动态第824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03日

Native to northern climates, paper birch trees are lovely additions to rural landscapes. Their narrow canopy produces dappled shade that makes it possible to grow these trees in a sea of groundcover plants such as wintergreen and barberry, and you can even grow grass under them. Unfortunately, paper birches don’t fare well in the city where they struggle to survive in the face of pollution, heat and dry conditions. Although they love cool climates, the branches break easily on windy days, especially when weighted down with snow and ice. Despite these drawbacks, they are well worth growing for their beautiful bark that shines against a dark background.[图片]What Is a Paper Birch Tree? Paper birch trees (Betula papyriferia), also called canoe birches, are native to moist stream banks and lakesides in Northeastern United States and Canada. They have a single trunk, but nurseries like to grow them in clumps of three and call them “clumping birches.” The lowest branches are just a few feet off the ground, and in fall the foliage turns a blazing shade of yellow. Growing paper birch trees means you’ll always have something interesting to look at in the landscape.[图片]Paper Birch Tree Facts Paper birch trees grow as much as 60 feet tall and 35 feet wide, adding as much as 2 feet per year in USDA plant hardiness zones 2 to 6 or 7 where winters are cold. The tree’s most striking feature is its peeling white bark, which is highlighted with streaks of pink and black. In spring, it produces hanging clusters of catkins that are very attractive when in bloom. Most specimens have bright-colored fall foliage. Paper birch trees are a larval host for luna moth caterpillars. They also attract a number of birds, including yellow bellied sap suckers, black-capped chickadees, tree sparrows and pine siskins.[图片]Here are a few uses of paper birch in the landscape: Grow them in groups in moist beds and borders. Their thin canopy lets you grow other plants beneath them. Use paper birches to transition gradually from woods to open ground. Although the roots are shallow, they don’t usually rise above the surface of the soil, so you can use them as lawn or roadside trees. How to Care for a Paper Birch Tree Paper birches transplant easily with little shock. Plant them in a location with full sun and moist but well-drained soil. The trees adapt to most types of soil as long as it is cool in summer. It prefers long winters and mild summers. Paper birches are susceptible to a number of insects, including the destructive bronze birch borers. If you live in an area where these insects are a problem, try planting a resistant cultivar such as ‘Snowy.’[图片]You can also help the tree resist birch borers by fertilizing annually in spring and using organic mulch. It’s best not to prune a paper birch unless absolutely necessary because it attracts insects and the tree bleeds copious amounts of sap when cut.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

A weeping silver birch is a graceful beauty. Bright white bark and long, downward growing shoots at the ends of the branches create an effect unmatched by other landscape trees. Find out more about this lovely tree and weeping silver birch care in this article.[图片]What are Weeping Silver Brich Trees? Weeping silver birch (Betula pendula) is a European species that is well suited to North American locations with mild summers and cold winters. It isn’t a low-maintenance tree, but it well worth the time you put into it. Weeping silver birch growing conditions include full sun and well-drained, moist soil. The soil should never dry out. A thick layer of mulch around the base of the tree will help hold moisture in. Weeping silver birch trees grow best in areas where summer temperatures rarely exceed 75 degrees Fahrenheit (25 C.) and where the roots are covered with snow for most of the winter.[图片]Care of Weeping Silver Birch An important part of the care of weeping silver birch trees is keeping the soil evenly moist. If the soil in the area isn’t naturally moist, install drip irrigation under the mulch. The tree is susceptible to fungal diseases for which there is no cure, but you may be able to keep them at bay by pruning out diseased twigs and branches. Prune in late winter before the tree breaks dormancy. Pruning cuts bleed an abundance of sap if you wait until spring. Cut back to healthy wood. The cut will stimulate growth from the side shoots and nodes below it, so it’s best to cut just above a node or side shoot.[图片]If the long shoots make landscaping tasks, such as mowing, difficult, you can cut them back to the desired length. Always mow so that any sticks or debris caught by the mower blades will be thrown away from the tree instead of toward it to prevent trunk injuries. Injuries create entry points for insects and disease. Plant a weeping silver birch in an area where it is in scale with the rest of the landscape and where it has room to spread to its mature size. The tree will grow 40 to 50 feet tall, and will look awkward in a small yard. The canopy will spread 25 to 30 feet, and it should not be crowded by structures or other trees.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

Birch trees are highly desirable landscape trees because of their beautiful bark and graceful foliage. Unfortunately, they aren’t known for their long lifespan. You can improve their chances by pruning birch trees properly, and taking advantage of the best time to prune birch trees.[图片]Reasons for Cutting Back Birch Trees There are several reasons for cutting back birch trees: Remove dead, diseased and injured branches for the health of the tree. Branches that rub together offer entry points for insects and disease, so remove one of them. Branches that grow nearly straight up have weak attachments to the trunk. Take them down while they are small to prevent them from breaking off later on. Remove a branch that is too close to another branch. This is best done when the tree is young. Remove branches that are too close to the ground to make landscaping easier and allow comfortable use of the shade. You can remove any branch that detracts from the overall appearance of the tree.[图片]When to Prune Birch Trees Most landscapers prune trees just before they break dormancy in late winter or early spring, but this timing doesn’t work for birch trees. They bleed a heavy flow of sap if pruned when awakening from their winter rest, so the best time to prune birch trees is late summer or early autumn. When you prune at the proper time, you not only avoid sap flows, but you also avoid the egg laying season for most insects that infest pruning wounds. These insects cause unsightly damage, and they can spread serious diseases. Birch tree borers are tree killers, and you should reduce the risk of attack by cutting after their early summer flying season whenever possible.[图片]How to Prune a Birch Tree There are several steps in pruning a birch tree. Take care of the easy stuff first by removing side shoots and suckers as necessary. Next, decide which branches to remove. Be as conservative as possible. Removing more than twenty-five percent of the canopy of a tree at one time weakens it and may be fatal. Never top a tree. Remove branches less than two inches in diameter as close as possible to the collar, or thickened area where the branch attaches to the trunk. Use one quick cut with long-handled pruners to remove the branch, and then clean the pruning tool with a ten percent bleach solution or a household disinfectant before moving to another branch.[图片]Larger branches are taken down with three cuts. Here’s the procedure: The Undercut – From the trunk of the tree, measure 18 inches out along the branch. At the 18-inch mark, make a cut one-third to one-half of the way through the branch beginning at the underside and working in an upward direction. This cut prevents the falling branch from stripping bark and wood from the tree as it falls. The Main Cut – Measure an inch or two out from the undercut and cut the branch from the top downward. Cut all the way through as smoothly as possible. Tidying Up – The 18- to 20-inch stub that remains is an unnecessary eyesore, and can cause disease if it dies back. It will not regrow, so cut it off flush with the collar.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

The river birch is a popular tree for river banks and wet parts of the garden. Its attractive bark is especially striking in the winter when the rest of the tree is bare. Keep reading to learn more river birch tree facts, such as river birch tree care and effectively using river birch trees in the landscape of your home.[图片]River Birch Tree Facts River birch trees (Betula nigra) are hardy in USDA zones 4 through 9. They are more heat tolerant than most of their birch relatives, making them a good choice in many parts of the southern U.S. They grow naturally in wet environments along river and stream banks, so they are used to very moist soil. They will tolerate soil that is acidic, neutral, or alkaline, as well as well or poorly drained. Though they do best in moist conditions, they tolerate drier soil better than other birch trees do. These trees prefer full sun but will tolerate partial shade. They tend to grow between 40 and 70 feet in height.[图片]Growing River Birch Trees in the Landscape In nature, you will most likely find a river birch tree growing near water. Because of its affinity for wet, heavy soil, planting a river birch tree can fill in spaces where nothing else seems to grow. If you have water on your property, consider lining it with river birch trees. If you don’t, planting a river birch tree or two in your yard will make for an attractive specimen and shade tree. Surround the tree with heavy mulch to help keep the roots wet and cool.[图片]River birch trees can be grown direct from seed or planted as saplings. When seeds or saplings are starting out, it’s important to control weed competition nearby either with weed fabric or select herbicidal spraying.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

If you tell your friends or neighbors that you are growing bee bee trees, you may get lots of questions. What is a bee bee tree? Do bees like bee bee tree plant flowers? Is bee bee tree invasive? Read on for answers to all these questions plus tips of growing bee bee trees.[图片]What is a Bee Bee Tree? The bee bee tree, also known as Korean evodia (Evodia daniellii syn. Tetradium daniellii), is not a well-known ornamental, but it should be. The tree is small, generally not much taller than 25 feet, and its dark green leaves provide light shade beneath. The bark is smooth, like beech tree bark. The species is dioecious, so there are male trees and female trees. In late spring or early summer, female bee bee trees grow a gorgeous display of fragrant, flat-topped flower clusters that last a long time. Bees love the flowers, and beekeepers love the bee bee tree plant’s long blooming season. On the female bee bee tree plants, the flowers ultimately give way to fruits in the form of capsules. Inside are purple, fleshy seeds.[图片]Bee Bee Tree Care If you are planning on growing bee bee trees, you’ll be glad to know that bee bee tree care is not difficult if you select an appropriate location. The tree thrives in moist, fertile soil that drains well, and does best in full sun. Like most trees, bee bee tree plants require regular irrigation for the first year after planting. This is an especially important aspect of bee bee tree care when the weather is dry. After establishment, the mature trees can tolerate some seasonal dryness. You’ll find that bee bee trees do not suffer from many diseases, nor are they attacked by insect pests. In fact, even deer tend not browse bee bee tree plants.[图片]Is Bee Bee Tree Invasive? The bee bee tree fruit produces many seeds. These seeds can propagate the species far and wide when spread by hungry birds, even naturalizing in the wild. Scientists do not know very much about this tree’s impact on the environment. Given its invasive possibilities in some circumstances, it is called a “watch list species.”

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

The large, white flowers of the baobab tree dangle from the branches on long stems. Huge, crinkled petals and a big cluster of stamen give baobab tree flowers an exotic, powder puff appearance. Find out more about baobabs and their unusual flowers in this article.[图片]About African Baobab Trees Native to the African Savannah, baobabs are best suited to warm climates. The trees are also grown in Australia and sometimes in large, open estates and parks in Florida and parts of the Caribbean. The tree’s overall appearance is unusual. The trunk, which can be 30 feet in diameter, contains a soft wood that is often attacked by a fungus and hollows it out. Once hollow, the tree can be used as a meeting place or dwelling. The interior of the tree has even been used as a jail in Australia. Baobabs can live for thousands of years.[图片]The branches are short, thick and twisted. African folklore holds that the unusual branch structure is the result of the tree’s constant complaining that it didn’t have many of the attractive features of other trees. The devil yanked the tree out of the ground and shoved it back in top first with its tangled roots exposed. Additionally, its strange and eerie appearance made the tree ideal for its starring role as the Tree of Life in the Disney film Lion King. Baobab flower blooming is another story altogether.[图片]Flowers of Baobab Tree You can think of an African baobab tree (Adansonia digitata) as a self-indulgent plant, with flowering patterns that suit itself, but not the desires of people. For one thing, baobab flowers are stinky. This, combined with their tendency to open only at night, make baobab flowers difficult for humans to enjoy. On the other hand, bats find baobab flower blooming cycles a perfect match for their lifestyle. These night-feeding mammals are attracted by the malodorous fragrance, and use this feature to find the African baobab trees so they can feed on the nectar produced by the flowers. In exchange for this nutritious treat, the bats serve the trees by pollinating the flowers.[图片]The flowers of the baobab tree are followed by large, gourd-like fruit that is covered with gray fur. The fruit’s appearance is said to resemble dead rats hanging by their tails. This has given rise to the nickname “dead rat tree.” The tree is also known as the “tree of life” for its nutritional benefits. People, as well as many animals, enjoy the starchy pulp, which tastes like gingerbread.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

Quaking aspen (Populus tremuloides) are lovely in the wild, and enjoy the most extensive native range of any tree on the continent. Their leaves have flattened petioles, so they tremble in every light breeze. You may have admired aspens lighting up park slopes with brilliant yellow fall color. But be sure to read up on quaking aspen tree facts before you plant them in your backyard. Cultivated aspens can be a problem to a homeowner. Read on for information about the pros and cons of planting a quaking aspen tree, and how to grow quaking aspen trees.[图片]Quaking Aspen Tree Facts Before planting a quaking aspen tree in your garden, you’ll need to understand the pros and cons of cultivated aspen trees. Some gardeners love them, some do not. Aspen trees grow very quickly and are very hardy. That means that you can “furnish” a new backyard in just a few seasons if you plant aspens. Aspens are small and won’t overwhelm your yard, and sometimes they provide nice autumn color.[图片]On the other hand, consider that the role of aspens in nature is as a “succession” tree. Its job in the wild is to spread quickly in eroded or burned out areas, providing cover for seedlings of forest trees like pine, fir and spruce. As the forest trees get bigger, the aspen die out. Quaking aspen tree facts establish that this succession tree spreads very fast in proper terrain. It grows fast from seeds, but also grows from suckers. Planting a quaking aspen tree can lead quickly to many quaking aspen weed trees invading your yard.[图片]How Big Do Quaking Aspens Get? If you are planting a quaking aspen tree, you may ask “how big do quaking aspens get?” They are generally small or medium trees, but can grow to 70 feet tall in the wild. Note that cultivated trees grown in soil unlike that in which the tree experiences in the wild may stay smaller than trees in nature. They also may drop their leaves in the fall without that brilliant yellow display you see in the parks.[图片]How to Grow Quaking Aspen Trees If you decide to go ahead with planting a quaking aspen tree, try to pick nursery-grown specimens rather than those taken from the wild. Nursery grown trees require less quaking aspen tree care and may avoid some of the disease issues the tree experiences in cultivation. A large part of quaking aspen tree care involves selecting an appropriate planting location. Plant the trees in moist, well-drained soil. The soil should be slightly acidic for the tree to thrive.[图片]Plant aspens on northern or eastern slopes, or northern or eastern sides of your house, rather than sunnier areas. They cannot tolerate drought or hot, dry soil.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

Aspen trees are a popular addition to landscapes in Canada and the northern parts of the United States. The trees are beautiful with white bark and leaves that turn a striking shade of yellow in the autumn, but they can be finicky in a few different ways. Keep reading to learn more aspen tree information, including how to care for aspen trees in landscapes.[图片]Aspen Tree Information One problem that many people come up against when growing aspen trees is their short lifespan. And it’s true – aspen trees in landscapes usually only live between 5 and 15 years. This is usually due to pests and diseases, which can be a real problem and sometimes have no treatment. If you notice your aspen becoming sick or infested, the best thing to do is often to cut the offending tree down. Don’t worry, you won’t be killing the tree. Aspens have large underground root systems that continually put up new suckers that will grow into large trunks if they have the space and the sunlight.[图片]In fact, if you see several aspens growing near each other, odds are good that they’re actually all parts of the same organism. These root systems are a fascinating element of the aspen tree. They allow the trees to survive forest fires and other aboveground problems. One aspen tree colony in Utah is thought to be over 80,000 years old. When you’re growing aspen trees in landscapes, however, you probably don’t want a colony that puts up new suckers all the time. The best way to prevent this spread is to surround your tree with a round metal sheet sunk 2 feet into the ground a few feet from the trunk. If your tree does fall to disease or pests, try cutting it down – you should see new suckers very soon.[图片]Common Aspen Tree Varieties Some of the more common aspen trees in landscapes include the following: Quaking aspen (Populus tremuloides) Korean aspen (Populus davidiana) Common/European aspen (Populus tremula) Japanese aspen (Populus sieboldii)

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

Arborvitae (Thuja) are one of the most versatile and attractive trees or shrubs found in the landscape. They are useful as hedge material, in pots or as interesting focal points for the garden. Planting an arborvitae hedge provides security and a beautiful screen. This easy to grow evergreen comes in a wide variety of sizes and colors, providing a solution for almost any landscape situation. Follow a few tips on how to grow an arborvitae and you will have a plant with superior growth habit and ease of care.[图片]Arborvitae Growing Conditions Arborvitae prefer moist, well-drained soil in full sun or even partial shade. Most zones of the United States provide ideal arborvitae growing conditions and they are hardy to USDA Zone 3. Check drainage before planting an arborvitae and add grit to a depth of 8 inches if your soil retains too much moisture. Arborvitae need soil ph levels of 6.0 to 8.0, which should have a good amount of organic material worked in to increase its structure and nutrient levels.[图片]When to Plant Arborvitae Most evergreen plants, such as arborvitae, are planted when they are not actively growing for best results. Depending where you live, they may be planted in late winter if soils are workable, or you may have to wait until early spring when the earth has thawed. Arborvitae are usually sold balled and burlapped, which means the root system is protected from harsh conditions and allows you to be more lenient on when to plant arborvitae than with bare-root trees. They can also be established in the ground in late fall if the base is covered with a thick layer of bark or organic mulch.[图片]How to Plant Arborvitae Trees Location and soil condition are the primary concerns regarding how to plant arborvitae trees. These scale-leaved evergreens have a broad, spreading root system, which tends to be near the surface. Dig the hole twice as wide and deep as the root ball to allow roots to spread as the tree becomes established. Water frequently for the first few months and then begin to taper off. Irrigate deeply when you do water and ensure that the plant doesn’t dry out in hot punishing summer weather.[图片]How to Grow Arborvitae Arborvitate are very tolerant plants that require no pruning and have naturally graceful pyramid shapes. While the plants are prey to few insects, they are prone to spider mite infestations during hot, dry weather. Deep watering and spraying off the foliage can minimize these pests’ presence. Apply a three inch layer of mulch around the base of the tree and fertilize in spring with a good all purpose landscape fertilizer.[图片]Novice gardeners will be particularly rewarded when planting an arborvitae, due to their low maintenance and uncomplaining growth patterns.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px

Dummer. ゛☀

2017年09月03日

Trees growing in the wild rely on the soil to provide the nutrients they need to grow. In a backyard environment, trees and shrubs compete for available nutrients and may require fertilizer to keep them healthy. Arborvitae are narrow-leaf evergreen trees with leaves that look like scales. Different arborvitae species grow into different shapes and sizes, making the tree an excellent choice for hedges of any height or specimen plants. Beloved for their fast growth, arborvitae – especially those planted near other trees or in hedges – often require fertilizer to thrive. It isn’t difficult to begin fertilizing arborvitae. Read on to learn how to fertilize an arborvitae and the type of fertilizer for arborvitae.[图片]Fertilizing Arborvitae Many mature trees do not require fertilizing. If your arborvitae is planted alone as a specimen tree and appears happy and thriving, consider skipping the fertilizer for the present time. If your trees are fighting for nutrients with other plants, they may need fertilizer. Check to see if they are growing slowly or otherwise look unhealthy. Before you fertilize, learn about the optimal type of fertilizer for these tough evergreens.[图片]What Type of Fertilizer for Arborvitae? If you want to start providing fertilizer for arborvitae trees, you need to select a fertilizer. You can select a single-nutrient fertilizer like nitrogen, but unless you are completely certain that your soil is rich in all other nutrients, it may be better to opt for a complete fertilizer for trees. Experts recommend slow release granular fertilizer for arborvitae trees. The nitrogen in this fertilizer is released over a long period of time. This enables you to fertilize less often and also ensures that the tree’s roots will not burn. Select a slow-release fertilizer that includes at least 50 percent nitrogen.[图片]How to Fertilize an Arborvitae? Applying fertilizer for arborvitae trees correctly is a matter of following easy directions. The fertilizer container will tell you how much of the product to use per tree. To fertilize your trees, broadcast the recommended amount of fertilizer evenly over the root zone. Keep the granules well away from the plant’s trunk area. Water the soil beneath the tree well when you are done fertilizing arborvitae. This helps the fertilizer dissolve so that it is accessible to the roots.[图片]When to Feed Arborvitae? It is also important to know when to feed arborvitae. Fertilizing arborvitae at the wrong time can lead to problems with the tree. You should fertilize your arborvitae during the growing season. Offer the first feeding just before new growth begins. Fertilize at the intervals recommended on the container. Stop fertilizing arborvitae one month before the first frost in your region.

...显示更多

0

文章

😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠

* 仅支持 .JPG .JPEG .PNG .GIF

* 图片尺寸不得小于300*300px