动态第944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

Fusarium oxyporum is the name of a fungus that can affect a wide range of plants. It’s common in vegetables such as tomatoes, peppers, eggplants and potatoes, but it’s also a real problem with cacti. Keep reading to learn more about signs of fusarium wilt in cactus plants and methods for treating fusarium on cactus. [图片]What is Cactus Fusarium? While the fungus itself is called Fusarium oxyporum, the disease that results from it is commonly known as fusarium rot or fusarium wilt. The disease usually starts in the roots, where cactus fusarium enters through tiny wounds in the plant likely caused by nematodes. The fungus then spreads upward to the base of the cactus, where signs of fusarium wilt in cactus becomes more visible. A pink or white mold appears around the base of the plant, and the entire cactus might start to wilt and become discolored, turning red or purple. If the plant is cut open, it gives off a bad, rotting smell. [图片]Treating Fusarium on Cactus Plants Fusarium rot in cactus has no cure. Therefore, treating fusarium on cactus plants is more about prevention and damage control than it is about rehabilitation. If you find fusarium rot in cactus plants in your garden, you’ll likely have to dig up the plants and destroy them. If you catch it very early, however, you might be able to save the plant by cutting out the infected areas with a sharp knife and dusting the wounds with charcoal or sulphur dust. Cactus fusarium spreads quickly in hot, wet conditions, so try to keep your cacti as dry as possible. Always sterilize pots and use new, sterile soil when planting cacti to reduce the risk of introducing fusarium into its environment.

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2017年08月17日

A terrarium is a rather old-fashioned but charming way to make a mini garden in a glass container. The effect produced is rather like a tiny forest residing in your home. It is also a fun project that is great for kids and adults. Growing succulent plants in terrariums provides the plants with an easy care situation in which they will thrive. Because succulents do not like wet environments, a few tips and adjustments to the traditional terrarium are required. Read on to find out how to make a succulent terrarium that will keep the little plants happy and healthy. [图片]Succulent Terrarium Instructions Terrariums and dish gardens have been a part of indoor growing for centuries. Succulent plants seem to like arid conditions and a desert or beach themed terrarium will provide the right conditions while adding some unexpected appeal in the home. Creating succulent terrariums doesn’t take a lot of time or money. You can literally make one in an old food jar or search a thrift market for an unusual dish or clear container. Then it’s time to plant and add any touches to the diorama. You can make the terrarium as ornate or simple as you wish. The original terrariums were made in elegant Wardian cases, so named for the originator of the idea, Dr. N.B. Ward. Succulents will do well in almost any container. The only trick is to make an open rather than closed system to prevent excess moisture from building up and killing the plant. [图片]Creating Succulent Terrariums The planting medium for succulents is crucial. Succulents are perfect for terrariums because they grow relatively slowly but the condensation that may build up can kill the little plants if the right medium isn’t used. Line the bottom of the container with fine gravel or rocks. On top of this layer an inch or so of charcoal. This absorbs odors and toxins that may be in the water. Next, place sphagnum moss and top it with cactus soil that has been lightly pre-moistened. Plant the little plants in the cactus mix and firm soil around them. A dowel or stick is helpful in digging the holes and filling around plants. Space plants at least an inch apart (2.5 cm.) so there is adequate air flow. Plants may need a Popsicle stick or small stake for the first few weeks to keep them upright. Now the really fun part happens – designing the terrarium. If you want a beach theme, add some seashells or for a desert look, install some rocks to complement the succulents. There is an almost endless supply of items that will enhance the natural look of the terrarium. Some growers even add ceramic figures to add to the sense of whimsy. Just make sure that anything you are putting into the terrarium has been well washed to avoid bringing in disease. [图片]Succulent Terrarium Care Place the terrarium in a brightly lit location but avoid direct sun which can scorch the plants inside. An area near a fan or blower is ideal, as this will increase circulation and help prevent damping off. Succulents can’t stand to be overwatered and if they are in standing water they will surely die. Your succulent garden won’t need to be watered very often. Wait until the soil is nearly completely dry before you water. Use tap water that has been off gassed or purchase purified water. Succulent terrarium care is pretty much the same as care of succulents in a pot. These plants thrive on neglect and don’t need supplemental fertilizer but once per year. Over time the succulents should fill in a bit and the whole terrarium will attain a natural appealing appearance.

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2017年08月17日

Frailea (Frailea castanea syn. Frailea asterioides) are very small cacti that rarely reach 2 inches in diameter. The plants are native to Southern Brazil over to Northern Uruguay. These little cacti are quite interesting in their form but their life cycle is even more surprising. There are several species of this genus available for home growers, but the plants are considered threatened in their native habitat. Learn how to grow a Farilea cactus and add an interesting specimen to your arid garden collection. [图片]Cactus Frailea Information Rounded, flattish mounds of solitary to occasionally divided chocolate, purple-brown or greenish brown Frailea make interesting contrasts to other succulents. This genus is named for Manuel Fraile, who once was in charge of the cactus collection of the United States Department of Agriculture. Growing cactus Frailea is not difficult and these little plants are super starter plants for the novice gardener or just for someone who travels consistently but wants to come home to a living thing. Frailea cactus care is one of the simpler cultivation processes in the plant world. The majority of these plants grow as solitary little flattened domes. The spines are extremely tiny and arrayed along the ribs. The body of the plant may range from chocolate to reddish green with several other color variations possible. Often, the plant will produce a fuzzy white fruit that dries to a fragile, membranous capsule filled with large seeds. This fruit is often a surprise as flowers are rare and are cleistogamous, meaning they don’t need to open to produce fruit and seed. If you are lucky enough to observe a full bloom, the flower will be larger than the body of the plant and rich sulfur yellow. Growing cactus Frailea is easy from seed as germination is quick and reliable. [图片]How to Grow a Frailea Cactus Frailea perform best in full sun but be cautious about placing them too close to a southern window where the flesh can burn. The tone of the cactus is darkest when it enjoys a full day of sunlight. This is a short lived plant that rarely exceeds 15 years before it dies back. Here’s a fun bit of cactus Frailea information. If plants are growing where no water is available, they have the interesting ability to hide in the soil. Don’t be shocked if your plant seems to have disappeared, as it is simply retracted under the soil just as it would do in the dry season in its native region. Once sufficient moisture is available, the plant swells and is again visible on the top of the soil. [图片]Caring for Cactus Frailea Caring for cactus Frailea is a balancing act between sufficient moisture but periods of soil drying, so water is the biggest challenge in Frailea cactus care. Choose water that is free from heavy minerals. Water well once per week in summer, but in spring and autumn water only once every 3 weeks or when the soil is quite dry to the touch. The plant experiences no growth in winter and does not need water. Once per month during the growing season use diluted cactus food. In summer, you can bring your indoor specimens outside but be careful to bring them back indoors before any cold temperatures threaten. Repot every few years with a good gritty succulent soil. Plants rarely need a larger pot and are quite content to be crowded. If you spot a seed pod, crack it open, sow seed in a flat with cactus mix and keep moderately moist in a sunny location. The ease of growing cactus Frailea is a welcome surprise and is a simple way to increase your collection.

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2017年08月17日

Fishbone cactus boasts many colorful names. Ric Rac, Zigzag and Fishbone orchid cactus are just a few of these descriptive monikers. The names refer to the alternate pattern of the leaves along a central spine that resembles a fish skeleton. This stunning plant is an epiphytic specimen that can grow in low soil situations where other organic media are present. Growing fishbone cactus is easy even for the so-called “black thumb” gardener. Bring in a fishbone cactus houseplant and enjoy the crazy zigzag pattern of its succulent foliage. [图片]Fishbone Cactus Info The scientific name for the plant is Cryptocereus anthonyanus (syn. Selenicereus anthonyanus), and is a member of the night blooming cactus family. Best known for its long, arching stems coated with serrated leaf nodes, fishbone cactus is found in its habitat in groups, which hang from trees. The plant originates in Mexico, where tropical rainforests create a moist, humid environment. It is commonly found in garden centers as Ric Rac cactus or sometimes orchid cactus. Rarely the plant will bloom with soft pink flowers that open at night and last only one day. Fishbone cactus houseplant enjoys similar growing conditions as its cousin, the orchid. [图片]Growing Fishbone Cactus Houseplants The trailing stems offer an interesting feature for the home landscape. Choose a basket or unglazed pot for the cactus to enhance evaporation and prevent the plant from getting too wet. You can do a hanging basket, tabletop display or terrarium installation. Either way, the fishbone cactus will enhance and entertain. Use gloves when handling the plant, since it has tiny fine hairs, which will stick into skin and cause discomfort. [图片]Fishbone Cactus Care Novice gardeners could not ask for an easier plant than a fishbone cactus houseplant. The cactus grows in low soil media, such as orchid substrate. You can also plant it in cactus blend mixed with compost to enrich the medium. Fishbone cactus thrives in indirect light but can tolerate periods of bright sun. Like most cacti, fishbone cactus houseplant does best when allowed to dry out between watering. During winter, cut watering in half and then reinstate when spring growth begins. Fertilize with a water-soluble cactus or orchid fertilizer in early spring. You can place your plant outside in spring and summer but do not forget to bring it in when temperatures cool. Best of all, the cactus will stand some neglect, so do not worry about it when you go on vacation. [图片]Propagating Fishbone Cactus This is one of the easiest cactus plants to propagate and share with your family and friends. You just need a piece of stem to start an entirely new plant. Take a fresh cutting and let it callus on the counter for a few days. Insert the callused end into a low soil medium, such as peat moss mixture. That is pretty much all there is to it. Provide light moisture and medium light when growing Fishbone cactus stems. Soon you will have new plants to spread to your gardening family.

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2017年08月17日

Cereus tetragonus is native to North America but is only suited for cultivation outside in USDA zones 10 to 11. The fairy castle cactus is the colorful name by which the plant is marketed and refers to the numerous vertical stems of different heights that resemble spires and turrets. The plant is a succulent with spines that bloom yellow infrequently. Growing fairy castle cactus inside your home is an easy beginning gardener project. These delicately limbed cacti provide all the charm of the fairy tale castles for which they are named. [图片]Fairy Castle Cactus Classification Some expert classify the cactus as a form of Acanthocereus tetragonus. It has also been given the species name hildmannianus in the genus Cereus. The susbspecies is the real puzzler. Fairy castle cactus is either in the subspecies uruguayanus or monstrose. Whichever scientific name is correct, the plant is a delightful little cactus for your home. [图片]Information About Fairy Castle Cactus Plant Cereus tetragonus is native to North, South and Central Americas. It is a very slow growing plant that will eventually reach 6 feet tall. The stems on fairy castle cactus plant are five sided with wooly based spines along each plane. The limbs are a bright green turning woody and brown with age. Different branches are formed over time which slowly lengthen and produce an interesting silhouette. The fairy castle cactus rarely blooms. Cacti need perfect growing conditions to produce flowers and the plants in the Cereus family bloom at night. Fairy castle cactus flowers are large and white and usually will not occur until the plant is ten years old or more. If your cactus comes with a flower, examine it carefully. It is likely a fake bloom used as a marketing ploy. There is no need to remove the fake fairy castle cactus flower, as it will fall off by itself eventually. [图片]Fairy Castle Cactus Care Fairy castle cactus is a full sun plant that requires well drained soil. Plant the cactus in an unglazed clay pot that allows excess moisture to evaporate. The fairy castle cactus plant will grow best in a good cactus potting soil or you can make your own. Mix one part potting soil with one part each of sand and perlite. This will make a good gritty medium for the cactus. Place the little cactus in a bright sunny location that is away from drafts or air conditioning. When you water, water until the liquid comes out of the drainage holes and then allow the soil to completely dry out before irrigating. Fairy castle cactus care is easiest in winter when you can cut in half the amount of water the plant receives. Fertilize with a good cactus fertilizer in spring when growth resumes. Feed monthly or with irrigation in a dilution that is half strength. Suspend the feeding in winter.

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2017年08月17日

You’ve probably seen the mole plant euphorbia blooming in pastures or meadows, sometimes in a yellow mass. Of course, if you’re not familiar with the name, this may leave you wondering, “What is a mole plant?” Read on to find out more. [图片]About Mole Plants Botanically the mole plant is called Euphorbia lathyris. Other common names are caper spurge, leafy spurge and gopher spurge. Caper spurge mole plant is either an annual or biennial plant that exudes latex when cut or broken. It has cup-shaped greenish or yellow flowers. The plant is upright, leaves are linear and bluish green in color. Unfortunately, all parts of mole spurge plant are poisonous. Please don’t mistake it for the plant that produces capers, as some have, since the poison in the caper spurge mole plant can be quite toxic. Despite its toxicity, various parts of the mole spurge plant have been used medicinally through the years. The seeds were used by French peasants as a purgative, similar to castor oil. Folklore about mole plants says the latex has been used for cancers and warts. Further information about mole plants says it is a Mediterranean native, brought to the United States for use of repelling rodents in orchards and various other agricultural locations. The mole spurge plant escaped its boundaries and self-seeded rampantly on both the east and west coasts of the U.S. [图片]Mole Spurge Plant in Gardens If the mole plant euphorbia is growing in your landscape, you may be one of the recipients of self-seeding. Spread may sometimes be controlled by removing flower heads before they go to seed. If you’ve noticed a decline in bothersome rodents or moles in your landscape, you may thank mole plant euphorbia and continue to let it grow. Each gardener will have to decide if the mole spurge plant is an effective repellant plant or a noxious weed in their landscape. The mole plant euphorbia is not likely to be considered an ornamental by most gardeners or by information about mole plants. Learning more about mole plant can help you control it should you decide it is not needed as a repellant plant. Control of mole plant can be as simple as digging plants by the roots before they go to seed. Now you’ve learned what is mole plant and useful information about mole plant, including its uses.

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2017年08月17日

Euphorbia is a large group of succulent and woody plants. Euphorbia obesa, also called baseball plant, forms a ball-like segmented shape that is adapted to hot, arid climates. Euphorbia baseball plant makes an excellent houseplant and is low maintenance. Enjoy this information on how to grow baseball euphorbia. [图片]Euphorbia Baseball Plant Info There is a wide array of Euphorbia species. They range from cactus-like spiny plants to thickly padded succulents and even shrubby, woody plants with veined leaves. Baseball plant was first documented in 1897, but by 1915 Euphorbia obesa was considered endangered due to its popularity, which led collectors to pirate the natural population. This rapid decline in the population led to an embargo on plant material and an emphasis on seed collection. Today, it is a widely grown plant and easy to find in many garden centers. Euphorbia plants are classified by their white milky latex sap and the cyanthium. This is the inflorescence composed of a single female flower surrounded by many male flowers. Euphorbia do not form proper flowers but develop inflorescences. They do not grow petals but instead have colored bracts which are modified leaves. In the baseball plant, the inflorescence or flower leaves behind a scar which is successively displayed on the aging body of the plant. The scarring is similar to the stitching on a baseball. Euphorbia baseball plant is also called sea urchin plant, partially due to the shape of the body, which resembles the creature, but also due to the native habit of growing on rocks and cliffs. Specific baseball plant info indicates it is a segmented spherical plant with a rather bloated body that stores water. The round plant is grayish green and grows around 8 inches tall. [图片]How to Grow Baseball Euphorbia Euphorbia obesa care is minimal, making it the perfect houseplant for someone who travels a lot. It simply requires heat, light, a well draining soil, container, and minimal water. It makes a perfect container plant by itself or surrounded by other succulents. A good cactus mix or potting soil amended with grit make excellent mediums for growing a baseball plant. Add a little gravel to the soil and use an unglazed pot which will promote evaporation of any excess water. Once you have the plant in a location in your home, avoid moving it which stresses out the plant and can minimize its health. Overwatering is the most common cause of malaise in baseball plant. It is used to only 12 inches of rain per year, so a good deep watering once every few months in winter and once per month in the growing season is more than sufficient. Fertilizing is not necessary as part of good Euphorbia baseball care, but you can give the plant cactus food in spring at the onset of growth if you wish.

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2017年08月17日

Dragon bone cactus is technically a succulent not a cactus. It is in the family Euphorbia or Spurge, a broad group of plants that include poinsettias and cassava. The cactus also has several other names, among them candelabra cactus, false cactus, elkhorn and mottled spurge. In northern zones, caring for dragon bone plants will require you to grow it in a greenhouse, solarium or in a sunny room. Dragon bone euphorbia is an elegant and structurally unique plant that can also live on the patio in summer as long as it is brought indoors before cool temperatures arrive. [图片]Dragon Bone Euphorbia Gardeners with unusual taste will go nuts for dragon bone cactus (Euphorbia lactea). The triangular branches form an eclectic scaffold upon which tiny green heart-shaped leaves and numerous reddish pink spines occur. This succulent produces latex milky sap, which may be toxic to some gardeners, so it is best to use gloves when handling broken stems. Here are a few tips on how to grow dragon bones as an in-ground plant or potted specimen for the home interior. Dragon bone is indigenous to India but can be grown in United States Department of Agriculture zones 10 and 11. The plant may achieve 6 feet tall by 3 feet wide in containers but exceeds that in the ground, growing up to 12-15 feet in height. The tiny leaves fall off as the spines are produced and are only present on new growth. Overall the plant is leafless, thorned and has numerous vertical branches rising from a stout central leader. The branches are mottled green with white lines. Flowers are rare, tiny and inconspicuous. Propagation is best accomplished through stem cuttings. [图片]These must be allowed to callus before planting. How to Grow Dragon Bones Northern gardeners will do best if they plant the cactus in a well-draining pot. Choose a container that will evaporate excess moisture, such as a clay pot. Use a cactus soil mix or add gritty sand and pebbles to a commercial plant formula. This euphorbia doesn’t mind being crowded in its pot. In-ground plants benefit from added grit or install the plant in a rocky area of the garden that has mixed loam. Dragon bone prefers full sun with some protection from the midday light. Propagation of dragon bone is simple through stem cuttings. Use a sterile, sharp implement and allow to dry out for a few days and callus at the cut end. Use a soilless mixture to root the cuttings. Keep lightly moist but not soggy. Once the cutting has developed roots, transfer to a container with cactus mix. [图片]Caring for Dragon Bone Plants As part of dragon bone plant care, you should water regularly, at least once per week in the growing season, but allow soil to dry out in the top few inches. Do not allow the roots to stand in water. In the winter, water once per month to allow for the dormant period. Prune the plant as needed to remove errant stems or keep it in a tidy habit. Use gloves when handling the plant to avoid contact with the toxic sap. Use insecticidal soap to control the occasional pests such as mealybugs, aphids, and spider mites. Every two weeks in the growing season use water soluble fertilizer diluted to half for potted plants. Suspend feeding in fall and winter. In-ground plants should also be fertilized with a half dilution, which will replace the regularly scheduled irrigation. Dragon bones is a distinctive plant that is easy to care for and both drought and deer resistant. Try it in your home or landscape for matchless appeal and evocative design.

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2017年08月17日

The genus Euphorbia boasts a number of fascinating and beautiful plants, and the Medusa’s Head euphorbia is one of the most unique. Medusa’s Head plants, native to South Africa, grow numerous grayish-green, snake-like branches extending from a central hub that keeps the twisty, leafless branches supplied with moisture and nutrients. In perfect conditions, the plants can measure as much as 3 feet across, and yellowish-green blooms appear around the hub in spring and summer. Want to learn how to grow a Medusa’s Head? Read on. [图片]How to Grow a Medusa’s Head Euphorbia You may be lucky enough to find Medusa’s Head plants (Euphorbia caput-medusae) at a garden center that specializes in cacti and succulents. If you have a friend with a mature plant, ask if you can have a cutting to propagate your own plant. Let the cut end dry for a few days to develop a callus before planting. Medusa’s Head euphorbia is suitable for growing outdoors in USDA hardiness zones 9b through 11. Euphorbia requires at least six hours of direct sunlight per day and tolerates temperatures in the low 90s (33-35 C.). However, afternoon shade is beneficial in hotter climates, as extreme heat may stress the plant. Well-drained soil is absolutely critical; these plants are likely to rot in soggy soil. This fascinating plant also does well in pots, but requires a well-drained potting mix such as a mixture of pumice, coarse sand and potting soil. [图片]Euphorbia Medusa’s Head Care Although Medusa’s Head is drought tolerant, the plant benefits from regular moisture during summer and won’t tolerant long periods of drought. In general, one watering every week or so is enough. Again, be sure the soil drains well and never allow the soil to become waterlogged. Medusa’s Head plants in containers shouldn’t be watered during the winter months, although you can water the plant very lightly if it begins to look shriveled. Fertilize the plant monthly during spring and summer, using a water-soluble fertilizer mixed to half strength. Otherwise, caring for Medusa’s Head isn’t complicated. Watch for mealybugs and spider mites. Be sure the plant isn’t crowded, as good air circulation can prevent powdery mildew. Note: Be careful when working with Medusa’s Head plants. Like all Euphorbia, the plant contains sap that can irritate eyes and skin.

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2017年08月17日

Euphorbia plants (Euphorbia spp.) also go by the easier to say, but less elegant, name of Spurge. They are a family of plants that may be grown as houseplants or occasionally outdoors. There are many varieties of Euphorbia plants, with fascinating forms that range from shrubs, herbs, or cactus-like specimens. Growing Euphorbias is easy and some are hardy in temperate climates. These are easy to start from seed and propagate from cuttings. Learn how to cultivate a Euphorbia plant that will start conversations and cause second looks. [图片]About Euphorbia Plants Euphorbias occur naturally in many parts of the world, but most notably Africa, Asia, Europe and North and South America. The variation of form and size provide a spectacle of plant life. Some are as large as trees and others range as small ground covers. There are over 2,000 species, many of which you will find familiar from interior commercial plantings. Crown of thorns is recognizable by its spiky stems, and donkey spurge is aptly named with thick rope-like stems sprawling away from the plant. Poinsettias are a form of Euphorbia that is recognizable to almost everyone. Most varieties of Euphorbia plants produce weird and unusual flowers. Gardeners should be cautious when handling Spurge, as all varieties have a milky latex sap that can be irritating or even poisonous. [图片]How to Cultivate a Euphorbia Plant As a general rule, Spurge requires well-drained soil in full sun. A few tolerate shadier conditions, but none of the family is fussy about soil condition. They even thrive in very poor soils and can tolerate periods of drought. Euphorbia plant care is simple. Provide them light, moderate moisture and watch for annoying pests, like whitefly. Provide water under the plant’s leaves to prevent powdery mildew. You will not need to fertilize Spurge often. Wait until the bottom leaves become yellow before feeding with a water-soluble plant food. Prune when the plant gets out of hand. These plants are almost impossible to kill and are a perfect choice for the novice gardener. Growing Euphorbia to share with a friend is also a great beginner propagation project. [图片]Additional Growing Tips for Euphorbia Spurge grows quite well from seeds sown indoors in pots. You can propagate Euphorbia more quickly and easily by gathering up the “volunteers” around an established plant. You may also root stem cuttings in a soilless medium, such as peat. Keep them lightly misted and enclose the pot in a bag to keep moisture in. Let the pot breathe once a day for an hour, so the soil does not mold. Once the cutting has rooted, you can pot it in regular soil or plant outdoors in moderate climates. One of the more important growing tips for Euphorbia is to let the stem cutting dry for a few days before planting. This allows the sap to form a callus on the cut end and prevents rotting. Whether you want a giant thornless cactus specimen 6 feet tall or a creeping, sweetly flowering ground cover, you should try growing Euphorbias. They reward the gardener with more than just good looks, but remind us all of the variety and beauty found in nature.

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