动态第839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

Hemlock trees are a popular conifer that is commonly used as either privacy shrubs or as visual anchor trees in the landscape. Most of the time, pruning hemlocks is not necessary, but occasionally weather damage, disease or competing main trunks on upright hemlocks can create the need for pruning hemlocks. Keep reading to learn how and when to prune hemlocks.[图片]When to Prune Hemlocks If you find that you need to prune your hemlock tree, the best time for trimming hemlocks is in either spring or early summer. At this time, the tree is getting ready for or is already in active growth and will recover quickly from any hemlock pruning that needs to be done. In the fall and winter, hemlocks are preparing to go dormant and are hardening themselves to be able to withstand the cold of winter. Pruning hemlock trees in fall or winter can confuse the tree, causing it to return to active growth rather than dormancy. At best, the new growth it does produce will be killed off in the cold and, at worst, the entire tree will be unable to withstand the winter cold and the entire tree will die.[图片]How to Prune Hemlock Trees Trimming Hemlock to Correct Damage from Weather or Disease High winds or heavy snows can sometimes damage the branches of a hemlock and you may need to prune the tree in order to remove some of the damage or to help reshape the hemlock. Disease may also kill back some of the branches on the tree and you will need to remove the diseased branches. The first step in pruning hemlocks is use a clean, sharp pair of pruning shears or pruning saw, depending on the size of the branches you need to prune. Clean and sharp pruning tools will help to prevent disease.[图片]The next step in trimming hemlock branches is to select which branches need to be removed. Select the branches before you start trimming so that you do not over prune the tree accidentally. Then make your pruning cuts just above the needle whorls. Hemlock trees will grow new branches from the needle wholes and pruning just above them will ensure that the new branches come in properly. If damage to the hemlock tree is extensive, severe pruning may be needed. Hemlock trees can withstand severe pruning and will recover from losing as much as 50% of its branches.[图片]Pruning Hemlocks to Remove Competing Main Trunks Upright hemlock varieties look best when they have only one main trunks, so home owners often want to remove secondary upright trunks that may start to grow. These secondary trunks can be pruned back to their starting point on the main trunk or can be cut at any point along the trunk to stop its upward growth and encourage side growth instead.

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2017年08月31日

Hemlock woolly adelgids are small insects that can seriously damage or even kill hemlock trees. Is your tree at risk? Find out about hemlock woolly adelgid treatment and prevention in this article.[图片]What are Woolly Adelgids? Only about a sixteenth of an inch long, woolly adelgids (Adelges tsugae) have a huge impact on hemlock trees in the eastern part of North America. Their feeding practices cause needles and branches to brown and die, and if the infestation is left untreated, the tree starves to death. Here are some interesting facts about these tiny pests: All woolly adelgids are female. They reproduce asexually. As they feed, they secrete waxy filaments that eventually cover their bodies. These filaments give them their “woolly” appearance. The woolly coat protects the insects and their eggs from predators. Woolly adelgids sleep through the summer and are active when temperatures cool.[图片]Hemlock Woolly Adelgid Damage The woolly adelgid is an aphid-like insect that can grow and reproduce on all types of hemlocks, but only the eastern and Carolina hemlocks decline and die from an infestation. Watch closely for hemlock woolly adelgid damage. Early detection gives your tree a much better chance of survival.[图片]The insects feed by sucking sap from hemlock needles, and the needles die one by one. If nothing is done to stop the infestation, the entire branch may die. Here is a season-by-season list of danger signs: In spring, you may see orange-brown eggs when you look closely at the base of the needles. In early summer, the eggs hatch and upon close inspection you may be able to see tiny, reddish-brown, crawling insects. Summer is the easiest time to spot the insects. They go dormant during the heat of summer, but first they spin little white nests of a waxy, wooly-looking substance. The nests are much easier to see than the insects themselves. Woolly adelgids come out and begin feeding again in fall and winter.[图片]Woolly Adelgid Control The best treatment of woolly adelgids on a small tree is to spray the tree with horticultural oils. Spray in spring after the eggs hatch but while the insects are still crawling, and follow the label instructions. This method won’t work on large trees. They should be treated with a systemic insecticide by injection or soil treatment. These are short-term solutions.[图片]The treatment must be repeated every year. There are no good organic treatment methods, but scientists are working with some of the woolly adelgid’s natural enemies to see if they can be used to protect hemlock trees.

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2017年08月31日

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2017年08月31日

Weeping hemlock (Tsuga canadensis ‘Pendula’), also known as Canadian hemlock, is an attractive evergreen tree with a graceful, weeping form. Read on to learn about planting a weeping hemlock in your garden.[图片]Weeping Hemlock Growing There are a number of weeping hemlock varieties available to gardeners, all known collectively as ‘Pendula.’ Sargent’s hemlock (‘Sargentii’) is one of the most popular. Others include ‘Bennett’ and ‘White Gentsch.’ A moderate grower, weeping hemlock reaches mature heights of about 10 to 15 feet, with a width of up to 30 feet, depending on how the tree is pruned. Weeping hemlock displays spreading branches and dense foliage with a delicate, lacy texture, but there’s nothing fragile about weeping hemlock trees, which grow in USDA plant hardiness zones 4 through 8. Weeping hemlock trees thrive in partial or full sunlight. Full shade produces a thin, unattractive plant. Weeping hemlock also needs average, well-drained, slightly acidic soil. It prefers moist conditions and doesn’t do well in dry soil or extremely hot weather. Also, plant weeping hemlock where the tree is protected from harsh winds.[图片]Weeping Hemlock Tree Care Water weeping hemlock trees regularly, especially in hot, dry weather because weeping hemlock is intolerant of drought. Water is especially important for young, newly planted trees and helps develop a long, sturdy root system. Prune weeping hemlock trees as needed in late winter or early spring to control size or maintain a desired shape. Feed weeping hemlock trees before new growth appears in spring, using a good quality, general-purpose fertilizer. Apply fertilizer according to label recommendations.[图片]Treat aphids, scaleand spider mites with insecticidal soap spray. Repeat as needed. Don’t spray insecticidal soap if ladybugsor other beneficial insects are present on the leaves. Also, postpone spraying if temperatures are over 90 F. (32 C.), or if the sun is shining directly on the leaves.

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2017年08月31日

Hemlock trees are the Ferraris of the evergreen world — these graceful, drooping trees and shrubs are gorgeous additions to the landscape, but require very exacting conditions to do well. Like other beautiful and delicate things, if you can get hemlocks to thrive in your landscape, you’ll be the envy of your neighbors; but a hemlock in poor health will only make your home look sad and worn out. If you’re considering planting a hemlock in your yard as a specimen tree or for a unique hedge, read on to learn more about hemlock tree care.[图片]Landscaping With Hemlocks Growing hemlock trees is a piece of cake, provided that you take their many needs into consideration when planting them. The question isn’t so much how to plant a hemlock tree as where to plant them. Unlike many other large landscape trees, hemlocks have evolved while growing in the shade of other trees, so you’ll need to choose a place that’s protected, especially against winter winds and drying summer heat. Hemlocks can tolerate a wide range of lighting conditions, but won’t tolerate dry or compacted soils at all. Although there are many hemlocks to choose between for gardeners in USDA plant hardiness zones 3 through 7, many cultivars only do well in a smaller part of that range, so read the nursery tag carefully before bringing your hemlock home.[图片]Care of Hemlock Trees Once established, hemlocks require little care, but establishing them can be a challenge. They need acidic soils that stay moist, but not wet, and frequent waterings. Like willows, hemlocks are riverbank trees, so if your site is elevated and dry, you may need to add a thick ring of mulch over your tree’s root zone and consider installing a drip irrigation system to keep your tree looking its best. The shallow roots of the hemlock can allow it to topple easily; if high winds are a frequent problem, a stabilizing tree stake should be considered while your hemlock is young.[图片]Although the hemlock isn’t bothered by pests or diseases as a rule, they do have one pest that seems to find them wherever they go. The hemlock wooly adelgid is a small, aphid-like insect that hides inside a woolly sac — the most notorious and troublesome pest of hemlocks. Regular inspections of your hemlock will help prevent serious damage from this pest, provided you check for them at least once a year. October is the best time to treat these pests, using either insecticidal soap or horticultural oil. Imidacloprid is sometimes used as a yearly treatment where adelgids are a constant threat.[图片]Occasional pruning of hemlock trees may be necessary when weather related issues or other damage is present.

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2017年08月31日

So, what is a hackberry and why would one want to grow it in the landscape? Keep reading to learn more about this interesting tree.[图片]What is a Hackberry Tree? A hackberry is a medium sized tree indigenous to North Dakota but able to survive throughout most of the United States. Hackberry is an easy to identify member of the Elm family but in a different genus (Celtis occidentalis). It has a distinctive warty bark surface sometimes described as stucco-like. It has 2 to 5-inch long, alternate leaves with unequal bases and tapered ends. The leaves are dull green to glossy with a network of veining and serrated except at their base.[图片]Hackberry Tree Info Hackberry trees also bear ¼-inch sized, dark purple pitted fruit (drupes) that are valuable food sources through the late winter months for a variety of bird species including flickers, cardinals, cedar waxwings, robins and brown thrashers. Of course, in the yin and yang of things, this attraction has a detriment as well since small mammals and deer may damage the tree when browsing.[图片]Patience does not necessarily need to be a virtue when hackberry growing; the tree matures rapidly, attaining heights of 40 to 60 feet at the crown and 25 to 45 feet across. Above the gray ridged barked trunk, the tree broadens and arches out from the top as it matures. The wood of the hackberry tree is used for boxes, crates and firewood, so not necessarily a wood for finely crafted furniture. The Native Americans once used the fruit of the hackberry to flavor meats much as we use pepper today.[图片]How to Grow Hackberry Trees Grow this medium to tall tree on farms as field windbreaks, riparian planting or along highways in beautification projects – as it does well in dry and windy areas. The tree also enlivens boulevards, parks and other ornamental landscapes. Other hackberry tree info tells us that the specimen is hardy in USDA zones 2-9, which covers a good bit of the United States. This tree is moderately drought hardy but will do best on moist but well draining sites. When hackberry growing, the tree thrives in most any type of soil with a pH of between 6.0 and 8.0; it is also able to withstand more alkaline soils.[图片]Hackberry trees should be planted in full sun to partial shade. It truly is quite an adaptable species of tree and requires little care.

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2017年08月31日

If you aren’t a resident of the southeastern United States, then you may have never heard of sugar hackberry trees. Also referred to as sugarberry or southern hackberry, what is a sugarberry tree? Keep reading to find out and learn some interesting sugar hackberry facts.[图片]What is a Sugarberry Tree? Native to the southeastern United States, sugar hackberry trees (Celtis laevigata) can be found growing along streams and flood plains. Although usually found in moist to wet soils, the tree adapts well to dry conditions. This medium to large deciduous tree grows to around 60-80 feet in height with upright branching and a rounded spreading crown. With a relatively short life, less than 150 years, sugarberry is covered with light gray bark that is either smooth or slightly corky. In fact, its species name (laevigata) means smooth. Young branches are covered with tiny hairs that eventually become smooth. The leaves are 2-4 inches long and 1-2 inches wide and mildly serrated. These lance-shaped leaves are pale green on both surfaces with obvious veining.[图片]In the spring, from April through May, sugar hackberry trees flower with insignificant greenish blooms. Females are solitary and male flowers are borne in clusters. Female blossoms become sugar hackberry fruit, in the form of berry-like drupes. Each drupe contains one round brown seed surrounded by sweet flesh. These deep purple drupes are a great favorite of many species of wildlife.[图片]Sugar Hackberry Facts Sugar hackberry is a southern version of common or northern hackberry (C. occidentalis) but differs from its northern cousin in several ways. First, the bark is less corky, whereas its northern counterpart exhibits distinctive warty bark. The leaves are narrower, it has a better resistance to witches’ broom, and is less winter hardy. Also, sugar hackberry fruit is juicier and sweeter. Speaking of the fruit, is sugarberry edible? Sugarberry was commonly used by many Native American tribes. The Comanche beat the fruit to a pulp and then mixed it with animal fat, rolled it into balls and roasted it in the fire. The resulting balls had a long shelf life and became nutritious food reserves.[图片]Native people also had other uses for sugarberry fruit. The Houma used a decoction of bark and ground up shells to treat venereal disease, and a concentrate made from its bark was used to treat sore throats. The Navajo used leaves and branches, boiled down, to make a dark brown or red dye for wool. Some people still pick and use the fruit. Mature fruit can be picked from late summer until winter. It can then be air dried or soak the fruit overnight and rub the exterior off on a screen.[图片]Sugarberry can be propagated via seed or cuttings. Seed must be stratified prior to use. Store wet seeds in a sealed container in the refrigerator at 41 degrees F. (5 C.) for 60-90 days. The stratified seed can then be sown in the spring or non-stratified seeds in the fall.

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2017年08月31日

Just what are Ginkgo biloba benefits, what is ginkgo and how can one grow these useful trees? Read on for the answers to these questions and tips for growing ginkgo trees.[图片]Gingko trees are deciduous, hardy shade trees with unique fan-shaped leaves which are linked to a primitive family of trees commonly found 160 million years ago in China. Considered to be the world’s oldest living species of tree, geological evidence of ginkgos have been dated to the Mesozoic era, some 200 million years ago! Ginkgo trees are planted around temple sites in Japan and considered to be sacred. These trees produce an herbal product popular around the world, most specifically in Asian cultures.[图片]Ginkgo Biloba Benefits The ancient medicinal by-product resulting from ginkgo trees is derived from the seeds of the tree. Long touted for its benefits in improving memory/concentration (Alzheimer’s disease and dementia), Ginkgo biloba purported benefits also include relief from PMS symptoms, eye problems like macular degeneration, dizziness, leg pains associated with circulation issues, Tinnitus, and even MS symptoms. Ginkgo biloba is not regulated or sanctioned by the FDA and is listed as an herbal product. A note on Ginkgo trees seeds: avoid products that contain fresh or roasted seeds as they contain a toxic chemical which can result in seizures or even death.[图片]How to Grow a Ginkgo Tree Also called the maidenhair tree, ginkgo trees are long living, drought and pest resistant, and incredibly strong; so strong in fact, they were the only trees to survive following the Hiroshima atomic bomb attack. These trees may grow to a height of 80 feet; however, they are slow growers and as such will work well in many garden areas within USDA zones 4-9. Ginkgos have a gorgeous yellow fall color and have a spreading habitat which varies dependent upon the cultivar. Autumn Gold is a male cultivar with good fall color and both Fastigiata and Princeton Sentry® are columnar male forms. Male forms of gingko trees are mentioned, as the fruiting females tend to have an incredibly nasty odor described by many as smelling of, well, vomit. Hence, it is recommended that one plants only male trees.[图片]Tips for Growing Ginkgo Ginkgo trees are multi-purpose in their uses as they make wonderful shade trees, specimen plants (including amazing bonsai) and street trees. As street trees, they are tolerant of city conditions such as air pollution and road salt. Although they may need to be staked when saplings, once they have attained some size, staking is no longer required and the trees may also be transplanted with great ease and no fuss. As the tree is amazingly easy going about almost everything, including the pH of its soil, gingko tree care does not require a lot of finesse. When planting, ginkgo tree care will include setting in deep, well-draining soil in an area of full to partial sun.[图片]Regular watering and a well balanced fertilizer regime is also recommended, at least until maturation — about the time it reaches 35 to 50 feet tall! Seriously though, gingko tree care is a simple process and will result in many years of shade from this ornamental botanical “dinosaur.”

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2017年08月31日

In early spring, just as the dogwood blossoms begin to fade, the delightful, fragrant flowers of the fringe tree burst into bloom. Fringe trees are outstanding landscape trees with many features to recommend them. Want to know more? You’ll find all the fringe tree information you need in this article.[图片]What is a Fringe Tree? Native to the southeastern U.S., Chionanthus virginicus can grow anywhere in the country except for the southernmost tip of Florida. Its botanical name means snow flower and refers to the tree’s large clusters of snow white flowers. There is also a Chinese fringe tree, C. retusus, which is very similar to the native species but has smaller flower clusters. It hasn’t yet proven itself to be invasive, but as with all imported species, there is always a chance that problems may arise.[图片]Although you may find fringe trees growing naturally in moist woods and on streambanks and hillsides, you probably won’t be able to bring one home to plant in your garden, as they don’t transplant well. Fringe trees grow only 10 to 20 feet tall, so they fit in almost any garden. Use them in groupings, in shrub borders, or as specimens. They look spectacular when in bloom, and the large white flowers are followed by hanging blue or purple berries that bring birds and other wildlife to the garden. In summer you’ll enjoy a neat, oval-shaped canopy of dark green leaves. The fruit and flowers don’t leave behind a mess to clean up, making fringe tree care simple.[图片]You don’t have to worry about planting a fringe tree under power lines. Their short stature means they won’t interfere with the lines. The trees tolerate urban conditions, including air pollution, but they won’t tolerate street salts or dry, compacted soil. The branches are strong and withstand all kinds of wind and weather, but the flowers are more delicate, and if you want them to last, plant the tree in a sheltered location.[图片]Caring for Fringe Trees For best results, plant fringe trees in moist, well-drained soil in full sun or partial shade. As with most flowering trees, more sun means more flowers. Dig the planting hole as deep as the root ball and two to three times as wide. After you place the tree in the hole, backfill with the soil you removed from the hole without additives or enhancements. Water thoroughly when the hole is half full of soil and again when it is completely full, tamping down to remove air pockets.[图片]The tree won’t withstand prolonged drought. Water before the soil around the roots has a chance to dry completely at root depth. Unless the soil fertility is naturally moderate to high, fertilize annually with about an inch of compost or use a complete and balanced fertilizer according to the label instructions. The sturdy branches of a fringe tree seldom need pruning. The canopy develops a naturally tight, oval shape.

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2017年08月31日

The foxtail palm tree (Wodyetia bifurcata), an Australian native, is an adaptable, fast-growing specimen. In recent years, varieties of foxtail palm trees have become popular with landscapers and nurserymen in warmer zones of the United States. Grown in a wide range of soils, the only requirements are that soil be well draining and not highly acidic. Tolerant of salty sea spray and wind, the foxtail palm tree is an excellent choice for those who live on ocean fronts and other salt prone areas. Let’s take a look at how to grow foxtail palms in your garden.[图片]How to Grow Foxtail Palms From Seed Easily started from seed, the foxtail palm tree is suitable for container growing and may be used as an interior planting if correct growing conditions exist. Containers must be large enough to accommodate the large root system. Seeds may be started in small containers and transplanted when germination occurs. The attractive foxtail palm tree grows most rapidly in a full sun area, but may thrive in partially shaded areas as well. The foxtail palm tree prefers a humid environment which may be provided by nearby fountains or pebble trays in the immediate area where it is grown.[图片]Seeds started in pots should be kept moist until germination occurs. Germination may occur as quickly as one month or take up to one year, but is most often accomplished within a three month time frame. Well drained soil and adequate watering, combined with appropriate fertilization ensure a low care beauty wherever it may be planted.[图片]How to Take Care of Foxtail Palms Easy maintenance is associated with the foxtail palm tree, as it is a self-cleaning specimen; meaning that spent leaves will die and drop from the tree as needed to facilitate new growth. While the foxtail palm tree is somewhat drought resistant, regular watering encourages optimum growth and a lush, exotic appearance. Regular watering is required until the tree is established, usually in one or two years. Caring for foxtail palms should include mulching, but mulch should not hug the trunk. Mulching helps retain moisture and discourages maintenance workers from accidentally injuring the trunk with mowers and trimmers. It also keeps weed growth down in the area of the foxtail palm tree.[图片]Foxtail Palm Fertilizer When feeding the foxtail palm tree, fertilizer should be heavy on nitrogen, which encourages lush green foliage growth. Foxtail palm fertilizer should be balanced and also contain micronutrients and trace elements. Controlled release fertilizer is preferable to rapid release, water soluble fertilizer, as the latter moves through the soil too quickly to benefit the deep and spreading root system. In areas where manganese toxicity may exist in the soil, such as some areas of Hawaii, a low pH may be corrected with the application of limestone. Foxtail palm fertilizer may be the pellet form and should be broadcast in the area under the tree’s canopy, taking care not to dump large amounts on newly forming roots which may burn. Avoid fertilizing against the trunk area.[图片]Once they are properly located, caring for foxtail palms is relatively simple. Once you grow these specimens you will quickly learn how to take care of the foxtail palm. Through experience and experimentation you will determine which foxtail palm fertilizer is best for your conditions and which varieties of foxtail palm trees you prefer to grow.

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