动态第838页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2017年08月31日

Leyland Cypress (x Cupressocyparis leylandii) is a large, fast-growing, evergreen conifer that can easily reach 60-80’ in height and 20’ wide. It has a natural pyramidal shape and elegant, dark green, fine-textured foliage. When they become too large or unsightly, trimming Leyland Cypress trees becomes necessary.[图片]Leyland Cypress Pruning Leyland Cypress is often used as a quick screen because it can grow up to 4 feet per year. It makes an excellent windbreak or property boundary border. Because it is so large, it can quickly outgrow its space. For this reason, the native East Coast specimen looks best on large lots where it is allowed to maintain its natural form and size. Since Leyland Cypress grows so wide, do not plant them too close together. Space them at least 8 feet apart. Otherwise, the overlapping, scraping branches can wound the plant and, therefore, leave an opening for disease and pests. In addition to proper location and spacing, pruning Leyland Cypress is occasionally needed – especially if you don’t have enough room or if it’s outgrown the allotted space.[图片]How to Trim a Leyland Cypress Tree Pruning Leyland Cypress into a formal hedge is a common practice. The tree can take severe pruning and trimming. If you are wondering when to prune Leyland Cypress, then summer is your best time frame. During the first year, trim the top and sides to start forming the shape you desire. During the second and third year, trim just the side branches that have wandered out too far to maintain and encourage foliage density.[图片]Leyland Cypress pruning changes once the tree reaches the desired height. At that point, annually trim the top six to twelve inches below the desired height. When it regrows, it will fill in more thickly.

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2017年08月31日

Gardeners in need of quick privacy hedges love quick-growing Leyland cypress (x Cupressocyparis leylandii). When you plant them in an appropriate location and provide good culture, your shrubs may not suffer from Leyland cypress diseases. Read on for information about the main diseases of Leyland cypress trees, including tips on treating disease in Leyland cypress plants.[图片]Preventing Leyland Cypress Diseases Prevention is easier than cure when it comes to diseases of Leyland cypress trees. Your first, best steps toward keeping these attractive evergreens healthy is planting them in appropriate sites. The second step is giving them the best care. A healthy, vigorous plant shakes off problems with more ease than a stressed plant. And Leyland cypress disease treatment is often impossible or ineffective. So save yourself the time and effort involved in treating disease in Leyland cypress. Plant these shrubs in a sunny location in soil offering excellent drainage. Space them far enough apart to let air pass between them. Provide water during times of drought and check your hardiness zone. Leyland cypress thrive in U.S. Department of Agriculture plant hardiness zones 6 through 10.[图片]Diseases of Leyland Cypress Trees If your shrubs are ill, you’ll have to learn something about the different Leyland cypress diseases to figure out what’s wrong. Diseases of Leyland cypress generally fall into three categories: blights, cankers and root rots. Blight The symptoms of needle blight diseases include needles browning and dropping. Usually, this begins on the lower branches. These are fungal diseases, and the spores spread from branch to branch by rain, wind and tools. Placing the shrubs far enough apart to allow air and sun to get through the branches helps prevent needle blight. If it’s too late for prevention, prune out infected branches. Thorough application of a fungicide can help but is difficult on tall specimens.[图片]Canker If your Leyland cypress needles turn red-brown or you see cankers on the trunks or branches, the shrubs may have a canker disease, like Seiridium or Botryosphaeria canker. Cankers are dry lesions, often sunken, on stems and branches. Surrounding bark can show a dark brown or purplish discoloration. Canker diseases are also caused by fungus, and usually only attack stressed plants. When it comes to treating disease in Leyland cypress, fungicides are not effective. The only Leyland cypress disease treatment for this is to prune out infected branches, being sure to sterilize the pruners. Then start a program of regular irrigation.[图片]Root rot Root rot diseases cause dying roots leading to yellowing foliage. It is often caused by inappropriate planting in an area where the soil does not drain well. Once a shrub has root rot, chemical Leyland cypress disease treatment is not effective. As with the other diseases, the best way of treating disease in Leyland cypress is to give the plants appropriate cultural care.

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2017年08月31日

If you love the effect of an evergreen tree and the brilliant color of a deciduous tree, you can have both with larch trees. These needled conifers look like evergreens in spring and summer, but in the fall the needles turn golden yellow and drop to the ground.[图片]What is a Larch Tree? Larch trees are large deciduous trees with short needles and cones. The needles are only an inch or so long, and sprout in little clusters along the length of the stems. Each cluster has 30 to 40 needles. Tucked in among the needles you can find pink flowers that eventually become cones. The cones start out red or yellow, turning to brown as they mature. Native to many parts of Northern Europe and Asia as well as Northern parts of North America, larches are happiest in cold climates. They grow best in mountainous areas but tolerate any cool climate with plenty of moisture.[图片]Larch Tree Facts Larches are tall trees with a widespread canopy, best suited to rural landscapes and parks where they have plenty of room to grow and spread their branches. Most larch tree types grow between 50 and 80 feet tall and spread as much as 50 feet wide. The lower branches may droop while the mid-level branches are nearly horizontal. The overall effect is similar to that of a spruce. Deciduous conifers are rare finds, and they are well worth planting if you have the right location. Although most are massive trees, there are a few types of larch trees for gardeners with less space. Larix decidua ‘Varied Directions’ grows 15 feet tall with irregular branches that give it a distinctive winter profile. ‘Puli’ is a dwarf European larch with lovely weeping branches held close to the trunk. It grows up to 8 feet tall, and 2 feet wide.[图片]Here are some standard-sized larch tree varieties: European larch (Larix decidua) is the largest species, said to grow up to 100 feet tall, but rarely exceeds 80 feet in cultivation. It is known for its brilliant fall color. Tamarack (Larix laricina) is a native American larch tree that grows up to 75 feet tall. Larix decidua ‘Pendula’ is a shrubby larch that becomes a ground cover if not staked upright. It spreads as much as 30 feet.[图片]Growing a larch tree is as snap. Plant the tree where it can get at least six hours of sunlight per day. It can’t tolerate hot summers and should not be planted in U.S. Department of Agriculture zones warmer than 6. Frozen winters aren’t a problem. Larches won’t tolerate dry soil, so water often enough to keep the soil moist. Use organic mulch to help the soil hold moisture.

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2017年08月31日

Tamarack tree planting is not difficult, nor is care for tamarack trees once they are established. Read on for information about how to grow a tamarack tree.[图片]Tamarack Tree Information Tamaracks (Larix laricina) are medium-sized deciduous conifers that are native to this country. They grow wild from the Atlantic all the way across to central Alaska. If you look for tamarack tree information, you may find it under other common names for this tree, like American larch, eastern larch, Alaska larch or hackmatack. Given the huge range of the tamarack, it tolerates extremely varied climatic conditions, from -30 degrees to 110 degrees Fahrenheit (34 to 43 C.). It can thrive in regions where rainfall is only 7 inches annually and also where it is 55 inches annually. That means that wherever you live in the country, growing tamarack trees may be possible. The trees also accept varied types of soil. However, tamaracks grow best in wet or at least moist soil with a high organic content like sphagnum peat and woody peat. They thrive on moist, well-drained loamy soils beside rivers, lakes or swamps.[图片]Tamarack Tree Planting Tamaracks are attractive trees with needles that turn brilliant yellow in autumn. These trees could be used as ornamentals far more than they are currently. If you are interested in tamarack tree planting, sow the seeds in warm, moist organic soil. Be sure to clear all brush and weeds before you begin. Your seeds need full light to germinate. In nature, germination rates are low since rodents feast on the seeds, but in cultivation, this should be less of a problem. Tamaracks do not support shade, so plant these conifers in open areas. Space the trees well apart when you are doing tamarack tree planting, so that the young trees do not shade one another.[图片]How to Grow a Tamarack Tree Once your seeds become seedlings, be sure to provide a constant water supply for them. Drought conditions can kill them. As long as they have full light and regular irrigation, they should thrive. If you are growing tamarack trees, you will find that they grow fast. Correctly planted, tamaracks are the fastest growing boreal conifers for their first 50 years. Expect your tree to live between 200 and 300 years. Care for tamarack trees is easy, once they are correctly established. They require virtually no work other than irrigation and keeping down competing trees. The greatest threat to the health of the trees in the wild is destruction by fire. Because their bark is so thin and their roots so shallow, even a light burn can kill them.[图片]The tamarack foliage can be attacked by the larch sawfly and the larch casebearer. If your tree is attacked, consider biological control. Parasites of these pests are now available in commerce.

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2017年08月31日

The Katura tree is a wonderful ornamental plant for cold to temperate regions. Although this is a low maintenance plant, a little information on how to take care of a Katsura tree will help you keep it healthy and strong as an attractive presence in your landscape.[图片]About Japanese Katsura Trees The grown up name for Katsura tree, Cercidiphyllum, refers to a genus of trees from Asia, in particular Japan and China. The trees are suited for moist soil in full sun and get no larger than 45 feet tall. In fact, the majority of the trees are almost better classified as big bushes rather than trees. While there are other varieties, Katsura tree (Cercidiphyllum japonica) is one of the most popular landscape trees. This type hails from Japan and is an economically important deciduous forest tree. The leaves are multi-hued with heavy veins and tones of pink and green. In fall the heart-shaped leaves take on autumnal tones of gold, orange and red before they fall from the tree. Katsura flowers are tiny, white and insignificant, but the foliage has a strong brown sugar smell in fall, which adds to the tree’s appeal. An interesting fact about Katsura trees is that the botanical name translates to ‘red leaf.’[图片]Growing Katsura Trees Katsura trees will thrive in USDA plant hardiness zones 4b to 8. They need plenty of water at establishment, but once they are mature can handle short periods of drought. Plant the tree in well drained soil that is acid or neutral. The plant is sensitive to frost and does drop its leaves once cold temperatures arrive. Choose either full sun or light shade for growing Katsura trees. The trees are weak limbed, so a sheltered spot is preferable with protection from wind gusts. Pruning is not a necessary part of Katsura tree care, but you can remove any damaged or crossed limbs that prevent the tree from producing a strong scaffold.[图片]How to Take Care of a Katsura Katsura trees are slow growing and may take up to 50 years to reach their full size. During this time, if the tree was planted in an appropriate soil and site, it will need very little care. Katsuras are not susceptible to many pests and they are basically disease free. Avoid overhead watering to prevent mildew on the ornamental leaves. Spread mulch around the base of the tree out to the root line to minimize competitive weeds and enhance water conservation.[图片]Lightly prune out suckers and dead wood in spring and apply a 10-10-10 balanced granular fertilizer to the root zone of the plant. Water the fertilizer in well. Young Katsura tree care requires tree wraps and slings to protect the thin bark and establish a firm, strong shape. Water the tree daily for the first year to increase health and growth.

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2017年08月31日

Jatropha (Jatropha curcas) was once touted as the new wunderkind plant for biofuel. What is a Jatropha curcas tree? The tree or bush grows in any type of soil at a rapid rate, is toxic and produces fuel fit for diesel engines. Read on for more Jatropha tree info and see how you rate this plant.[图片]What is a Jatropha Curcas Tree? Jatropha is a perennial shrub or tree. It is drought resistant and easy to grow in tropical to semi-tropical locations. The plant lives for up to 50 years and may grow nearly 20 feet tall. It has a deep thick taproot which makes it adaptable to poor dry soil. The leaves are oval and lobed and deciduous. Overall, the plant is not particularly visually appealing but it does get attractive green cymes of flowerets which turn into a tri-compartment fruit with large black seeds. These large black seeds are the reason for all the hullaballoo, because they are high in burnable oil. An interesting piece of Jatropha tree info is that it is listed as a weed in Brazil, Fiji, Honduras, India, Jamaica, Panama, Puerto Rico and Salvador. This proves how adaptable and hardy the plant is even when introduced to a new region.[图片]Jatropha curcas cultivation can produce oil that is a good substitute for current biofuel. Its usefulness has been challenged but it is true the plant can produce seeds with an oil content of 37%. Unfortunately, it is still a part of the food vs. fuel debate, as it requires land that could go into food production. Scientists are trying to develop a “super Jatropha” with bigger seeds and, therefore, bigger oil yields.[图片]Jatropha Curcas Cultivation Jatropha uses are rather limited. Most parts of the plant are toxic to eat due to the latex sap, but is used as a medicinal. It is useful in treating snakebite, paralysis, dropsy and apparently some cancers. The plant may have originated in Central to South America but has been introduced around the world and flourishes wild in places like India, Africa and Asia. Chief among Jatropha uses is its potential as a clean burning fuel to replace fossil fuels. Plantation cultivation in certain areas has been attempted, but overall Jatropha curcas cultivation has been a dismal failure. This is because the production mass of oil cannot equal the land use by cropping Jatropha.[图片]Jatropha Plant Care and Growth The plant is easy to grow from cuttings or seed. Cuttings result in faster maturity and quicker seed production. It prefers warm climates but can survive a light frost. The deep taproot makes it drought tolerant, although best growth will be achieved with supplemental water occasionally. It doesn’t have any major disease or pest issues in its natural regions. It may be pruned, but flowers and fruit form on terminal growth, so it is best to wait until after flowering. No other Jatropha plant care is necessary.[图片]This plant is useful as a hedge or living fence, or just as an ornamental stand alone specimen.

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2017年08月31日

Japanese snowbell trees are easy to care for, compact, spring-blooming trees. Because of all these things, they are perfect for moderate sized, low maintenance beautifying in places such as parking lot islands and along property borders. Keep reading to learn more Japanese snowbell information, such as planting Japanese snowbell trees and subsequent Japanese snowbell care.[图片]Japanese Snowbell Information Japanese snowbell trees (Styrax japonicus) are native to China, Japan, and Korea. They are hardy in USDA zones 5 through 8a. They grow slowly to a height of 20 to 30 feet, with a spread of 15 to 25 feet. In late spring or early summer, usually in May and June, they produce mildly fragrant white flowers. The flowers appear in clusters of small five petaled bells the show up very clearly as they hang down below the upward growing foliage. The flowers are replaced in summer by green, olive-like fruits that are long lasting and pleasant. Japanese snowbell trees are deciduous, but they’re not especially showy in the fall. In autumn, the leaves turn yellow (or occasionally red) and drop. Their most impressive season is spring.[图片]Japanese Snowbell Care Caring for a Japanese snowbell tree is very easy. The plant prefers partial shade in the warmer zones of its hardy climate (7 and 8), but in cooler areas, it can handle full sun. It does best in somewhat acidic, peaty soil. The ground should be kept moist with frequent watering, but not allowed to get soggy. Only some varieties are hardy down to zone 5, and they should be planted in a spot that’s sheltered from the winter winds.[图片]Over time, the tree will grow up into an attractive spreading pattern. No real pruning is required, though you will probably want to remove the lowest branches as it matures to make way for pedestrian traffic or, even better, a bench underneath it.

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2017年08月31日

Japanese cedar trees (Cryptomeria japonica) are lovely evergreens that become more splendid as they mature. When they are young, they grow in an attractive pyramid shape, but as they grow older, their crowns open further to form a narrow oval. The trunk is straight and tapered with spreading branches that droop toward the ground as the tree develops. Read on for Japanese cedar tree facts including how to care for Japanese cedar.[图片]Japanese Cedar Tree Facts Japanese cedar trees have many ornamental features. Their short, shiny needles are an eye-catching shade of blue-green, arranged in spirals pointing toward the tip of the stems, like foxtails. The foliage bronzes in winter. The wood is fragrant, waterproof, light and resilient. They can live over 600 years. Japanese cedar facts include information about the mahogany colored bark. It peels off in long strips, making the tree ornamental all year long. When you are planting Japanese cedar, remember that the species tree can get to 80 or even 100 feet tall and 20 to 30 feet wide. Their size makes them excellent for windscreens, borders and groupings on large properties. A single tree can also work on smaller properties because of its relatively narrow canopy and slow rate of growth.[图片]Planting Japanese Cedar When you are planting Japanese cedar, select a site that offers moist, acidic, well-drained soil. Ideally, Japanese cedar trees prefer full sun locations, but they also tolerate partial shade. Choose a location with has some air circulation to combat diseases like leaf blight, but don’t pick a site that is exposed to strong winds.[图片]Japanese Cedar Tree Care and Pruning If you are wondering how to care for Japanese cedar, it isn’t difficult. You’ll want to water your Japanese cedar in dry weather. Irrigation is important to keep them alive and looking their best during drought. You can prune off any dead or broken branches to keep the tree’s shape attractive but, otherwise, annual pruning is not required for the health or structure of the tree.[图片]If your yard is small, don’t plan on pruning Japanese cedar to make a tall tree work in a small space. Instead, plant a dwarf cultivar like ‘Globosa Nana,’ a compact tree that grows to 4 feet tall and 3 feet wide.

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2017年08月31日

What is Indian rosewood? Yes, it’s that prized cabinet wood used to make fine furniture, but it’s also a very handsome shade tree with a fragrance that will turn your backyard into a sensory delight. If you are thinking of growing an Indian rosewood (Dalbergia sissoo), you’ll need to learn in advance the requirements for Indian rosewood care. Read on for other Dalbergia sissoo information and tips about inviting Indian rosewood trees into your garden.[图片]What is Indian Rosewood? Before you decide to plant Indian rosewood trees, you might ask: what is Indian rosewood? It’s a tree native to the Indian subcontinent. Its scientific name is Dalbergia sissoo, and it’s rich in common names too, including Dalbergia, Himalaya raintree and penny leaf tree. Dalbergia sissoo information tells us that rosewoods are attractive deciduous trees growing vigorously to some 60 feet tall and 40 feet wide. They do best in USDA hardiness zones 10 and 11, but can also be grown in zone 9 after establishment.[图片]Growing an Indian Rosewood Why grow an Indian rosewood tree? Many gardeners appreciate the rosewood trees for their powerful fragrance. The trees fill with tiny flowers in the springtime, inconspicuous in appearance but bearing a very strong, sweet fragrance. The flowers are followed by interesting pods, slender, flat and brown. The wood is prized for making fine furniture.[图片]Indian Rosewood Care If you start growing an Indian rosewood, you’ll find that the trees are not high maintenance. Indian rosewood care won’t take too much of your time. In fact, Dalbergia sissoo information notes that rosewood trees grow so readily that they are considered invasive in some parts of Florida. Plant Indian rosewood trees in a full sun area or under high shade. These trees tolerate a vast range of soil types, from very dry to very wet. Provide your tree with adequate irrigation when you plant it, and keep it up until the roots are well established.[图片]Prune the tree into a well-formed, single leader tree. The wood is known to be brittle, so prune out branches with tight branch crotches to prevent them from breaking off down the road and injuring the tree.

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2017年08月31日

For additional interest in the landscape, consider growing horse chestnuts. They’re perfect for adding drama either standing alone as a specimen planting or among other tree as a border planting.[图片]What are Horse Chestnuts? You may be wondering, What are horse chestnuts? Horse chestnuts (Aesculus hippocastanum) are large flowering trees, similar to buckeyes, with showy, white blooms in spring. These are followed by attractive, spiny, green seedpods from midsummer through fall. In addition to their beautiful flowers and seedpods, horse chestnut trees also exhibit interesting bark with twisted limbs. One note of caution: do not confuse these ornamental tree with other chestnut trees (Castanea genus), which are edible. The fruit of horse chestnuts should not be eaten.[图片]Growing a Horse Chestnut Tree The most important factor when growing a horse chestnut tree is location. Horse chestnuts thrive in USDA plant hardiness zones 3-8 in areas having full sun and well-drained, but moist, humus-rich soil. These trees do not tolerate excessively dry conditions. Horse chestnut trees are usually planted in spring or fall, depending on climate. Since they are normally purchased as container or burlapped plants, the planting hole should be about three times their width and deep enough to accommodate them with the top of the rootball flush with the soil.[图片]Once the tree is placed in the hole, ensure it is straight before adding some of the soil to anchor it in place. Fill the hole with water, allowing it to absorb before adding organic matter and remaining soil. Tamp down lightly to eliminate any air pockets and add a layer of mulch to help retain moisture and keep out weeds. Water newly planted trees regularly. Established trees require little care other than occasional pruning in late winter as needed.[图片]Growing Horse Chestnut Seeds or Conkers The horse chestnut can also be grown from seeds or conkers. The spiny seedpods drop from the tree in fall when ripened and crack open to reveal the horse chestnut seeds inside. Horse chestnut seeds should be planted as soon as possible. Do not allow them to dry out. They also germinate rather quickly and are best sown outdoors in a cold frame. They can also be placed in a plastic bag outside for a couple of weeks. Once roots begin sprouting, plant them in pots of composted soil. Horse chestnut seedlings can be planted in their permanent locations the following spring or fall, or whenever they reach about a foot or so tall.[图片]Growing a horse chestnut tree is easy and well worth the little effort involved. The tree makes a wonderful addition to the landscape for years of enjoyment.

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