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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Ash yellows is a devastating disease of ash trees and related plants. It can infect lilacs as well. Find out how to recognize the disease and what you can do to prevent it in this article.
What is Ash Yellows? Ash yellows is a newly discovered plant disease, first detected in the 1980’s. It probably existed long before that, but wasn’t detected because the symptoms are so similar to those of other plant diseases. In many cases, you won’t be able to get a firm diagnosis without laboratory tests. A tiny, mycoplasma-like organism that we call the ash yellows phytoplasma causes the infection. A disease that infects members of the ash (Fraxinus) family, ash yellows only exists in North America. The symptoms are similar to those of environmental stress and opportunistic fungi. Although we see it most often in white and green ash trees, several other species of ash can also become infected.
Symptoms of Ash Yellows Ash yellows doesn’t discriminate about location. We find it in commercial woodlots, natural forests, home landscapes and urban plantings. Dieback may be rapid or very slow. Although it may be several years before the tree deteriorates to the point where it is unsightly or a danger to your landscaping and buildings, it’s best to remove it promptly to prevent the spread of disease. Replace it with trees that aren’t members of the ash family. It may be as long as three years after infection before the symptoms of ash yellows appear. An infected tree usually grows at about half the rate of a healthy tree. Leaves may be smaller, thinner, and pale in color. Infected trees often produce tufts of twigs or branches, called witches’ brooms.
There is no effective ash yellows disease treatment. The disease is spread from plant to plant by insects. The best course of action if you have a tree with ash yellows is to remove the tree to prevent the spread to other trees. Does this mean that you have to give up ash trees and lilacs in the landscape? If you know there is a problem with ash yellows in the area, don’t plant ash trees. You can plant lilacs as long as you choose common lilacs. Common lilacs and hybrids of common lilacs are known to resist ash tree yellows.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
White ash trees (Fraxinus americana) are native to the eastern United States and Canada, ranging naturally from Nova Scotia to Minnesota, Texas, and Florida. They are big, beautiful, branching shade trees that turn glorious shades of red to deep purple in the fall. Keep reading to learn white ash tree facts and how to grow a white ash tree.
White Ash Tree Facts Growing a white ash tree is a long process. If they don’t succumb to disease, the trees can live to be 200 years old. They grow at a moderate rate of about 1 to 2 feet per year. At maturity, they tend to reach between 50 and 80 feet in height and 40 to 50 feet in width. They also tend to have one leader trunk, with evenly spaced branches growing in a dense, pyramidal fashion. Because of their branching tendencies, they make very good shade trees. The compound leaves grow in 8- to 15-inch long clusters of smaller leaflets. In the fall, these leaves turn stunning shades of red to purple. In the spring, the trees produce purple flowers that give way to 1- to 2-inch long samaras, or single seeds, surrounded by papery wings.
White Ash Tree Care Growing a white ash tree from seed is possible, though more success is had when they’re transplanted as seedlings. Seedlings grow best in full sun but will tolerate some shade. White ash prefers moist, rich, deep soil and will grow well in a wide range of pH levels.
Unfortunately, white ash is susceptible to a serious problem called ash yellows, or ash dieback. It tends to occur between 39 and 45 degrees of latitude. Another serious problem of this tree is the emerald ash borer.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Ovoid to nearly heart shaped, covered in knobby gray/blue/green hues that look almost like scales on the outside and inside, sections of glistening, creamy-white flesh with a shockingly pleasant aroma. What are we talking about? Sugar apples. What exactly is sugar apple fruit and can you grow sugar apples in the garden? Read on to find out about growing sugar apple trees, sugar apple uses and other information.
What is Sugar Apple Fruit? Sugar apples (Annona squamosa) are the fruit of one of the most commonly grown Annona trees. Depending upon where you find them, they go by a plethora of names, amongst them include sweetsop, custard apple and the apropos scaly custard apple. The sugar apple tree varies in height from 10-20 feet with an open habit of irregular, zigzagging twigs. Foliage is alternate, dull green on top and pale green on the underside. Crushed leaves have an aromatic scent, as do the fragrant flowers which may be single or in clusters of 2-4. They are yellow-green with a pale yellow interior borne off of long drooping stalks. Fruit of sugar apple trees is as about 2 ½ to 4 inches long. Each fruit segment typically contains a ½-inch long black to dark brown seed, of which there may be up to 40 per sugar apple. Most sugar apples have green skins, but a dark red variety is attaining some popularity. Fruit ripens 3-4 months after flowering in the spring.
Sugar Apple Information No one is exactly sure where sugar apples hail from, but they are commonly cultivated in tropical South America, southern Mexico, the West Indies, Bahamas and Bermuda. Cultivation is most extensive in India and is wildly popular in the interior of Brazil. It can be found growing wild in Jamaica, Puerto Rico, Barbados and in the drier regions of North Queensland, Australia. It’s likely that Spanish explorers brought seeds from the New World to the Philippines, while the Portuguese are thought to have brought the seeds to southern India prior to 1590. In Florida, a “seedless” variety, ‘Seedless Cuban,’ was introduced for cultivation in 1955. It does have vestigial seeds and has a less developed flavor than other cultivars, grown primarily as a novelty.
Sugar Apple Uses The fruit of the sugar apple tree is eaten out of hand, separating the fleshy segments from the outer peel and spitting the seeds out. In some countries, the pulp is pressed to eliminate the seeds and then added to ice cream or combined with milk for a refreshing beverage. Sugar apples are never used cooked. The seeds of the sugar apple are poisonous, as are the leaves and bark. In fact, powdered seeds or dried fruit has been used as a fish poison and insecticide in India. A seed paste has also been used pasted on the scalp to rid people of lice. The oil derived from the seeds has also been used as a pesticide. Conversely, the oil from sugar apple’s leaves has a history of use in perfumes. In India, the crushed leaves are snorted to treat hysteria and fainting spells and topically applied to wounds. A leaf decoction is used throughout tropical America to treat a multitude of symptoms, as too is the fruit.
Can You Grow Sugar Apple Trees? Sugar apples need a tropical to near tropical climate (73-94 degrees F. or 22-34 C.) and are unsuited to most areas of the United States with the exception of some areas of Florida, although they are cold tolerant to 27 degrees F. (-2 C.). They thrive in dry areas except during pollination where high atmospheric humidity seems to be an important factor. So can you grow a sugar apple tree? If you are within that climactic range, then yes. Also, sugar apple trees do well in containers in greenhouses. The trees do well in a variety of soils, provided they have good drainage. When growing sugar apple trees, propagation is generally from seeds that may take 30 days or longer to germinate. To hasten germination, scarify the seeds or soak them for 3 days prior to planting.
If you live in a tropical zone and wish to plant your sugar apples in the soil, plant them in full sun and 15-20 feet away from other trees or buildings. Feed young trees every 4-6 weeks during the growing season with a complete fertilizer. Apply a 2- to 4-inch layer of mulch around the tree to within 6 inches of the trunk to retain moisture and regulate soil temperature.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
What is an African tulip tree? Native to Africa’s tropical rainforests, African tulip tree (Spathodea campanulata) is a big, impressive shade tree that grows only in the non-freezing climates of U.S. Department of Agriculture plant hardiness zones 10 and above. Want to know more about this exotic tree? Interested in knowing how to grow African tulips trees? Keep reading to find out.
Is African Tulip Tree Invasive? A cousin to the rambunctious trumpet vine, African tulip tree tends to be invasive in tropical climates, such as Hawaii and southern Florida, where it forms dense thickets that interfere with native growth. It is less problematic in drier climates like southern California and central or northern Florida. African Tulip Tree Information African tulip tree is indeed an impressive specimen with gigantic, reddish-orange or golden yellow trumpet-shaped flowers and huge, glossy leaves. It can reach heights of 80 feet, but growth is usually limited to 60 feet or less with a width of about 40 feet. The flowers are pollinated by birds and bats and the seeds are scattered by water and wind.
How to Grow African Tulip Trees African tulip trees are somewhat difficult to grow by seed but easy to propagate by taking tip or root cuttings, or by planting suckers. As far as growing conditions, the tree tolerates shade but performs best in full sunlight. Similarly, although it is relatively drought tolerant, African tulip tree is happiest with plenty of moisture. Although it likes rich soil, it will grow in nearly any well-drained soil.
African Tulip Tree Care Newly planted African tulip trees benefit from regular irrigation. However, once established, the tree requires little attention. It is rarely bothered by pests or disease, but may temporarily shed its leaves during periods of severe drought. African tulip trees should be pruned regularly because the branches, which tend to be brittle, break easily in harsh winds. For this reason, the tree should be planted away from structures or smaller trees that may be damaged.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Acacias are graceful trees that grow in warm climates such as Hawaii, Mexico and the southwestern United States. The foliage is typically bright green or bluish-green and the small blooms may be creamy white, pale yellow or bright yellow. Acacia may be evergreen or deciduous.
Acacia Tree Facts Most acacia tree types are fast growers, but they usually live only 20 to 30 years. Many varieties are valued for their long roots which help stabilize the soil in areas threatened by erosion. The sturdy roots reach deep for underground water, which explains why the tree tolerates extreme drought conditions. Many types of acacia are protected by long, sharp thorns and an extremely unpleasant flavor that discourages animals from eating the leaves and bark.
Acacia Tree and Ants Interestingly, stinging ants and acacia trees have a mutually beneficial relationship. Ants create cozy living quarters by hollowing out the thorns, then survive by eating the sweet nectar produced by the tree. In turn, the ants protect the tree by stinging any animals that attempt to munch on the leaves.
Acacia Tree Growing Conditions Acacia requires full sunlight and grows in nearly any type of soil, including sand, clay, or soil that is highly alkaline or acidic. Although acacia prefers well-drained soil, it tolerates muddy soil for short periods of time. Acacia Tree Care Acacia is basically a plant-it-and-forget-it type of tree, although a young tree may need protection from wildlife while it develops its defense system. During the first year, the tree benefits from an orchid fertilizer every three to four weeks. After that time, you can feed the tree a general purpose fertilizer once every year, but it isn’t an absolute requirement. Acacia requires little or no water. Acacia may need occasional pruning during the dry months. Avoid pruning leafy, green areas and trim only dead growth. Although the tree is disease-resistant, it can sometimes be affected by a fungal disease known as anthracnose. Additionally, watch for pests such as aphids, thrips, mites and scale.
Acacia Tree Types Acacia trees preferred by most gardeners are varieties that burst out with yellow blooms in the winter or early spring. Popular types include: Bailey acacia, a hardy Australian variety that reaches heights of 20 to 30 feet. Bailey acacia displays feathery, bluish-gray foliage and bright yellow wintertime blooms. Also known as Texas acacia, Guajillo is an extremely heat-tolerant tree that hales from southern Texas and Mexico. It is a shrubby plant that reaches heights of 5 to 12 feet. This species produces clusters of fragrant white flowers in early spring.
Knifeleaf acacia is named for its silvery-gray, knife-shaped leaves. Mature height for this tree is 10 to 15 feet. Sweet-smelling yellow flowers appear in early spring. Koa is a fast-growing acacia native to Hawaii. This tree, which eventually reaches heights and widths of up to 60 feet, displaying pale yellow blooms in spring.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Wedelia is a plant that has some very mixed reviews, and rightly so. While praised by some for its small, bright yellow flowers and ability to prevent erosion, it is also reviled by others for its aggressive spreading tendencies. Keep reading to learn both about growing wedelia groundcover and the dangers of wedelia propagation.
How to Grow Wedelia Wedelia (Wedelia trilobata) is an herbaceous perennial that’s hardy in USDA zones 8b through 11. It tends to grow to between 18 and 24 inches (45-62 cm.) high. It thrives in full shade, full sun, and everything in between, but it produces flowers most impressively in full sun. Its flowers are its most appealing feature: small, yellow, daisy-like, and very prolific. It can handle a wide range of pH levels and will perform well in virtually any soil. In other words, wedelia plant care is extremely low maintenance. It will grow and thrive almost anywhere as long as the weather is warm enough. The plant is extremely tough and can handle pruning almost down to the ground. The optimal height for blossom production is about 4 inches (10 cm.).
Managing Wedelia Plants The main aspect of wedelia plant care isn’t making sure it grows well, but rather making sure it doesn’t grow too well. Whenever wedelia stems touch the ground, they take root. This means the plant has an extremely aggressive spreading habit. While this is good news for one of the main wedelia plant uses, holding down soil in otherwise barren sites that are prone to erosion, it makes it very unsuited to backyards and gardens, where it is likely to completely take over.
In some states, it is classified as an invasive species. Check with your local extension office before planting. Even if it’s not an invasive species where you live, be very wary of planting this aggressive groundcover. If you do decide to plant, keep it in check by providing it only minimal water and fertilizer. With ample amounts of either, it will truly take off and overwhelm you.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
If you’re looking for a ground cover that thrives in deep shade where grass and other plants refuse to grow, look no further than snow on the mountain plant (Ageopodium podograria). Also called bishop’s weed or goutweed, the shallow roots of this quick-growing, deciduous ground cover sit above those of most companion plants so that they don’t interfere with their growth. Solid green varieties provide a lush, uniform appearance, and variegated forms have white highlights that glisten in deep shade.
Growing Snow on the Mountain Ground Cover Snow on the mountain plant is hardy in USDA plant hardiness zones 3 through 9. Growing Aegopodium is easy in the right location. It tolerates almost any soil as long as it is well-drained, and needs full or partial shade. Shade is particularly important in areas with hot summers. In locations with mild summer temperatures, snow on the mountain ground cover won’t mind some morning sun. One of the most difficult things about growing Aegopodium is preventing it from spreading into areas where it isn’t wanted. The plants spread by means of brittle underground rhizomes, and digging up unwanted plants often causes them to spread even more because broken bits of rhizomes quickly form new plants.
To compensate for this, install an edging that sinks a few inches under the soil around the bed to contain the plants. If it spreads beyond the desired area, an herbicide may be the only solution. Snow on the mountain plant only responds to herbicides when there is new growth on the plant, so use it in early spring or mow down the plants and allow new growth to emerge before spraying the plants. When growing variegated forms of snow on the mountain plant, you may occasionally see a solid green plant. Dig these plants out immediately, getting rid of as much of the rhizomes as you can. Solid forms are much more vigorous than the variegated ones and will soon overtake the area.
Care of Snow on the Mountain Bishop’s weed requires very little care. The plants grow best if watered during dry spells. In late spring or early summer, the plants produce small, white flowers. Many growers think the flowers detract from the attractive foliage and pick them off as they appear, but removing the flowers isn’t necessary to keep the plants healthy. After the bloom period, run a lawn mower over the plants to rejuvenate them. They’ll be ankle high again in no time.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Also known as goutweed and snow on the mountain, bishop’s weed is a rambunctious plant native to western Asia and Europe. It has naturalized across most of the United States, where it isn’t always welcome due to its extreme invasive tendencies. However, bishop’s weed plant may be just the thing for tough areas with poor soil or excessive shade; it will grow where most plants are doomed to fail. A variegated form of bishop’s weed plant is popular in home gardens. This form, (Aegopodium podagraria ‘Variegatum’) displays small, bluish-green leaves with white edges. The creamy white color provides a luminous effect in shady areas, which probably explains why bishop’s weed plant is also known as “snow on the mountain.” Eventually, you may notice variegation loss in bishop’s weed plants. If your bishop’s weed is losing its variegation, read on for information.
Variegation Loss in Bishop’s Weed Why is my snow on the mountain losing color? Well, for starters, it’s normal for the variegated form of bishop’s weed to revert back to solid green. You may even notice areas of solid green leaves and variegated leaves mixed together in a single patch. Unfortunately, you may not have much control over this phenomenon. Variegation loss in bishop’s weed may be more prevalent in shady areas, where the plant has the misfortune of both low light and low chlorophyll, which are required for photosynthesis. Going green may be a survival tactic; as the plant goes green, it produces more chlorophyll and is able to absorb more energy from sunlight.
You may be able to do some trimming and pruning of trees or shrubs that keep your bishop’s weed plant in shade. Otherwise, variegation loss in bishop’s weed is probably irreversible. The only answer is to learn to enjoy the non-variegated, bluish-green leaves. After all, it’s just as attractive.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
If “snakebush” makes you think of a long, scaly vine, you’re in for a surprise. According to snakebush plant information, this lovely little plant offers delicate mauve flowers that look wonderful in hanging baskets. So exactly what is a snakebush? Read on for tips on growing snakebush plants.
What is a Snakebush Plant? Native to Western Australia, snakebush bears the scientific name of Hemiandra pungens, and it’s also known as the snake plant. But the only thing snake-like about it is how it stays very close to the ground. Snakebush plant information tells you that this tiny plant offers dense, pointed foliage that looks like needles. Its mauve or light purple flowers arrive in spring and last much of the summer. The flowers grow in tube shapes. Each blossoms has an upper “lip” with two lobes and a lower “lip” with three and carry a sweet fragrance.
Growing Snakebush Plants Since snakebush is dense, and prostrate, it makes an excellent ground cover. Snakebush ground cover has the added advantage of being drought resistant when mature. You’ll need a sunny location to make this plant happy. Growing snakebush plants is easier in well-drained soil, but the plants will also survive in sites with poor drainage. On the other hand, you may have a hard time finding the seeds in commerce. You can grow snakebush by taking cuttings from a friend’s garden. Growing snakebush is fairly easy from cuttings.
Care of Snakebush Once you’re able to acquire the snakebush, you’ll find that you won’t have much to do if you plant it in the right location. It is both drought and frost tolerant. Snakebush ground cover accepts temperatures down to 25 degrees Fahrenheit (-4 C.) without any damage. You’ll have a better experience growing snakebush plants if you live in a dry climate. Those gardeners in regions with hot, wet summer will have the hardest time. Care of snakebush plants in humid areas is difficult and the species cannot be grown reliably.
It works well as part of a low-maintenance backyard, beside the swimming pool or a courtyard garden. If you are putting in a cottage or flower garden, include snakebush in the mix.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Rock cress is an herbaceous perennial and member of the Brassicaceae or mustard family. The flowers and leaves of rock cress are edible. Growing rock cress requires no special skill and this plant is well suited for the novice gardener. Rock cress has many uses in the garden but its most popular uses are as an attractive border in a rock garden or dangling down over a rock wall or ledge. Rock cresses are alpine plants and will thrive where other plants fail, such as on hills and slopes.
Purple rock cress ground cover (Aubrieta deltoidea) hugs the ground like a mat and displays rich purple flowers in April through the middle of May and has a lovely scent. Rock wall cress (Arabis caucasica) is more likely to bloom in white or pink. Both make attractive low mounds that look great at the edge of retaining wall where they get full sun and excellent drainage.
How to Grow Rock Cress Rock cress plants are hardy in USDA plant hardiness zones 4-7. They are easily grown from seed and can be directly sown into the garden in early spring or started indoors four to six weeks before the date of your last expected frost. Rock cress prefers full sun but will tolerate some shade, especially in warmer climates. Space rock cress plants 15 to 18 inches apart and they will fill in quickly forming a mat in any open space.
Care of Rock Cress Plants Regardless of the type you choose to grow, the care of rock cress plants is relatively minimal. Water new rock cress plants regularly and only when the soil is dry once they are established. Rock cress ground cover does well in fair soil that has good drainage, and is slightly acidic. Applying a light pine needle mulch helps retain moisture and increase acidity. A high nitrogen fertilizer can be applied when first planting and a phosphorus fertilizer just after blooming. Rock cress will bloom the second spring after planting and every year after that. Regular pruning to remove dead flowers will keep the plant healthy and encourage new growth.
It is seldom necessary to treat rock cress for pests or disease. Now that you know the basics on how to grow rock cress ground cover, you can add an attractive touch to a rock garden or wall
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