动态第827页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2017年09月02日

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2017年09月02日

The Esperance silver tea tree (Leptospermum sericeum) wins a gardener’s heart with its silvery leaves and delicate pink flowers. The little shrubs, native to Esperance, Australia, are sometimes called Australian tea trees or Esperance tea trees. They are easy to grow and require little maintenance when planted in appropriate locations. Read on for more Esperance tea tree information.[图片]Australian Tree Trees It’s easy to fall for the highly ornamental, silver tea tree, a member of the large Myrtaceae family. If you read Esperance tea tree information, you’ll find that the trees produce generous amounts of silky pink flowers annually. The blossoms generally open in spring, but they can flower at any point between May and October depending on when your area gets rainfall. The silvery foliage is beautiful with and without the flowers. Each flower can grow to 2 inches across. Although the plant is only native to granite outcrops in Australia’s Cape Le Grand National Park and a few offshore islands, it is cultivated by gardeners around the world. Hybrids and cultivars of Leptospermum species are available commercially, including some with red flowers. L. scoparium is one of the more popular varieties grown. The Australian tea trees can grow to 10 feet tall, but in exposed areas often stay much smaller. The bushy shrubs are the perfect size for hedges and grow in an upright habit. They are dense plants and spread out into full shrubs.[图片]Esperance Tea Tree Care If you decide to grow silver tea trees, you’ll find that Esperance tea tree care is not difficult. The plants grow happily in sun or partial shade in almost any soil as long as it is well drained. In Esperance, Australia, the plants often grow in shallow surface soil that covers granite rocks, so their roots are accustomed to penetrating deeply into cracks in rocks or in the ground.[图片]Australian tea trees thrive by the coast since they do not mind the salt in the air. The leaves are covered with fine white hairs that give them a silver sheen and also protect them against the effects of salt water. These Esperance plants are also frost hardy to -7 degrees Fahrenheit (-21 C.) in regions that get regular amounts of rainfall.

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2017年09月02日

What is Tamarix? Also known as tamarisk, Tamarix is a small shrub or tree marked by slender branches; tiny, grayish-green leaves and pale pink or off-white blooms. Tamarix reaches heights of up to 20 feet, although some species are much smaller. Read on for more Tamarix information.[图片]Tamarix Information and Uses Tamarix (Tamarix spp.) is a graceful, fast-growing tree that tolerates desert heat, freezing winters, drought and both alkaline and saline soil, although it prefers sandy loam. Most species are deciduous. Tamarix in the landscape works well as a hedge or windbreak, although the tree can appear somewhat scruffy during the winter months. Because of its long taproot and dense growth habit, uses for Tamarix include erosion control, particularly on dry, sloped areas. It also does well in saline conditions.[图片]Is Tamarix Invasive? Before planting Tamarix, keep in mind that the plant has high potential for invasiveness in USDA growing zones 8 through 10. Tamarix is a non-native plant that has escaped its boundaries and, as a result, has created serious problems in mild climates, especially in riparian areas where the dense thickets crowd out native plants and the long taproots draw large amounts of water from the soil. The plant also absorbs salt from the groundwater, accumulates it in the leaves, and eventually deposits the salt back to the soil, often in concentrations high enough to be harmful to native vegetation.[图片]Tamarix is extremely difficult to control, as it spreads by roots, stem fragments and seeds, which are dispersed by water and wind. Tamarix is listed as a noxious weed in nearly all western states and is extremely problematic in the Southwest, where it has severely reduced underground water levels and threatened many native species. However, Athel tamarix (Tamarix aphylla), also known as saltcedar or athel tree, is an evergreen species often used as an ornamental. It tends to be less invasive than other species.

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2017年09月02日

Sycamore trees (Platanus occidentalis) make handsome shade trees for large landscapes. The most striking feature of the tree is the bark that has a camouflage pattern comprised of gray-brown outer bark that peels off in patches to reveal the light gray or white wood beneath. Older trees often have solid, light gray trunks. Sycamores also go by the names buttonwood or buttonball trees. This comes from the 1-inch balls that hang from the tree all winter and fall to the ground in spring. Each ball hangs on its own stringy 3- to 6-inch twig.[图片]Facts about the Sycamore Tree The largest deciduous tree in the Eastern United States, sycamore trees can grow 75 to 100 feet tall with a similar spread, and even taller under ideal conditions. The trunk may be as much as 10 feet in diameter. Sycamores have strong wood with several uses, but as the tree ages, a fungus attacks and consumes the heartwood. The fungus doesn’t kill the tree, but it makes it weak and hollow. Wildlife benefit from hollow sycamore trees, using them as storage chambers for nuts, nesting sites and shelter. The enormous size of a sycamore tree makes it impractical for the average home landscape, but they make great shade trees in parks, along stream banks and in other open areas. They were once used as street trees, but they create a lot of litter and the invasive roots damage sidewalks. You may still see them along streets in older suburban neighborhoods, however. Read on to find out how to grow a sycamore tree.[图片]Growing Sycamore Trees Sycamore trees grow in almost any soil, but they prefer deep, rich soil that is moist but well-drained. Plant container-grown trees any time of year. Trees with balled and burlapped roots should be planted in spring or fall. Sycamore tree care is easy. Fertilize the tree every other year if it isn’t growing as fast as it should or the leaves are pale. Water young trees deeply to keep the soil from drying out. After the first couple of years, the tree withstands moderate drought. It’s best to give the soil a deep soaking when you’ve gone a month or so without a drenching rain.[图片]Problems with Sycamore Trees Many problems are associated with sycamore trees. It’s fairly messy, shedding a generous supply of leaves, seed balls, twigs and strips of bark. The tiny hairs on the seed balls irritate skin and can cause respiratory distress if inhaled by sensitive people. Wear a mask or respirator and gloves when removing the seeds from a seed ball. The leaves and leaf stems also have a coating of hair when they are new. The hairs shed in spring and can irritate eyes, respiratory track and skin.[图片]A sycamore’s spreading roots often infiltrate water and sewer lines and damage sidewalks and paved areas. The trees are susceptible to several insect infestations and fungal diseases. These conditions rarely kill the tree, but often leave it looking bedraggled by the end of the season.

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2017年09月02日

Tall, fast growing and durable, the sycamore tree—with its large, maple-like leaves—is an elegant addition to your backyard landscape. Its most recognizable feature is its bark that peels away as the trunk expands, revealing the white, tan and green inner bark. However, it is possible that you experience problems with sycamore trees. These can range from sycamore tree pests to sycamore tree diseases. Read on for information on sycamore tree problems.[图片]Avoiding Problems with Sycamore Trees Sycamore trees are vulnerable to diseases and insect pests, just like almost every variety of tree you can plant. Experts advise that you keep your tree healthy, with good cultural practices, as a first line of defense against problems with sycamore trees. Generally, the healthier and more vital the tree, the less it will experience sycamore tree problems. However, even well placed, irrigated and fertilized sycamore trees can get some pests and diseases.[图片]Sycamore Tree Pests One of the most common sycamore tree pests is the sycamore lace bug that gets its name from the lacy pattern on the adult’s wings, head, and chest. The insects feed on the undersides of the sycamore’s leaves. While the sycamore lace bug’s damage is rarely serious, a heavy infestation can slow the tree’s growth. Keep an eye on your tree leaves and wash off bugs with the hose. Insecticides are also available.[图片]Diseases of Sycamore Trees You’ll find that there are quite a few diseases of sycamore trees. The most dangerous of the diseases of sycamore trees is anthracnose, also called leaf and twig blight. It can kill American sycamore, although it does only minor damage to other varieties. This disease can kill twig tips, expanding to buds, new shoots and leaves. The symptom you see most frequently is crinkling and browning of the leaves. This sycamore tree disease is most likely to strike when the weather is cool and wet. Spores from the fungus can be spread by rain and wind. If you give your trees sufficient water and fertilizer, you are unlikely to see this sycamore tree disease.[图片]Another common disease of sycamore trees include powdery mildew fungus. It can be treated with fungicides. Bacterial leaf scorch can also be a problem. It is caused by Xylella fastidiosa, a bacterial pathogen that kills off entire branches of the tree. Pruning infected branches can slow its spread.

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2017年09月02日

Sweet thorn is an attractive and fragrant tree native to southern parts of Africa. Read on to find out more about this lovely landscape tree that grows well under the most difficult Southwestern conditions.[图片]Sweet Thorn Information In their native South Africa, Acacia karoo trees are beneficial wildlife trees. Birds nest in them, and the flowers attract insects to feed the birds. Ten species of butterflies depend on the Acacia sweet thorn for their survival. The sweet gum that oozes from wounds in the bark is a favorite food of many species of wildlife, including the lesser bushbaby and monkeys. Despite the thorns, giraffes love to eat their leaves. Growers in Africa sell the gum as a gum arabic substitute and use the beans as goat and cattle forage. As a legume, the tree can fix nitrogen and improve the soil. It is often used to help restore ruined mine land and other degraded soil. The leaves, bark, gum and roots are used in a wide range of traditional remedies.[图片]Growing Acacia Karroo Trees Sweet thorns (Acacia karroo) are highly ornamental plants that you can grow as a multi-stemmed shrub, or prune to a tree with a single trunk. The plant grows 6 to 12 feet tall with a similar spread. In spring, the tree blooms with an abundance of fragrant, yellow flower clusters that resemble pompoms. The loose canopy allows dappled sunlight through so that grass can grow right up to the trunk. Sweet thorns make attractive specimens, and you can also grow them in containers. They look good on patios and decks, but they produce fierce thorns, so plant them where they won’t come in direct contact with people. A row of closely planted sweet thorn shrubs makes an impenetrable hedge. The trees are useful in helping to control erosion, and they grow well in poor, dry soil. Sweet thorns are hardy in U.S. Department of Agriculture plant hardiness zones 9 through 11.[图片]Sweet Thorn Plant Care Sweet thorn trees grow well in any soil as long as it is well-drained. It thrives in dry, arid soils found in the Southwestern U.S. Since it is a legume that can fix nitrogen, it doesn’t need nitrogen fertilizer. For the best growth, water newly planted trees regularly until they are established and growing. It helps to water the tree monthly during extended periods of drought, but under normal conditions, it doesn’t need supplemental irrigation.[图片]If you want to grow the plant as a single-stemmed tree, prune it to a single trunk while it is young. Other than pruning, the only maintenance a sweet thorn tree needs is cleanup. It drops hundreds of 5-inch, brown seed pods in the fall.

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2017年09月02日

Everyone knows what a tree is and what a strawberry is, but what is a strawberry tree? According to strawberry tree information, this is a lovely little evergreen ornamental, offering lovely flowers and strawberry-like fruit. Read on for tips on how to grow a strawberry tree and its care.[图片]What is a Strawberry Tree? The strawberry tree (Arbutus unedo) is a charming shrub or small tree that is extremely decorative in your garden. It’s a relative of the madrone tree, and even shares the same common name in some regions. You can grow this plant as a multi-trunked shrub in a hedge, or prune it down to one trunk and grow it as a specimen tree.[图片]Growing Strawberry Trees If you start growing strawberry trees, you’ll find that they have many delightful features. The shedding bark on trunks and branches is attractive. It’s a deep, reddish brown and becomes gnarled as the trees age. The leaves are oval with a serrate edge. They are a shiny dark green, while the petiole stems attaching them to the branches are bright red. The tree produces abundant bunches of tiny white blossoms. They hang like bells at the branch tips and, when pollinated by bees, they produce strawberry-like fruit the following year.[图片]Both flowers and fruits are attractive and ornamental. Unfortunately, strawberry tree information suggests that the fruit, while edible, is quite bland and tastes more like pear than berry. So don’t start growing strawberry trees expecting real strawberries. On the other hand, taste the fruit to see if you like it. Wait until it is ripe and falls from the tree. Alternatively, pick it off the tree when it gets a little squishy.[图片]How to Grow a Strawberry Tree You’ll do best growing strawberry trees in USDA zones 8b through 11. Plant the trees in full sun or partial sun, but be sure you find a site with well-draining soil. Either sand or loam works well. It grows in either acidic or alkaline soil. Strawberry tree care involves regular irrigation, especially the first few years after planting. The tree is reasonably drought tolerant after establishment, and you don’t have to worry about its root breaking up sewers or cement.

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2017年09月02日

Norway spruce (Picea abies) is a tough conifer that makes for an easy-care landscape tree in US Department of Agriculture plant hardiness zones 3 through 7. It is also planted extensively for forest restoration and windbreaks. Planting a Norway spruce is easy because it competes well with grass and weeds and requires no site preparation. Read on for more information about care of Norway spruce trees.[图片]Norway Spruce Tree Info The Norway spruce tree is native to Europe. However, for over a century it has been planted in this country for both ornamental and utilitarian purposes. The tree roots are strong and the trees can withstand high winds, making them excellent windbreaks. The trees bear stiff evergreen needles up to an inch long, colored a shiny forest green. The bark is a red-brown and furrowed. The seed cones are large, and can grow 6 inches long. They mature in fall. Norway Spruce Growth Norway spruce growth is exceptional. The trees grow relatively fast – up to 2 feet a year – and their crowns develop a pyramid shape. The branches may drupe slightly at the tips, giving the trees a graceful allure. If you are thinking of planting a Norway spruce tree, it is important to understand that the tree can reach 100 feet or more in the wild and live for centuries. Although the tree stays shorter when cultivated, homeowners often underestimate the space the tree takes when mature.[图片]Planting a Norway Spruce Tree The more Norway spruce tree info you have, the more you will see that planting a Norway spruce tree is a good idea. The tree has many good attributes. First, you won’t need to clear out grasses or work the land to prepare a site for planting a Norway spruce tree. This spruce competes against grasses and weeds, and wins. In addition, the tree is drought tolerant. As a conifer, it can go into shut-down mode when irrigation is lacking. At the same time, it is one evergreen that tolerates wet soil. Plant it in marshy soil and it will thrive. You can plant Norway spruce in sun, shade or partial shade and it grows just the same. It is tolerant of poor soil but also grows in rich, fertile soils. Pest resistant, the trees hardly ever fall victim to insect damage or disease. Deer and rodents leave Norway spruce alone.[图片]Care of Norway Spruce Trees Required Norway spruce care is minimal. If you plant the tree with sufficient elbow room, you may not have to lift a finger other than providing an occasional drink during dry periods. Unlike many trees, the Norway spruce does not produce suckers. Because of this, the tree is not invasive. Digging out suckers is not part of Norway spruce care.

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2017年09月02日

The white spruce (Picea glauca) is one of the most widely growing coniferous trees in North America, with a range all across the eastern United States and Canada, all the way to South Dakota where it is the state tree. It is one of the most popular Christmas tree choices too. It’s very hardy and easy to grow. Keep reading to learn more white spruce information, including tips on growing white spruce trees and white spruce tree uses.[图片]White Spruce Information The most common of white spruce tree uses is Christmas tree farming. Because of their short, stiff needles and evenly spaced branches, they are perfect for ornament hanging. Beyond that, white spruce trees in landscapes are great as natural windbreaks, or in stands of mixed trees. If not cut down for Christmas, the trees will naturally reach a height of 40 to 60 feet with a spread of 10 to 20 feet. The trees are very attractive, keeping their needles all year long and naturally forming a pyramidal shape all the way down to the ground. They are an important shelter and food source for native North American wildlife.[图片]Growing White Spruce Trees Growing white spruce trees in the landscape is very easy and forgiving, as long as your climate is right. The trees are hardy in USDA zones 2 through 6, and are very tough against cold winter weather and wind. They prefer full sun and do best with at least 6 hours of direct sunlight per day, but they are also very tolerant of shade.[图片]They like soil that is slightly acidic and moist but well draining. These trees grow best in loam but will do well in sand and even well-drained clay. They can be started both from seeds and cuttings, and saplings transplant very easily.

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2017年09月02日

Eve’s necklace (Sophora affinis) is a small tree or a large bush with fruit pods that look like a beaded necklace. Native to the American South, Eve’s necklace is related to Texas mountain laurel. Read on for more information about growing necklace trees.[图片]What is a Necklace Tree? If you’ve never seen this tree before, you may ask: “What is a necklace tree?” When you study Eve’s necklace tree information, you find that it is a deciduous tree that grows in a rounded or vase shape and rarely rises above 25 feet tall. The necklace tree has dark, lustrous green leaves that appear in springtime. The flower buds also appear on the tree in spring and open into showy while blossoms tinged with rosy pink that dangle from the plant in clusters like wisteria. They are fragrant and stay on the tree most of the spring, from March through May.[图片]As summer wanes, the flowers give way to long, black, segmented fruit pods. The pods are constricted between the seeds so that they look like bead necklaces. The seeds and flowers are poisonous to humans and should never be consumed. This tree benefits native wildlife. Eve’s necklace flowers attract bees and other nectar-loving insects, and birds build nests in its branches.[图片]Eve’s Necklace Tree Information Growing necklace trees is not difficult. The trees are extremely tolerant, thriving on any soil – sand, loam or clay – from acidic to alkaline. They grow in any exposure from full sun to full shade, accepts high temperatures and requires little water. These trees grow very fast. A necklace tree can shoot up 36 inches in one season and to six feet in three years. Its spreading branches do not droop, nor do they break easily. The roots won’t damage your foundation either.[图片]How to Grow Eve’s Necklace Trees Grow Eve’s necklace in relatively warm regions like those found in U.S. Department of Agriculture plant hardiness zones 7 through 10. It is most attractive when grown as a specimen tree with lots of room to expand to 20 feet wide. You can grow this tree from its seeds. Wait until the pods dry and the seeds turn red before collecting them. Scarify them and soak them overnight in water before sowing.

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