动态第484页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2017年10月01日

Scientific Name Cotyledon tomentosa Harv. Common Names Bear’s Paw Synonyms Cotyledon tomentosa subsp. tomentosa Scientific Classification Family: Crassulaceae Subfamily: Sedoideae Genus: Cotyledon[图片]Description Cotyledon tomentosa is a succulent shrublet, up to 20 inches (50 cm) tall, densely branched. The leaves are flat, succulent and hairy, up to 1.5 inches (3.5 cm) long with 3 – 10 (often reddish) teeth, arranged in a neat row. There are bright green forms with yellowish hairs and grey ones with whitish hairs. The bell-shaped flowers are light yellow, orange to orange-red or pinkish in color.[图片]Hardiness USDA hardiness zone 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C). How to Grow and Care Cotyledons can be divided into two groups. One group consists of evergreen plants with a summer growing period. The other group is made up of deciduous plants, splendidly magnificent with large, solid fleshy stems. The second group grows during the winter, and sheds its leaves during the summer. Cotyledons require a free-draining gritty mix and plenty of sun. They are tolerant of cool, frost-free conditions during the winter if kept dry. Some require pruning to maintain an attractive shape. Cotyledons should be kept in a sunny position. Follow general succulent watering procedures. Be careful of over-watering when they are deciduous.[图片]As succulents go, Cotyledons certainly are rewarding garden and indoor subjects, practically independent of irrigation in all but full desert conditions, though they cannot survive poor light or bad drainage in the wet.

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2017年10月01日

Scientific Name Cotyledon tomentosa subsp. ladismithiensis (Poelln.) Toelken Common Names Bear’s Paw Synonyms Cotyledon ladismithiensis Scientific Classification Family: Crassulaceae Subfamily: Sedoideae Genus: Cotyledon[图片]Description Cotyledon tomentosa subsp. ladismithiensis is a succulent shrublet up to 12 inches (30 cm) high (40 inches / 1 m, including the flower stems), densely branched, covered with hairs. The leaves are oblong-elliptic or almost cylindrical, yellow-green, sometimes the tips being reddish, up to 2 inches (5 cm) long, with 1-3 apical teeth. More numerous small teeth may be apparent at first, but these seem to disappear as the leaf matures. The flowers are orange-red to almost yellow in color.[图片]Hardiness USDA hardiness zone 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C). How to Grow and Care Cotyledons can be divided into two groups. One group consists of evergreen plants with a summer growing period. The other group is made up of deciduous plants, splendidly magnificent with large, solid fleshy stems. The second group grows during the winter, and sheds its leaves during the summer. Cotyledons require a free-draining gritty mix and plenty of sun. They are tolerant of cool, frost-free conditions during the winter if kept dry. Some require pruning to maintain an attractive shape. Cotyledons should be kept in a sunny position. Follow general succulent watering procedures. Be careful of over-watering when they are deciduous.[图片]As succulents go, Cotyledons certainly are rewarding garden and indoor subjects, practically independent of irrigation in all but full desert conditions, though they cannot survive poor light or bad drainage in the wet.

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2017年10月01日

Scientific Name Yucca rostrata Engelm. ex Trel.[图片]Common Names Beaked Yucca, Big Bend Yucca Synonyms Yucca linearis, Yucca rostrata var. linearis Scientific Classification Family: Asparagaceae Subfamily: Agavoideae Genus: Yucca[图片]Description Yucca rostrata is a slow-growing, tree-like Yucca with upright stems and beautiful gray-blue narrow foliage. Although it can branch, it is most often seen with a single trunk, that can grow up to 15 feet (4.5 m) tall. The 2 foot long (60 cm), stiff, slightly waxy, pale bluish-green leaves with yellow margins, form a dense rosette on top of the stems. The old leaves fall off leaving a fibrous soft gray covering on the trunk. Large clusters of white flowers bloom on yellow-orange colored stalks that rise above the foliage on mature plants in late spring.[图片]How to Grow and Care Under the right conditions, Yucca are not difficult plants to grow. They tend to thrive on a little neglect, rather than too much attention. They are especially easy to overwater, and soggy stems are a sign of too much water. The best conditions for Yucca include a sunny corner with relatively low humidity. They are not prone to many pests, although scale can be an issue. Over time, plants will typically lose their lower leaves (in nature, they droop, forming a skirt around the trunk), giving the plant a pleasant “tree-like” appearance.

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2017年10月01日

Scientific Name Crassula rupestris Thunb. Common Names Kebab Bush, Concertina Bush, Bead Vine, Rosary Vine[图片]Synonyms Crassula rupestris subsp. rupestris, Crassula monticola, Purgosea rupestris Scientific Classification Family: Crassulaceae Subfamily: Crassuloideae Genus: Crassula[图片]Description Crassula rupestris is a much-branched, succulent, perennial subshrub, up to 12 inches (30 cm) tall and wide (up to 3 feet/1 m tall in nature). The stems are thin, fleshy near the growing tip, but rather woody lower down. Leaves are small, thick, opposite, ovate and lanceolate in shape, up to 1 inch (2.5 cm) long and grayish in color (during the summer months the leaf margins turn a brilliant red or yellow). Flowers are grouped in clusters, deep pink to pale pink, star-shaped and up to 0.25 inch (6 mm) across.[图片]Hardiness USDA hardiness zone 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C). How to Grow and Care Crassula are easy to grow, but they are susceptible to mealy bugs and fungal diseases. As with all succulents, overwatering is sure to be fatal, so err on the side of too dry rather than too wet. Never let your Crassula sit in water. If you water from beneath by letting the plant sit in a saucer of water, make sure to pour off any excess water after a few minutes.[图片]Crassula are generally started by division, offsets or leaf cuttings. Plants can be easily propagated from a single leaf: sprout leaves by placing them into a succulent or cacti mix, then covering the dish until they sprout.

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2017年10月01日

Scientific Name Crassula rupestris var. monticola Common Names Rosary Vine, Kebab Bush, Concertina Bush, Bead Vine [图片]Synonyms Crassula monticola Scientific Classification Family: Crassulaceae Subfamily: Crassuloideae Genus: Crassula [图片]Description Crassula rupestris is a much-branched, succulent, perennial subshrub, up to 12 inches (30 cm) tall and wide (up to 3 feet/1 m tall in nature). The stems are thin, fleshy near the growing tip, but rather woody lower down. Leaves are small, thick, opposite, ovate and lanceolate in shape, up to 1 inch (2.5 cm) long and grayish in color (during the summer months the leaf margins turn a brilliant red or yellow). Crassula rupestris var. monticola is a wonderful variety with slightly smaller, thick, rounded leaves. Flowers are grouped in clusters, deep pink to pale pink, star-shaped and up to 0.25 inch (6 mm) across. [图片]Hardiness USDA hardiness zone 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C). How to Grow and Care Crassula are easy to grow, but they are susceptible to mealy bugs and fungal diseases. As with all succulents, overwatering is sure to be fatal, so err on the side of too dry rather than too wet. Never let your Crassula sit in water. If you water from beneath by letting the plant sit in a saucer of water, make sure to pour off any excess water after a few minutes. [图片]Crassula are generally started by division, offsets or leaf cuttings. Plants can be easily propagated from a single leaf: sprout leaves by placing them into a succulent or cacti mix, then covering the dish until they sprout. Repot as needed, preferably during the warm season.

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2017年10月01日

Scientific Name Braunsia maximiliani (Schltr. & Berger) Schwantes Common Names Beads Lampranthus Synonyms Mesembryanthemum maximiliani (basionym), Echinus maximiliani, Lampranthus maximiliani, Mesembryanthemum apiculatum var. muticum, Mesembryanthemum phillipsii[图片]Scientific Classification Family: Aizoaceae Subfamily: Ruschioideae Tribe: Ruschieae Genus: Braunsia[图片]Description Braunsia maximiliani is a compact, creeping, perennial, succulent shrublet. It blooms early in the year with quite large rose colored flowers. The branches are trailing and rooting at nodes, up to 7 inches (17.5 cm) long. The leaves are fused for a third of their length, trigonous, boat-shaped, grey-green and up to 0.4 inch (1 cm) long. It flowers in late winter. The flowers are solitary and terminal, raised above the plant, pink and up to 0.9 inches (2.2 cm) in diameter.[图片]Hardiness USDA hardiness zone 9a to 11b: from 20 °F (−6.7 °C to 50 °F (+10 °C). How to Grow and Care Braunsias are moderately slow growing succulents. Needs moderate water when growing in late fall and early spring. Keep somewhat dry the rest of the time. Like all living rocks, they thrive in porous soils with excellent drainage. It can tolerates high heat and some frost (hardy to 23° F (-5° C) or less if very dry). Braunsias are very rewarding succulents and can be cultivated in desert garden in warm climates or in greenhouses or windowsills in the home where too hardy. Enjoy bright shade in summer and full sun on the other seasons.

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2017年10月01日

Scientific Name Kalanchoe manginii Raym.-Hamet & H. Perrier Common Names Chandelier Plant, Beach Bells Synonyms Bryophyllum manginii Scientific Classification Family: Crassulaceae Subfamily: Sedoideae Tribe: Kalanchoeae Genus: Kalanchoe[图片]Description Kalanchoe manginii is an evergreen succulent perennial growing up to 12 inches (30 cm) tall and wide, with arching branches of rounded, glossy leaves. It bears few flowered, cyme like panicles of tubular, urn-shaped, red flowers, up to 1.2 inches (3 cm) or more long.[图片]How to Grow and Care Kalanchoes are not particularly hard to grow, and the flowering varieties are highly rewarding for their colorful and long-lasting flowers. They prefer bright, sunny locations, especially in the summer growing season. During the winter, consider a south-facing window. Water moderately throughout the summer and reduce watering in the winter. Let the soil surface dry out between waterings, and in the winter, the plant can almost dry out. Watch the fleshy leaves for signs of water distress. They prefer warmth. Do not let fall below 55ºF (12.7ºC). An ordinary potting soil mix is fine. Feed bi-weekly in the summer with a liquid fertilizer, or use slow-release pellets.

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2017年10月01日

Scientific Name Euphorbia obesa Hook. Common Names Basketball, Sea Urchin, Baseball, Living Baseball, Baseball Plant, Gingham, Golf Ball, Vetmensie, Klipnoors[图片]Scientific Classification Family: Euphorbiaceae Subfamily: Euphorbioideae Tribe: Euphorbieae Subtribe: Euphorbiinae Genus: Euphorbia[图片]Description Euphorbia obesa is a spineless, grey-green, dwarf, spherical succulent plant with transverse red-brown or purplish bands. It can grow up to 8 inches (20 cm) tall and up to 3.5 inches (9 cm) in diameter. Rudimentary, caducous leaves. Usually 8, vertical, broad, slightly raised ribs with shallow furrows in between. Small inflorescence borne on short peduncle from stem apices. Female and male flower are born on different plants. The fruit is a slightly three angled capsule, up to 0.3 inch (7 mm) in diameter.[图片]Hardiness USDA hardiness zone 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C). How to Grow and Care Euphorbias are very easy to care for. They require a little pampering to become established, but once they are, they are self-sufficient. In fact, more die from too much care and watering than from neglect. Euphorbias need well-draining soil and lots of sunlight. They are not particular about soil pH, but they cannot tolerant wet soil. Unlike most succulents, Euphorbia does not handle long periods of drought well. It may need weekly watering during the summer. Water whenever the soil is dry several inches below the surface. Water deeply, but don’t let them sit in wet soil, which can cause root rot. Add some organic matter or fertilizer to the planting hole. If you are growing them in containers or your soil is poor, feed with a half-strength fertilizer monthly.[图片]Euphorbia can be grown from seed, but they can be difficult to germinate (or even find). It is usually propagated by cuttings. This can be tricky, because of the exuding sap.

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2017年10月01日

Scientific Name Senecio barbertonicus Klatt Common Names Succulent Bush Senecio, Barberton Senecio, Barberton Groundsel[图片]Scientific Classification Family: Aizoaceae Subfamily: Asteroideae Tribe: Senecioneae Subtribe: Senecioninae Genus: Senecio[图片]Description Senecio barbertonicus is an evergreen succulent bush, up to 6 feet (2 m) tall and wide, with a fleshy, cylindrical, finger-like, light green leaves that point upwards along the branches and are crowded toward stem tips, up to 4 inches (10 cm) long and 0.4 inch (1 cm) in diameter. The flowers are yellow, up to 3 inches (7.6 cm) long and 0.4 inch (1 cm) in diameter.[图片]How to Grow and Care Established plants are extremely drought tolerant. They do need some water, during the summer, but do not leave the soil wet for prolonged periods. Allow the soil to dry out between waterings in the winter, when they are somewhat dormant. Since they are growing in sandy soil, nutrients will need to be replenished. Fertilize annually, but lightly. Too much fertilizer will cause a lot of leggy growth.[图片]Taller varieties can get floppy. You can prune them back to where the stem is firm, in very early spring. You can even root the cuttings. Plants can be divided or repotted in early spring. If you are growing them in containers, they enjoy spending the summer outdoors. Wait until there is no danger of frost and move them back indoors in the fall.

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2017年10月01日

Scientific Name Acanthocereus tetragonus (L.) Hummelinck Common Names Barbed Wire Cactus, Sword Pear, Triangle Cactus, Dildo Cactus, Night-Blooming Cereus[图片]Synonyms Cactus tetragonus (basionym), Cereus tetragonus, Acanthocereus pentagonus, Acanthocereus pitajaya, Cactus pitajaya, Cereus pitajaya, Cactus pentagonus, Cereus pentagonus, Cereus pentagonus, Cactus pentagonus, Cereus acutangulus, Acanthocereus acutangulus, Cereus princeps, Acanthocereus princeps, Cereus princeps, Cereus variabilis, Acanthocereus floridanus, Acanthocereus colombianus, Cactus prismaticus, Cereus prismaticus, Cactus reptans, Cereus reptans[图片]Scientific Classification Family: Cactaceae Subfamily: Cactoideae Tribe: Echinocereeae Genus: Acanthocereus[图片]Description Acanthocereus tetragonus is a tall, columnar cactus, up to 23 feet (7 m) tall. The stems are dark green with 3 – 4 (5) angles and up to 3 inches (8 cm) in diameter. Areoles are grey, up to 1.2 inches (3 cm) from each other. Central areoles have 1 – 2 (3) spines up to 1.6 inches (4 cm) long. Radial areoles have 6 – 8 (10) spines up to 1 inch (2.5 cm) long. The flowers are up to 8 inches (20 cm) in diameter with a tube, up to 6 inches (15 cm) in length. Outer tepals are greenish-white, inner tepals are pure white, and pistils are creamy white. The shiny, red fruits are up to 2 inches (5 cm) long.[图片]Hardiness USDA hardiness zone 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C). How to Grow and Care Like most cacti, Cereus are fairly low-maintenance and hardy. Make sure they receive enough water without becoming waterlogged, especially during the summer, and fertilize them for best results. If the roots have become black or overly soft, the cactus could be experiencing root rot – cut away the affected parts and replant. Like all cacti, give them lots of direct sunlight, especially during the summer.

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