动态第946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17日

Many people grow Christmas cactus (Schlumbergera bridgessii). This plant makes a great holiday gift for friends and family, so knowing how to propagate and grow Christmas cactus can help make this shopping easier and less hectic. Propagating Christmas Cactus Propagating Christmas cactus is easy. In fact, when it comes to the Christmas cactus, propagating is a great way to share this wonderful plant with others. Propagating Christmas cactus begins by simply taking a short, Y-shaped cutting from the stem tip. The cutting should consist of at least two or three joined segments. When doing Christmas cactus propagating, always be sure that cuttings are taken from healthy foliage. Allow the cutting to dry a few hours before potting it up for rooting, as to avoid potential stem rot from excessive moisture. [图片]Rooting Christmas Cactus Rooting Christmas cactus cuttings is simple. Once you’ve taken your cutting, place the segment in a moist peat and sand soil mix. Insert the segment about a quarter of its length below the soil surface. Place the pot in a well-lit area, avoiding direct sunlight. Water the cutting sparingly at first to prevent rotting. After about two or three weeks of rooting Christmas cactus cutting, the cutting should start showing signs of growth at the tips of its leaves, which is usually reddish in color. Once your cutting has rooted, it can be transplanted into a pot with loose potting soil, preferably with a little sand or compost added. The cutting may wilt some in the beginning, but this is normal and will eventually subside once the plant has taken to its new environment. The Christmas cactus may be watered more frequently, fertilized and given additional light at this time. Christmas cactus propagating doesn’t get any easier than this. [图片]Grow Christmas Cactus While Christmas cactus can adapt to and be grown in low light, the plant will produce more blooms with brighter light conditions. However, stay away from direct sunlight, which may burn the leaves. Don’t allow this plant to dry out completely between watering intervals. Christmas cactus also enjoys average to high humidity with temperatures hovering between 60-70 F. (16-21 C.) Placing the pot on a tray of pebbles and water can add more humidity to drier surroundings. Watering should be done frequently and thoroughly, keeping the soil moist but not saturated. Make sure there is adequate drainage provided to prevent the Christmas cactus from rotting. Apply a mild houseplant fertilizer every other week. Water and fertilize regularly in spring and summer; however, during the winter months, this plant should be kept on the dry side, withholding water for six weeks. Growing and propagating Christmas cactus can be very rewarding, especially when you give them to others during the holidays.

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2017年08月17日

Figuring out how to make a Christmas cactus bloom can be tricky for some. However, by following the proper watering guidelines and ensuring that just the right light and temperature conditions are given, learning to force a Christmas cactus to bloom can actually be quite easy. [图片]How to Make Christmas Cactus Bloom When you want to force a Christmas cactus to bloom, you need to begin by limiting the amount of water the plant receives. This generally takes place sometime during fall, usually around October or the first part of November. Cut down on watering just enough to allow the soil to remain slightly moist. Water only when the topmost (about 1 inch) layer of soil is dry to the touch. This will enable the plant to enter dormancy. Dormancy is critical for getting a Christmas cactus to bloom. In order to further force a Christmas cactus to bloom, you’ll need to move the plant where it will receive about 12-14 hours of darkness. Bright, indirect light during the day is fine; however, Christmas cactus requires at least 12 hours of darkness at night in order to encourage bud development. Your Christmas cactus, dark conditions aside, will also need cool temperatures. This should average out to about 50-55 degrees F. (12 C.). Therefore, make sure the location will accommodate both light and temperature requirements. [图片]Care of Christmas Cactus in Bloom Christmas cactus plants should continue receiving dark, cool treatment for at least 6-8 weeks, or until buds begin forming. Once buds have formed, it usually takes up to 12 weeks (or less) for blooms to appear. The plant should also be relocated at this time. Move the Christmas cactus to a sunny, draft-free area. However, keep it away from direct sunlight, as this may cause the plant to become droopy looking. Also, drafty areas can cause the buds to drop before blooming has occurred. Giving the plant more bright, indirect sunlight will produce more blooming. Christmas cactus also bloom better as pot-bound plants. While watering may be increased during blooming, the amount will vary according to the plant’s current light conditions, temperatures and humidity levels. When you force a Christmas cactus to bloom by giving it the proper care, in the right place, receiving the right light and temperature conditions, the Christmas cactus will not only bloom but may also surprise you by continually producing blooms several times throughout the year. Knowing how to make a Christmas cactus bloom will help you to enjoy the lovely flower on this popular plant.

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2017年08月17日

Because Christmas cactus plants are so easy to care for, it is not uncommon for a Christmas cactus to eventually grow to a monstrous size. While this is lovely to see, it can create problems for a homeowner with limited space. At this time, an owner may wonder if pruning a Christmas cactus is possible and exactly how to trim a Christmas cactus. Christmas cactus pruning is not just for large plants, either. Pruning a Christmas cactus, large or small, will help it to grow fuller and more bushier, which in turn results in more blooms in the future. So whether you are looking to simply reduce the size of your plant or are looking to make yours look even more beautiful, keep reading to learn more about how to trim a Christmas cactus. [图片]When to Prune Christmas Cactus Plants The best time to prune a Christmas cactus is right after it has bloomed. At this time, the Christmas cactus will be entering a growth period and will start to put out new leaves. Pruning a Christmas cactus right after it blooms will force it to branch out, which means the plant will grow more of its distinctive stems. If you are not able to do your Christmas cactus pruning right after it blooms, you can prune the plant any time from after it blooms until late spring without doing harm to the Christmas cactus plant. [图片]How to Trim a Christmas Cactus Because of the unique stems, pruning a Christmas cactus is perhaps one of the easiest pruning jobs there is. All you need to do to prune a Christmas cactus is give the stems a quick twist between one of the segments. If this seems a bit harsh on your plant, you can also use a sharp knife or scissors to remove the segments. If you are pruning a Christmas cactus to reduce its size, you can remove up to one-third of the plant per year. If you are trimming Christmas cactus plants to make them grow in more fully, you only need to trim the end one to two segments from the stems. The really fun thing about trimming a Christmas cactus is that you can easily root the Christmas cactus cuttings and give the new plants to friends and family.

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2017年08月17日

You’ve been caring for it all year and now that it’s time to expect winter blooms, you find the leathery leaves wilted and limp on your Christmas cactus. You may be wondering why is my Christmas cactus limp? Correct Christmas cactus problems, such as a limp Christmas cactus, with these simple tips. [图片]Christmas Cactus Problems Wilted or limp Christmas cactus is sometimes caused by a lack of water or too much direct sunlight. If you’ve neglected to water the limp Christmas cactus, begin by giving the plant a limited drink. Continue to water sparingly every few days until the soil is lightly moist. Soil that is too wet causes Christmas cactus problems too. As an epiphyte in its native home on the tropical forest floor, the Christmas cactus absorbs water and nutrients from the air, and as such can’t handle soggy roots. Poor drainage and soggy roots can make Christmas cactus very limp. If your wilted or limp Christmas cactus has leaves that appear to be parched or scorched, move it to an area with more shade, particularly in the afternoon. [图片]Reviving a Limp Christmas Cactus When the Christmas cactus is very limp and soil is soggy, repot into fresh soil. Remove the limp Christmas cactus from the pot and gently remove as much soil as possible. Avoid future Christmas cactus problems by mixing your own soil for repotting. Use a good quality potting soil at two parts potting soil to one part sand or vermiculite, assuring sharp drainage. Even if the soil is not soggy, repotting may be the solution to reviving a limp Christmas cactus. While the plant likes to be tight in the pot, moving it to a slightly larger container with fresh soil every few years helps avoid Christmas cactus problems. [图片]Results of Christmas Cactus Problems If you’re able to revive the plant, you may get winter blooms. The stress the plant has experienced may cause this year’s blooms to drop prematurely. When all your blooms drop at once, expect an outstanding show next year from what was once your limp Christmas cactus.

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2017年08月17日

The Christmas cactus is a long-lived plant that is often passed from one generation to another. You can pretty much ignore the cactus with deep but infrequent watering and it will thrive. However, an overwatered Christmas cactus plant will succumb to root rot and that family heirloom may pass on to the compost heap. Saving an overwatered Christmas cactus requires swift decisive action to prevent this tragedy. Christmas cacti hail from the coastal mountains of southeastern Brazil. They belong to the genus Schlumbergera, which includes all the holiday cacti. Their native region receives plentiful rain much of the year, so Christmas cactus is not the classic drought tolerant desert variety. They need a good drenching, but then the soil should be allowed to almost dry out. During flowering they need to be kept moderately moist but take care not to use too much water on Christmas cactus. [图片]Overwatering Symptoms on Christmas Cactus Any cactus that has been allowed to sit in a saucer full of water is likely to have its health reduced. An overwatered Christmas cactus plant will show obvious signs of distress. If the saucer has not dried in one day, you should always dump the excess water to prevent moisture gnats and keep the roots from rotting. In case you didn’t remember to do this, one of the first overwatering symptoms on Christmas cactus will be limp leaves, which will start to drop off. Then the stems and branches will soften and get mushy. Severe cases will manifest with a foul odor and the stem will rot completely off. Prevention is simple. Use a soil meter to keep from putting too much water on Christmas cactus. Tips on Saving an Overwatered Christmas Cactus [图片]Tips on Saving an Overwatered Christmas Cactus Overwatering is one of the classic Christmas cactus problems, so don’t feel too bad if your plant starts exhibiting symptoms. Act fast and dump out any standing water, then carefully remove the plant from its container. Remove any stems that have started to get soft. Rinse the roots to remove any fungus that might have started to grow and then let them dry out for a day on the counter. Repot the plant the next morning and let it stay dry for a day or so before beginning a regular water regimen. If you caught it quickly enough, the plant should recover. Use your soil meter to prevent any future Christmas cactus problems, as the weakened plant might not withstand another bout of illness. Just in Case! Christmas cactus is one of the easiest plants from which to get cuttings. Choose healthy stems and root them in a glass of water or stick them into perlite or vermiculite to get roots started. Transplant them in a mixture of one part sand, one part potting mix and one part orchid bark for superior drainage. Use an unglazed pot to encourage evaporation of excess moisture. This will help ensure that you won’t have to worry again about saving an overwatered Christmas cactus. Provide full sun until a few weeks before the blooming period. Then allow it to have a dark period of at least 14 hours per day to promote flowering. Also, suspend watering for this period. Soon you will have a holiday cactus to brighten your festivities and share with friends and family.

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2017年08月17日

Christmas cactus is a jungle cactus that prefers humidity and moisture, unlike its standard cactus cousins, which require a warm, arid climate. A winter-bloomer, Christmas cactus displays flowers in shades of red, lavender, rose, purple, white, peach, cream and orange, depending on the variety. These prolific growers eventually need to be repotted. Repotting Christmas cactus isn’t complicated, but the key is knowing when and how to repot a Christmas cactus. [图片]When to Repot Christmas Cactus Most plants are best repotted when they display new growth in spring, but Christmas cactus repotting should be done after blooming ends and the flowers have wilted in late winter or early spring. Never attempt to repot the plant while it is actively blooming. Don’t rush to repot Christmas cactus because this hardy succulent is happiest when its roots are slightly crowded. Frequent repotting can damage the plant. Repotting Christmas cactus every three to four years is usually adequate, but you may prefer to wait until the plant begins to look tired or you notice a few roots growing through the drainage hole. Often, a plant can bloom happily in the same pot for years. [图片]How to Repot a Christmas Cactus Here are some Christmas cactus potting tips that will help you find success: Take your time because repotting a Christmas cactus can be tricky. A lightweight, well-drained potting mixture is critical, so look for a commercial mix for bromeliads or succulents. You can also use a mixture of two-thirds regular potting soil and one-third sand. Repot Christmas cactus into a pot only slightly larger than the current container. Be sure the container has a drainage hole in the bottom. Although Christmas cactus likes moisture, it will soon rot if the roots are deprived of air. Remove the plant from its pot, along with the surrounding soil ball, and then gently loosen the roots. If the potting mix is compacted, gently wash it away from the roots with a little water. Replant the Christmas cactus in the new pot so the top of the root ball is about an inch below the rim of the pot. Fill in around the roots with fresh potting mix and pat the soil lightly to remove air pockets. Water it moderately. Put the plant in a shady location for two or three days, then resume the plant’s normal care rout

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2017年08月17日

When you think of cactus, you probably envision a desert with heat wavering vistas and blazing sun. You aren’t too far off the mark with most cacti but the holiday cacti actually flower better in slightly cooler temperatures. They are tropical plants that need slightly cooler temperature to set buds but that doesn’t mean that Christmas cactus cold tolerance is high. Christmas cactus cold damage is common in cold drafty homes. [图片]Christmas Cactus Cold Hardiness Holiday cacti are popular houseplants that bloom around the holiday in their name. Christmas cacti tend to flower around the winter months and produce bright bountiful pink blooms. As exterior plants, they are only hardy in United States Department of Agriculture zones 9 to 11. How cold can Christmas cactus get? Cold hardiness in Christmas cactus is greater than some cacti, but they are tropical. They can’t tolerate frost but they need cold temperatures to force blooms. As a tropical plant, Christmas cacti like warm, balmy temperatures; moderate to low moisture levels; and bright sun. It likes to be warm but keep the plant away from extremes such as drafts, heaters and fireplaces. Perfect nighttime temperatures range from 60 to 65 degrees Fahrenheit (15-18 C.). To force bloom, place the cactus in a cooler area in October where temperatures are about 50 degrees Fahrenheit (10 C.). Once the plants are in bloom, avoid sudden temperature fluctuations which can make Christmas cacti lose their flowers. In summer, it is completely fine to take the plant outdoors, somewhere with dappled light initially and shelter from any wind. If you leave it outside too far into fall, you can expect Christmas cactus cold damage. [图片]How Cold Can Christmas Cactus Get? To answer the question, we need to consider the growing zone. The United States Department of Agriculture provides hardiness zones for plants. Each hardiness zone illustrates the average annual minimum winter temperature. Each zone is 10 degrees Fahrenheit (-12 C). Zone 9 is 20-25 degrees Fahrenheit (-6 to -3 C) and zone 11 is 45 to 50 (7-10 C). So as you can see, the cold hardiness in Christmas cactus is fairly broad. That being said, frost or snow is a definite no-no for the plant. If it is exposed to freezing temperatures for more than a quick nip, you can expect the pads will be damaged. [图片]Treating Christmas Cactus Exposed to Cold If the cactus is out too long in freezing temperatures, the water stored in its tissues will freeze and expand. This damages the cells inside the pads and stems. Once the water thaws, the tissue contracts but it is damaged and doesn’t hold its shape. This results in limp stems, and eventually dropped leaves and rotten spots. Treating Christmas cactus exposed to cold requires patience. First, remove any tissue that appears to be badly damaged or rotten. Keep the plant lightly watered, but not soggy, and place it in an area around 60 degrees F. (15 C), which is moderately warm but not hot. If the plant survives six months, give it some houseplant fertilizer that has been diluted by half once per month during its growth months. If you put it outside the next summer, just remember Christmas cactus cold tolerance doesn’t extend to freezes, so get it inside when those conditions threaten.

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2017年08月17日

Unlike typical desert cacti, Christmas cactus is native to the tropical rain forest. Although the climate is damp for much of the year, the roots dry quickly because the plants grow not in soil, but in decayed leaves in the branches of trees. Christmas cactus problems are usually caused by improper watering or poor drainage. [图片]Christmas Cactus Fungal Issues Rots, including basal stem rot and root rot, are the most common problems affecting Christmas cactus. Stem rot – Basal stem rot, which generally develops in cool, damp soil, is easily recognized by the formation of a brown, water-soaked spot at the base of the stem. The lesions eventually travel up the stem of the plant. Unfortunately, basal stem rot is usually deadly because treatment involves cutting the diseased area from the base of the plant, which removes the supportive structure. The best recourse is to start a new plant with a healthy leaf. Root rot – Similarly, plants with root rot are difficult to save. The disease, which causes the plants to wilt and eventually die, is identified by a wilted appearance and soggy, black or reddish brown roots. You may be able to save the plant if you catch the disease early. Remove the cactus from its pot. Rinse the roots to remove the fungus and trim rotten areas. Repot the plant in a pot filled with a potting mix formulated for cacti and succulents. Be sure the pot has a drainage hole. Fungicides are often ineffective because specific pathogens are difficult to identify, and each pathogen requires a different fungicide. To prevent rot, water the plant thoroughly, but only when the potting soil feels slightly dry. Let the pot drain and don’t allow the plant to stand in water. Water sparingly during the winter, but never let the potting mix become bone dry. [图片]Other Diseases of Christmas Cactus Christmas cactus diseases also include botrytis blight and impatiens necrotic spot virus. Botrytis blight – Suspect botrytis blight, also known as grey mold, if the blooms or stem are covered with silvery gray fungus. If you catch the disease early, removal of infected plant parts may save the plant. Improve ventilation and reduce humidity to prevent future outbreaks. Necrotic spot virus – Plants with impatiens necrotic spot virus (INSV) display spotted, yellow or wilted leaves and stems. Use appropriate insect control, as the disease is usually transmitted by thrips. You may be able to save diseased plants by moving them into a clean container filled with fresh, pathogen-free potting mix.

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2017年08月17日

Christmas cactus is a long-lived plant with bright blooms that appear around the winter holidays. Normally, blooms last at least one to two weeks. If conditions are just right, the impressive flowers may hang around for seven to eight weeks. Although the plant is relatively low-maintenance, dropping or wilting Christmas cactus blooms are usually an indication of improper watering or sudden temperature changes. [图片]Flower Wilt on Christmas Cactus Christmas cactus bloom wilt is often caused by excessively dry soil. Be careful and don’t over-correct, as watering a Christmas cactus can be tricky and too much moisture may cause more serious problems, such as stem or root rot, which are usually deadly. For most of the year, you shouldn’t water the plant until the soil feels slightly dry, and then water deeply so the entire root ball is saturated. Let the pot drain thoroughly before replacing the plant on a drainage saucer. However, it’s important to note that slightly different tactics are needed when the plant begins to bloom. During the blooming period, water just enough to keep the potting mix consistently moist, but never soggy or bone dry. Don’t water deeply during this time, as soggy roots may cause blooms to wilt and drop. Don’t fertilize the plant while it is blooming either. From October on through winter, Christmas cactus prefers cool nighttime temperatures between 55 and 65 F. (12-18 C) during the blooming period. Keep the plant away from cold drafts, as well as fireplaces or heat vents. Christmas cactus also needs relatively high humidity, which replicates its natural, tropical environment. [图片]If the air in your home is dry during the winter months, place the pot on top of a layer of pebbles in a plate or tray, then keep the pebbles moist to increase the humidity around the plant. Be sure the pot is standing on the moist pebbles and not in the water, as water wicking into the soil through the drainage hole can cause the roots to rot.

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2017年08月17日

Christmas cacti are common gifts around the holidays. They tend to bloom in the winter, with showy flowers present for friends and family to admire as they attend winter festivities. The presence of small children and pets at family functions reminds us that not all plants are safe. Is Christmas cactus toxic? Read on to find out and help protect your pets from any Christmas cactus toxicity. [图片]Is Christmas Cactus Toxic? The bright salmon to red flowers and intricate pads are characteristic of the Christmas cacti, which tends to bloom around Christmas and gives them their name. The plant is not a true cactus, however, but an epiphyte. It needs bright light and well-drained soil, with moderate water needs. To ensure blooming, withhold water in October and gradually resume again in November. Good news! Unlike many of the holiday plants, Christmas cactus toxicity is not damaging. Mistletoe, holly (berries) and poinsettia are also common during the winter holidays and do have some toxic components, but it is safe to have the Christmas cactus in your home. It isn’t even spiny, so you don’t have to worry about sharp pointy things hurting mouthy dogs and curious cats. [图片]Care of Christmas Cactus Around Pets Christmas cactus is native to Central and South America. They are classed as Zygocactus, a form of epiphyte that has a similar appearance to traditionally recognized cacti. Epiphytes don’t need a soil based medium to live in but can survive in tree crotches and rocky depressions where organic material has collected and composted down to a rich humic base. Most Christmas cacti are sold in a soil medium which is well-draining. Care of Christmas cactus around pets is similar to that of any tropical plant. They require deep watering followed by allowing the top few inches of soil to dry out before applying moisture anew. The key to achieving bright blooms each year is to allow the plant to dry out in fall and winter. Move the plant to where it receives bright light and ensure temperatures are fairly cool. Ideal temperatures for flowering are 50 degrees Fahrenheit (10 C). Apply a 0-10-10 fertilizer in October to early November and reapply in February. Although, it is best to train animals not to sample plants in the home, no harm will come to them if they want to try a flower or a bite of foliage. Christmas cactus and pets make perfect housemates as long as your animal doesn’t over eat the plant and destroy its health. Christmas cactus and pets can coexist in harmony in the home but preventive measures on other holiday plants should be taken. Place plants, such as poinsettia, up high where animals can’t reach them. If the family pet is especially persistent, spray the plant with cayenne pepper dissolved in water. The spicy taste will make Fido or Kitty think twice about approaching any plant and avoid poisoning but also safeguard the plant from teething damage and foliar death.

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