动态第148页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2018年08月15日

When to prune sedum (Sedum spp.) is a question that is not answered with just a simple date. Pruning the flowering perennial, which grows in U.S. Department of Agriculture plant hardiness zones 3 through 10, depends on the size of the plant, the variety and how you want it to look. A compact, low-growing sedum requires different maintenance pruning than a tall, late-blooming variety. [图片]Before You Prune Before you prune your sedum, disinfect your pruning tools. Pruning shears are best for cutting back tall plants, while snips work well for pinching or clipping leaves. After brushing any dirt from the tool blades, disinfect the blades by soaking them for at least five minutes in a household disinfectant. After removing the tool from the disinfectant, rinse the blades with clean water and let them dry before using them on your plants. Repeat the disinfecting process before pruning another plant to avoid spreading disease. Pinching for Shape To encourage branching and low growth on young plants, pinching is recommended. To pinch the plant, use your fingers or pruning snips to remove the center growth from the top of a stem. Take care not to damage the buds or small leaf sets on either side of the center growth; these buds are where the branching will occur. Pinch back new plants when they are about 8 inches tall. You can still pinch off up to 2 inches after blooms start to appear, but it will delay flowering. The result is sedum with more horizontal growth, less vertical growth and added fullness. Late Spring Pruning A more severe pruning is required to encourage bushiness on an older plant that has gotten top heavy or leggy. To encourage new plant growth and get a fuller plant, cut the sedum back by one-half in May or June. New flower buds will form on the cut stalks, so you won't be sacrificing any of the showy display for the sake of a neater looking plant. Choose a point about halfway down a stalk and just above a set of leaves to make your cut. Cut cleanly through the stalk with sharp pruning shears, taking care not to damage the leaf set. Repeat with each stalk until the sedum is a uniform height. Early Spring Pruning Some varieties of tall sedum, such as "Autumn Joy" (Sedum x "Autumn Joy"), which grows in USDA zones 5 through 9, flower through the winter and need cut back in late winter or early spring. You can cut the sedum back in winter as soon as the flowers fade or any time after that until you see green peeping from the ground in spring. Cut the entire plant back to ground level using pruning shears or break the stalks at ground level by hand. In the spring, the sedum will re-emerge from the roots. [图片]Year-Round Pruning Some types of pruning are necessary year-round. This includes pruning out dead plant growth and cutting out diseased plant material. Removing these from your sedum as you see them will help keep the plant looking its best, keep it healthy and less prone to fungal or insect infestations. Cut dead stalks back to the base of the stalk. Pull any dead leaves when you spot them. Remove diseased portions of the plant to keep disease from spreading. Make sure you cut back far enough that you are leaving only healthy plant material. Make the cut just above a leaf set for new growth. Do not compost diseased sedum material.

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Miss Chen

2018年08月15日

Pampas Grass (Cortaderia selloana) creates a tall, flowing feature in your garden when in full bloom. Planting at the appropriate time for your geographical area is important if you want the plants to have tall 10-foot plumes by late summer. The grass thrives in warm temperatures and is a perennial in U.S. Department of Agriculture plant hardiness zones 8 through 10. Cooler growing zones can also plant pampas grass, but is will only grow as an annual. Pampas grass is considered invasive in some areas of the U.S. [图片]Preparing Planting Area Pampas grass produces long, feathery plumes and can have an aggressive growth pattern. Begin planting preparation by choosing a planting area that will not hinder the growth or block other plants. Clear the area and work the soil to a minimum depth of 12 inches about one month before the desired planting date to give the soil time to settle. Dividing Existing Plants Pampas grass is a clump-growing plant that is easily divided to obtain new plants. Dividing plants in early spring offers the best results with transplanting and root establishment before the height of the summer growing season. Remove the entire plant from the soil by digging around the root mass and gently pulling out the plant. Carefully break the root mass into smaller clumps that contain both root and grass stems. Plant the pampas grass transplants in a new location immediately and at the same depth they were previously growing. Wear gloves when handling pampas grass, as the blades are sharp and can cut your hands. Starting From Seed Planting pampas grass from seeds can begin during the late winter months. This gives the seeds enough time to germinate and grow into strong seedlings before planting them in an outdoor garden in spring. Most plants do not produce viable seeds because both male and female plants are required for pollination. Planting Seedlings Depends on Climate The date pampas grass seedlings are planted outdoors is dependent on the geographical area. USDA zones warmer than zone 7 rarely get freezing temperatures in the spring that will damage the plants. Gardeners in these warmer USDA zones can successfully plant pampas grass year-round. Those in cooler USDA zones should wait until after the last hard frost of the spring season. [图片]Benefits Of Containers Use large pots with good drainage holes to grow pampas grass if you are concerned about the plant spreading or becoming too aggressive in your garden. Growing in pots allows you to plant the grass earlier in spring, since you can easily move the pot indoors or into a protected area if there is a risk of damaging temperatures.

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Miss Chen

2018年08月15日

No matter where you live, you can quickly bring a taste of the tropics to your indoor or outdoor garden by growing bird of paradise. Known botanically as Strelitzia reginae, this colorful, eye-catching plant lights up any garden. [图片]Bird of Paradise Features Showy bird of paradise flowers consist of orange, blue and white, which form to resemble an exotic bird's beak. There's also a variety that has all white flowers. Each bird of paradise flower can last up to two weeks on or off the plant. The plant's foliage is also dramatic. The large, green, textural leaves make a statement even when the plant isn't blooming. Bird of Paradise History Native to South Africa, bird of paradise is widely cultivated throughout South America today. The plant got its botanical name when it was introduced to England in 1773 by Sir Joseph Banks, who ran Kew Gardens at the time. He named the plant Strelitzia after Queen Charlotte, wife of George III. She lived at Kew Gardens for several years. Where to Grow Bird of Paradise Bird of paradise makes an excellent accent in the landscape. Use the plant around pools and spas to add a tropical feel or put bird of paradise in a pot and display it as a focal point. When grown in containers, bird of paradise can be displayed on patios, balconies and decks. Bird of paradise requires full sun outdoors to thrive. The plant is frost sensitive, so it can only be grown outdoors year-round in frost-free climates, such as zones 9 through 12. If you wish to grow bird of paradise outdoors in other zones, do so in the spring and summer when night temperatures are 60 degrees and above. Grow the plant in a container and bring it indoors when nighttime temperatures drop in fall. Bird of Paradise Grown as a Houseplant Bird of paradise does well when grown indoors as a houseplant, as such a warm environment is ideal. The plant requires a bright, sunny location, such as in front of an eastern or southern window. Bird of paradise also does well when grown under full-spectrum lighting. Bird of Paradise Care and Maintenance With consistent care, bird of paradise can thrive. Though the plant is drought tolerant once established, it grows best when you keep the soil moist but not soggy. This will generally require that you water the plant once a week when grown in the ground. Container-grown plants will require more frequent watering, especially when temperatures are high. [图片]Fertilize bird of paradise once in spring and again in summer with an all-purpose fertilizer designed for flowering plants. Always follow the package directions on the fertilizer, as too much can burn plant roots and damage the plant. Bird of paradise is a self-cleaning plant that tends to shed its own leaves when necessary. That means it rarely needs pruning. When you do prune, remove dead foliage and spent flower stalks.

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Miss Chen

2018年08月15日

Hibiscus plants produce a flower that evokes the tropics. It is a large colorful bloom with a cluster that includes a brightly colored, elongated stamen, decorated with multiple anthers and topped with five to six stigmas. Although most hibiscus are tropical to subtropical, a few cold-hardy varieties are called hardy hibiscus. Hibiscus are in the family Malvaceae, which also represents mallow, hollyhock and even cotton. The flowers can be between 4 to 8 inches and are found in pinks, yellows and whites. [图片]Family Malvaceae All members of the Malvaceae family have similar characteristics. The family comprises shrubs, trees and herbs and extends to 75 genera and 1,500 species. Most of these have fine hairs on the stems and a mucilaginous sap. The flowers bear five petals and come in a variety of colors. The petals have a crumpled paper or ruffled appearance. The leaves on plants in the Malvaceae family are alternate, simple and veined. The flowers are where family members bear the most resemblance. Plants in the Family Plants in the family Malvaceae bear characteristic whorls of blooms. Rose of Sharon or Althea is a common perennial shrub with pink to red blooms on woody stems. Abutilon is a frost-tender plant grown as either an annual or perennial. It forms small drooping flowers that have the same basic characteristics as the hibiscus. Mallow or Malva is a common plant that can produce a large bush or sprawling ground cover. Visual Similarity In appearance, the rose mallow in the genera Malva has the most similar flowers. It also has the same shape of leaf, although hibiscus has a glossier tone. The mallow flowers are about 4 inches across, and it grows best in full sun but can tolerate partial shade. The flower hues are not as varied as hibiscus and only come in white, pink and rose red. Mallow is often mistaken for hibiscus and is in the same family. [图片]Cultural Similarity Althea is the most similar to hibiscus culturally. It requires full sun and moist, well-drained soil and should be watered thoroughly but infrequently and not allowed to dry out. As with the hibiscus, monthly dilutions of fertilizer will help it flourish and bloom all season. As with large hibiscus, pruning early in spring encourages blooms and a more compact growth habit. The plant doesn't tolerate freezing conditions and should be covered or brought indoors in freezing weather. Both plants can be propagated by seeds or by cuttings.

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Miss Chen

2018年08月14日

Kalanchoes are perennial, short-day-blooming succulent plants that bear bunches of small blossoms on branching bracts. They are typically grown indoors, but can be placed outside whenever temperatures are warm enough, or if winter temperatures don't get low enough to harm them. Grown indoors or outside, kalanchoes still need bright light, dry periods between watering and room to spread their root system. [图片]Hardiness Zone While temperatures of 50 to 60 degrees Fahrenheit will keep the Kalanchoes in bloom, freezing temperatures can kill them. In zones 10 and 11, they can be planted directly in the landscape with minimal winter protection and will function as perennials. Even a few hours of temperatures near 40 degrees can kill unprotected kalanachoes. Location Kalanchoes are lovely in or out of bloom, but need short daylight hours to produce blooms. Kalanchoes planted where nighttime lighting reaches the leaves may not produce blooms as often as those planted where they have long stretches of darkness at night. In zones 10 and 11, summertime direct sunlight can burn the leaves. Planted near a deciduous tree with dappled shade, kalanchoes benefit from more winter sun and less summer sun. Moving Indoors North of zone 11, kalanchoes are grown as summer annuals, or must be planted in pots so they can be moved indoors when frost threatens. If they are set outdoors in an area with intense, full sunlight, they must be gradually adjusted to the lower light levels they will experience indoors. [图片]Considerations Heavy winds can break the succulent stems of kalanchoes or even uproot them. Place the container in a sheltered area. Kalanchoes also do not "play well" with other plants, in that they have a very demanding root system. They need plenty of root space from other plants and particularly don't compete well with grass. The more root room they have in the ground or in their containers, the larger the plant will grow and the more bloom clusters it can support.

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Miss Chen

2018年08月14日

The agave and aloe plants are succulents with fleshy, pointed leaves and a sculptural quality. Both provide a dramatic focal point in a garden. They are admired not only for their attractive form, but for their easy upkeep and drought tolerance. Though they appear superficially similar, there are many differences between the two plants. Agave is used for rope, tequila and a sugar substitute. Aloe is used for lotions and gels. [图片]Origin Though both agave and aloe are native to desert regions, they come from different areas of the world and different families in the plant kingdom. Agave is from the Agavaceae family and is native to Mexico. It is hardy in U.S. Department of Agriculture zones 8 to 10. Aloe, a member of the tree lily family known as Aloaceae, is native to parts of Africa and Arabia. It is hardy in zones 9 and 10. Size Agaves range from 6 inches to 10 feet tall. The smallest is the Agave parviflora, which has sharp pointy leaves with curled fibers on the ends. The Agave mapisaga, on the other end of the spectrum, grows 10 feet feet tall and wide. There are more than 300 species of aloe, ranging from 2 inches across to tree height. Aloe vera, often grown as a houseplant and kept in the kitchen, contains a gel that helps heal minor burns. Larger aloe, such as the 50-foot-tall Aloe bainesii, has ''a grotesquely thickened trunk and tapering branches that make it look like a character out of a Dr. Seuss story,'' according to ''The Book of Outdoor Gardening.'' Flowers Many varieties of aloe have warmly colored red-orange, yellow or white flowers that replenish themselves throughout the plant's life. Aloe marlothii, for example, has side-leaning flowers that resemble red-hot flames blowing in the wind. It blooms year-round. A few agaves have flowers, but most of these bloom only once in the entire life of the plant. Queen Victoria agave is one flowering variety of agave. It blooms only after the plant has lived a decade or more and only in summer. [图片]Leaves The leaves of the aloe and agave may look similar, but they are actually quite different. The agave has a fibrous leaf, with a vascular system of fibers running the entire length of each leaf. These fibers are used to make rope and string. The leaves often last the entire life of the agave. Aloe, on the other hand, has leaves with a gelatinous interior. Fibers are not present. Another difference is the leaf margin. Agave has distinct, sharp teeth on its margin, with a line of demarcation. Aloe has what appear to be teeth, but are actually just elongations of the leaf without any line of demarcation.

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Miss Chen

2018年08月14日

Flowering perennial plants have a life cycle of two years or more. They require less maintenance than annual flowers and they include regional native flowering plants. Familiar flowering perennials include hollyhock, roses, Shasta daisies, carnations, iris, coreopsis, azaleas, hydrangeas and peonies. Native perennials such as Ceanothus, salvia, abutilon, yarrow, columbine and pawpaw, thrive in the natural climate and soil conditions of their native regions and do not require additional soil amendments. [图片]Yarrow Common yarrow, also known as milfoil, is native to the entire United States. It is a member of the aster family of flowers and has many hybridized variations. Yarrow grows 3 feet in height, has lacy gray-green leaves and white or pink flat-topped clusters of flowers. This native flowering perennial adapts easily to a home garden where it spreads through seed from its mature flowers. It has fragrant foliage and has been traditionally used as a medicinal tea for stomach ailments. Yarrow blooms April to July in the south and west and from mid-July through September in the north. Butterfly Weed Butterfly weed, butterfly milkweed, orange milkweed and pleurisy root are the common names for this showy, abundant-blooming native perennial. Its bright yellow-orange flower clusters are 2 to 5 inches across and bloom from May to September. Its sturdy blooms are good cut flowers and are grown with other mid-size flowering perennials. It has a high drought tolerance, very low water usage and prefers sandy, well-draining soil. Indigenous people used the root of this plant as a cure for bronchitis and other lung ailments. Regional native plant nurseries provide seeds and started butterfly weed plants. Great Blue Lobelia Showy lavender blue tubular flowers grow on the stems of the native Great Blue Lobelia. This native plant flowering perennial thrives in moist garden conditions in sun or shade, in clay or sandy soil. It blooms July to September. It is commercially available through native plant nurseries, propagated by divided root clumps or seed. Seeds sprout easily on a slightly scratched soil surface. Great Blue Lobelia attracts birds and butterflies to the garden. [图片]Desert Marigold This flowering short-lived perennial is native to the drier regions of the southwestern United States. Seeds are commercially available from online native plant resources. It is easily grown in home gardens where it provides yellow daisy-like flowers that bloom continuously from early spring to fall on a 12 to 18 inch mound. Its leaves are woolly and grayish, with one bloom at the end of each slender, leafless flower stalk. The desert marigold thrives in dry soil, part shade and extreme heat. It has very low water requirements and it attracts bees and butterflies.

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Miss Chen

2018年08月14日

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Miss Chen

2018年08月14日

Lilies (Lilium spp.) produce tall stems lined with many lance-like leaves and produce a cluster of flowers in late spring to early fall, depending on species. Over 100 lily species exist and hundreds more hybrid cultivars, such as those known as LA Hybrid, Asiatic or Orienpet lilies. Deadheading is the process of trimming off old, withering flowers with the hope of encouraging reblooming. Deadheading lilies is for aesthetic purposes only; lilies do not rebloom once their primary flowering display ends. [图片]Reasons to Deadhead A gardener does not need to deadhead lilies in order for the plant to remain healthy. People concerned with tidy garden appearance may choose to trim off old, spent lily flowers from the stem tips to make the plant look better. Lily flowers that are not cut off will develop into a three-chamber capsule that forms seeds. If you want the clump of lily plants to grow more robust, cut off the seed capsules so the plant energy goes into developing larger bulbs in the ground. Otherwise, resources are put into producing seeds. How to Deadhead Lilies The structure and form of flowers on lilies vary by species, so take the time to examine the flower tip on plant stems before deadheading. You may opt to pluck off old lily blossoms one at a time by snipping them off where the short stem attaches to the main flower stem or stalk. Or, you can wait for all flowers in the lily cluster to wither before making one cut to trim off the upper reaches of the lily stalk. Caveats Do not cut off more of the main leafy stem stalk of a lily than necessary to remove the old flowering tip. You want as many leaves to remain as possible, since they make carbohydrates from sunlight that replenishes and enlarges the underground lily bulbs. Lily bulbs produce daughter bulbs at their base during the summer, thereby increasing the clump. In subsequent years, multiple large lily bulbs grow and produce more flowers than a lone lily bulb. [图片]Insights on Other Plants Called Lily Horticulturists refer to species in the genus Lilium as "true lilies." Other members in the larger lily family, Liliaceae, and other plant families are also given common names of lily. Daylily, Peruvian lily, waterlily, lily-of-the-Nile, lily-of-the-valley, calla lily and toad lily are examples. These types of "false" lilies may or may not benefit from deadheading -- it depends on the individual species.

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Miss Chen

2018年08月13日

Cordyline australis, also known as cabbage palm, is an exotic-looking tropical plant available in a variety of sizes and colors. The lance-shaped leaves are green or red with visible veins in shades of red, green or purple. Cordyline australis is a non-fussy plant ideal for beginners, with enough visual interest to captivate the most experienced gardeners. Cordyline australis is suitable for growing in U.S. Department of Agriculture hardiness zones 10b to 11. In cooler climates, plant Cordyline australis in a container, then grow the plant as an indoor plant or bring it indoors before the temperature drops in autumn. [图片]Step 1 Plant Cordyline australis in nearly any well-drained soil where the plant will be exposed to moderate sunlight. A location with plenty of bright morning sunlight is best, as hot afternoon sunlight is too intense. If you prefer to grow Cordyline australis indoors as a potted houseplant, locate the plant near, but not directly in front of a sunny window. Containerized plants do best when planted in a pot filled with any commercial potting soil. A pot with a drainage hole is crucial. Step 2 Water Cordyline australis only when the soil feels dry, as the plant is drought-tolerant and may rot if soil is allowed to remain soggy. Water deeply enough to reach the roots, then allow the soil to dry before watering again. Check containerized plants often, especially if the plants are located outdoors during warm weather. If the potting soil feels dry, water until the water runs through the drainage hole, then allow the excess water to drain freely. Step 3 Fertilize Cordyline australis every other week. In-ground plants benefit from a balanced, liquid or granular fertilizer applied at the rate specified on the fertilizer label. Feed containerized plants a balanced water-soluble fertilizer mixed according to specifications on the container. Always apply fertilizer to moist soil, then water deeply immediately after fertilizing to ensure the fertilizer reaches the root zone. Avoid splashing fertilizer on the foliage.

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