to the touch, but when the broccoli sprouts, do not water the actual "heads"; water the stalks at their bases. Watering the brocolli heads encourages inedible blossoms. Step 7 Allow the plant to grow 2 1/2 to 3 1/2 months. Step 8 Harvest the plants by snipping them off beneath the head allowing for 5 inches to 6 inches of stalk.

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