动态第953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14日

While begonias produce lovely, delicate flowers, they are heat-loving annuals that landscapers depend upon for their toughness. Depending upon your landscape conditions, there is a begonia to fit the bill. Begonias come in many varieties, with light requirements ranging from full sun to heavy shade. In fact, there are over 1,500 named begonia species; this lists focuses on the most popular and readily available varieties. Remember that begonias are annuals, meaning they will not survive freezing temperatures. Unless you live in a tropical climate, you'll need to replant your begonias each year. [图片]Bronze Leaf Begonias Bronze leaf begonias have a reddish, bronze cast. With their reddish, bronze-tinted leaves, bronze leaf sempenflorens begonias, also called wax begonias, are striking in appearance and tough in spirit. They can stand up to the summer sun in many parts of the country. However, in some very hot climates, bronze leaf begonias may scorch in full sun. Crispy brown leaf edges are a sign that your begonias need a break from the sun. Green Leaf Begonias Green leaf begonias have bright or light green leaves. Also a sempenflorens or wax variety, green leaf begonias are very similar in appearance to their bronze leaf cousins, but can easily be distinguished by their bright green or light green leaves. While the bronze leaf varieties thrive in full sun, green leaf begonias require shade or dappled shade, with, at most, gentle morning sun. While they bloom no matter how high the temperature rises, they scorch in too much sun. Brown, dried leaf edges will alert you that your green leaf begonias are getting too much sun. [图片]Angel Wing Begonias Angel wing begonias have leaves that resemble wings. Angel wing begonias, also called cane begonias or dragon wing begonias, can be identified by their wing-shaped leaves and bamboo-like stems. Angel wing begonias are some of the largest begonias, with cane-like stems that can grow up to 15 feet tall in tropical climates, where they have the opportunity to grow season after season. Angel wing begonias can take full sun in cooler months, but need some shade in hotter months. Growing them in pots allows you to move them throughout the growing season as necessary. Tuberous Begonias In general, tuberous begonias produce larger, more-rounded flowers than other types. Like other types of begonias, tuberous begonias bloom all summer long regardless of the heat. Tuberous begonias do best in bright indirect light, protected from strong direct sunlight that can burn their tender leaves. Tuberous begonias are prized for their larger, rounded flowers. Unlike other begonia species, tuberous begonias grow from tubers, which can be dug up in the fall before the first freeze, stored over the winter and replanted the following spring.

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Miss Chen

2017年08月14日

The petunia -- with its long blooming period and low maintenance requirements -- remains one of the most popular flowering plants among gardeners, according to Clemson University Cooperative Extension. The plant grows 6 to 18 inches in height and spreads up to 4 feet, making it ideal for borders, containers and mass plantings. [图片]Flowering Petunias are annual flowers that bloom from spring until frost in the fall. Flowers reach up to 4 inches in diameter, depending on the cultivar, with the 'Grandiflora' variety producing the largest blooms. All petunias, but especially white and purple ones, produce a pleasant fragrance. Growing Conditions Although petunias are annuals, providing the best possible growing conditions allows petunias to produce more flowers for a longer period of time. Choose short and compact plants at the nursery, preferably ones without flowers, for best results when transplanting. Place petunias in full sun to avoid spindly plants with few flowers. Water deeply on a weekly basis and apply balanced fertilizer monthly to encourage root development and support fast growth and abundant flower production. [图片]Deadheading Removing old blooms allows petunias to put energy into new flower production rather than increased size and foliage development. This also improves the appearance of the plant.

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Miss Chen

2017年08月14日

Often referred to and grown as annuals, petunias (Petunia spp.) are technically warm climate perennials. They grow year round in U.S. Department of Agriculture plant hardiness zones 10 through 11. These brightly colored flowers grow quickly and flower abundantly, making them ideal for adding color to window boxes, flowerbeds and planters. If you can't grow them year-round, grow petunias as annuals for dazzling spring, summer and early fall color. [图片]The Difference [图片]A true annual goes to seed after flowing and dies shortly after that in all climates. Petunias act like annuals in frosty areas, dying back with the first cold snap. As a mild climate perennial, however, petunias have the ability to grow year-round in the right climate. They like mild, frost-free winters, and summers that rarely rise above 90 degrees Fahrenheit, with low humidity. Most areas don't provide these specific requirements, so petunias are most commonly grown as warm season annuals in frost-prone areas and as cool season annuals in tropical and subtropical areas. Warm Season Annuals [图片]Plant petunias outdoors in the spring after the last frost date when the soil warms up to 60 degrees F. Plant petunias from starts or seedlings. If you want to grow them from seed, start petunias indoors in a seed flat 10 to 12 weeks before your spring planting date. Plant starts in a spot that gets full sun at least six hours per day, with well draining soil. After the first frost, remove the spent petunia plants, and plan to replant starts in the spring. Finicky Warm Climate Perennials [图片]In frost-free regions where summers tend to get hot, plant petunias in the fall. You'll have flowers through the winter and spring months. Often, petunias will fade or burn out in the summer when temperatures go above 90 F. When petunias get faded and wilted during a hot summer, remove them and then replant in the fall when temperatures drop back down reliably below 90 F. Petunias only grow year-round as a true perennial in areas with mild winters and cool summers. Overwintering Petunias [图片]While petunias are plentiful and relatively inexpensive at the beginning of the growing season it is possible -- though they can be difficult to keep alive indoors -- to overwinter the plants. Dig out the root ball in the fall before frost, and transplant the petunias into nursery pots. Keep them indoors in bright light through the winter. Water when the soil dries out and mist the leaves with clean water every few days. Any room temperature area above 55 F but below 90 F will keep petunias happy through the winter. In the spring, replant petunias outdoors.

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Miss Chen

2017年08月14日

Impatiens (Impatiens wallerana) is an annual flower that thrives in partial to full shade. They produce colorful blooms from early summer to fall. Their leaves are an attractive dark green color, though under the wrong growing conditions, they may turn yellow. [图片]Considerations Downy mildew is a fungus disease that affects impatiens. In addition to premature leaf fall and stunting, other symptoms include yellowing leaves. Other diseases affecting impatiens include verticillium wilt and botrytis blight. Both diseases also cause leaves to turn yellow. Fungicides may help treat the impatiens in the early stages of any of these plant diseases. Significance Over-watering impatiens may cause leaves to turn yellow. To prevent this, keep the soil moist between waterings. Alternatively, too little water may cause impatiens' leaves to turn yellow as well. If the soil is dry and yellow leaves appear, it's time to water the impatiens. [图片]Nutrient Deficiency Impatiens requires a monthly application of a water-soluble fertilizer. Not getting the correct amount of fertilizer may stunt plant growth and turn leaves yellow. Always follow the recommended application rate when applying fertilizer to impatiens.

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Miss Chen

2017年08月14日

Dwarf snapdragon cultivars (Antirrhinum majus) grow 8 to 12 inches tall, significantly shorter than standard snapdragons, which grow 1 1/2 to 3 1/2 feet tall. With full sun and well-draining soil, these little perennials brighten up the landscape with colorful white, yellow, peach, pink, purple, red and bi-colored flowers. Through dwarf snapdragons are technically perennials in U.S. Department of Agriculture plant hardiness zones 7 through 10, you can also treat them as annuals in USDA zones 7 and lower. [图片]Continuous-Release Fertilizer Fertilize dwarf snapdragons once in spring, right after planting, in USDA zones 2 through 7. In USDA zones 8 through 10, fertilize in fall after planting to provide nutrients for the winter growing season. Use a continuous-release fertilizer, such as a 12-4-8 product, to provide sustained nutrients. Use 4 tablespoons per 4 square feet or bed around the dwarf snapdragons. Scatter the dry fertilizer evenly over the soil, then water the area until the soil is damp 6 inches deep. Water Regularly Water dwarf snapdragons when the top 1/2 to 1 inch of the soil starts to feel dry, giving the bed enough water to dampen the soil 6 inches deep. Caring for dwarf snapdragons successfully requires a delicate balance of regular water, without watering too much. Constantly wet, muddy soil can cause them to grow poorly. Removing the Flowers As dwarf snapdragons bloom and go to seed, remove the dead and fading flowers. This encourages the plants to bloom more abundantly through the season. To remove the dead flowers, a process called deadheading, pinch the stalk directly below the flower using your fingernails. Wash your hands with soap and water after. [图片]Pests and Problems Check dwarf snapdragons for aphids through the growing season. Aphids, small, soft-bodied insects that can be green, black or pink, feed on the leaves and flowers. Also keep an eye out for spider mites, which are minuscule white pests that form a fine webbing over the leaves where they are feeding. Start by washing aphids and spider mites off with a strong stream of water, then check daily and follow up with additional water. If the pests keep coming back, mix 4 teaspoons of insecticidal soap with 1 quart of water in a clean garden sprayer or spray bottle. Use the mixture to spray the insects and affected leaves, until the area is wet. Repeat every four to seven days until the pests are eradicated.

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Miss Chen

2017年08月14日

Chinese lantern plants (Physallis) have husks that resemble bright orange paper lanterns once dried. Inside each husk is a scarlet fruit, similar in texture but not color to its close relative, the tomatillo. The fleshy fruit surrounds the seeds within. Chinese lanterns are annual plants, so they must be replanted in the garden each year. They readily self-sow themselves, but saving some seed allows you to plant the lanterns exactly where you want them to grow each spring. [图片]Step 1 Pick the lanterns from the plant once the husks have dried completely and turned papery. Peel the husk away from the fruits. Step 2 Place the fruits in a blender. Add water until the fruits are covered. Place the lid on the blender, then process them on the pulse setting until they are pulverized. Step 3 Pour the pulverized fruit into a bowl. Add another 1 to 2 cups of water to the mixture and stir to combine. Step 4 Soak the seeds for two to three days, or until the pulp separates and floats to the top of the water. Pour the water and pulp off the top of the bowl. The viable seeds settle to the bottom. [图片]Step 5 Remove the remaining seeds from the bowl with a slotted spoon. Place them in a mesh sieve and rinse the remaining pulp from them under running water. Step 6 Spread the seeds out on a paper towel in a well-ventilated area. Dry them for seven days. Step 7 Store the seeds in an airtight container in a cool, dark place until you are ready to plant them in spring. Label the container with the type of seed and the year harvested.

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Miss Chen

2017年08月14日

If you have a sunny spot in the garden that tends to stay dry during the summer, a cheerful little plant called moss rose (Portulaca grandiflora) could be the perfect choice to brighten this area. A semi-succulent, creeping plant, it's named for the roselike appearance of its flowers, that come in pink, red, yellow, orange or white. A tough, easy-to-grow plant, moss rose is an annual, but it self-seeds readily and can keep an area filled with colorful flowers year after year. [图片]New Seeds From Old Flowers Moss rose comes in many different cultivars, some with single flowers and others with extra-showy, double flowers. Flowers on all types grow on the tips on the plant's stems, opening fully in the sun and closing overnight. The flowers also stay closed on overcast days. Grow the plant in a spot with excellent drainage that gets full sun all day to get the most flowers, which will open nonstop from midsummer into fall. Although moss rose doesn't live through winter and is easily damaged by cold weather, you can promote a self-renewing plot by leaving the flowers on the plant. They will eventually wilt and, over time, petals will fall. Next, the remaining central part of the old flower develops tiny black seeds that drop to the ground when mature. Seedlings the Following Spring If you want to see new moss rose seedlings in the same spot next spring, avoid raking or disturbing the soil under the plants, because the seeds need light to germinate. When fall arrives and the plants begin to die back, cut them off carefully just above the soil line to keep the area tidy, but don't pull the plants out by the roots to avoid burying seeds that have dropped. If you live where winter temperatures fall below freezing, the remaining plant parts will die back and dry up before spring arrives. When weather warms the following spring, keep the soil in the self-seeded area moist. Once moss rose seedlings appear, you can allow them to grow in place or carefully dig them up, adding them to containers or re-locating them in the garden. Flowers Until Fall Like many flowering plants, moss rose slows flower production once it produces mature seeds. Eventually, flowering stops and the plant starts to fade near the end of the season. But removing spent flowers as they appear -- called deadheading -- helps keep new flowers coming throughout the season and promotes strong new growth. [图片]You can have the best of both worlds by removing all but a few old flowers from the plant, letting the remaining blooms fade naturally and set seeds. In response, the plant continues making new flower buds, keeping new flowers coming -- but fewer of them -- later in the season. Use sharp shears when deadheading to cut off stem tips that bear flowers, wiping your blade with rubbing alcohol between cuts to discourage spread of plant diseases. Other Care Issues Although the moss rose is drought-tolerant, it flowers best when it gets regular water, with about 1 inch of water weekly, including rain, being best. A naturally creeping plant, it can spread to cover an area up to 2 feet wide, developing into a flower-covered, 6-inch-tall mound. This plant is generally free of pests and diseases, although it might develop root rot if grown in an overly wet area. An affected plant has soft, brown roots and tends to die back, with damage starting at its base. It's best to dig up and throw out any affected plant and re-plant new seedlings in a drier area.

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Miss Chen

2017年08月14日

Deer are attracted to well-fertilized plants, such as those grown in gardens. Deer obtain protein, minerals, salt and one-third of their water intake from tender foliage and irrigated plants, according to the University of Georgia. Petunias tend to attract deer. [图片]Deer Resistance Petunias (Petunia spp.), a popular garden annual, are occasionally or frequently browsed by deer. Deer are especially attracted to moist plants, such as petunias, in spring and summer. Features Petunias grow from 6 to 36 inches tall. Plants can grow as trailing ground cover or as hedges. Petunias produce flowers from May through October in a variety of colors, including pink, purple, red, white and yellow. [图片]Cultivation Plant petunias in full sun and well-drained, moist soil. Avoid heavy soil, as this can affect blooming. Petunias are susceptible to gray mold, aphid infestation and slug damage. Pinch plants at the end of the season to help plants keep blooming.

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Miss Chen

2017年08月14日

Named for its edible leaves, Jamaican sorrel (Hibiscus sabdariffa var. sabdariffa) is also called red sorrel, roselle and Florida cranberry. This shrub is a short-lived perennial in U.S. Department of Agriculture plant hardiness zones 10 through 11 and an annual in colder zones. Growing 5 to 7 feet tall, Jamaican sorrel's narrow, lobed leaves and stems are reddish-green, and it flowers late fall through early winter. Its flower bases, called calyces, are used for making jellies, jams, juices and wines. [图片]Needs and Tolerances Jamaican sorrel requires a full-sun site but tolerates a variety of other growing conditions. Thriving in sandy soil rich in organic matter, Jamaican sorrel tolerates most soil types and a pH range between 4.5 and 8. This adaptable plant also tolerates strong winds, flooding and stagnant water, and grows at elevations up to 4,100 feet. Jamaican sorrel suffers damage from fog and frost but grows well in humid, warm conditions. In its native homelands it receives 59 to 79 inches of rainfall a year, and it requires constantly moist soil in cultivation. Spacing and Mulching Spacing for Jamaican sorrel depends on the reason for growing it, but all plants benefit from mulching. If growing Jamaican sorrel as an ornamental shrub or for its leaves, space plants 3 feet apart, but if you're cropping Jamaican sorrel for its calyces, grow three plants together on mounds 6 inches tall and 2 feet in diameter. Space mounds 3 to 6 feet apart in rows 5 to 10 feet apart. Mulching with manure helps protect Jamaican sorrel from root pests, suppresses weeds, conserves soil moisture and supplies plant nutrients. Spread a 2-inch layer of well-rotted manure around plants, avoiding the stems. Weeds and Fertilizer Weeding and fertilizing Jamaican sorrel promotes vigorous, healthy growth. Remove weeds from around plants weekly until they grow 1 1/2 to 2 feet tall, when their foliage shades out further weed growth. If growing the plant for its edible flower buds, fertilize Jamaican sorrel lightly, applying a 24-8-16 feed diluted at a rate of 1/2 tablespoon per gallon of water every two weeks, or at half the rate recommended in the manufacturer's instructions. Fertilize Jamaican sorrel with 24-8-16 feed diluted at a rate of 1 tablespoon per gallon of water, or at the recommended rates, if growing the plant as an ornamental or to harvest its foliage. Water Jamaican sorrel when the soil is dry to a depth of 1 inch. Harvesting and Rotating Harvest Jamaican sorrel leaves and calyces at different times, and rotate plants to different growing areas each year. Jamaican sorrel leaves are ready to pick 10 weeks from sowing. If growing shrubs for foliage and calyces, remove stems to 3 to 4 inches above the ground three times at intervals of four weeks, and then allow the plants to regrow and produce calyces for harvest. Calyces are ready to pick when they're plump and have stopped growing. Rotating Jamaican sorrel to different spots every year discourages root nematode infestations. Jamaican sorrel grows from seed and cuttings.

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Miss Chen

2017年08月14日

Annual bread-seed or lettuce-leaf poppies (Papaver somniferum) produce flat, tissue-papery blooms in shades of pink, red, purple and white. They grow 4 to 5 feet tall, with lush, pale green foliage that stands upright from the stalk. These are the same poppies that are the source of opium and it is illegal in the United States to grow them for that purpose. [图片]Colors While specific strains, such as Lauren's Grape (purple), Danish Flag (deep orange with white feathery centers) and peony poppies (multiple petals in jewel tones) are offered in commercial seed packages, grocery-store poppy seeds grow just as well, although in limited colors and types. Most produce a single pink poppy flower. Timing Annual poppies grow best if they get a period of cold, so it is often recommended that they be planted in fall or sprinkled on the snow. However, especially in areas with wet winters and cold springs, planting in mid-February yields better results. Planting Scatter the seeds on the ground and do not cover them, as sunlight is needed for germination. If your climate is dry, keep the seeds moist with a fine spray from the hose until they come up. When the plants are about 3 inches tall, thin out any crowded clumps. Gathering Seeds Poppy flowers last only a few days. After the petals drop, the poppy seed heads will begin to dry. Leave them on the plant until the stalks have turned beige and the slits at the top of the poppy pod have opened to release the seeds. Gather the heads and let them dry completely, then shake out the seeds. [图片]Replanting Many of the seeds will fall to the ground and plant themselves, but save some seeds to scatter again in spring, especially if the grocery-store seeds yield any unusual colors or forms that you wish to grow again.

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