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Miss Chen
2017年12月25日
Miss Chen

龙血树形态优美，点缀家居，效果不凡。龙血树株形优美规整，叶形叶色多姿多彩，为现代室内装饰的优良观叶植物，中、小盆花可点缀书房、客厅和卧室，大中型植株可美化、布置厅堂，龙血树对光线的适应性较强，在阴暗的室内可连续观赏2-4周，明亮的室内可长期摆放，用于家具摆设也是一流的选择。
龙血树叶子发黄的几种原因 长期没有换盆 虽然龙血树是生命力很强的长寿爷，但是你要长期把它当捡来的孩子养着，它也难受啊！ 长期不换盆，植物根系的生长空间不足，吸收营养的能力下降，植株状况变差，叶片发黄就成了顺其自然而然的事情了。 换盆时伤到了根 很多时候，有的伤害是无法避免的，谁能够保证我一锄头挖下去能挖出个完整的土豆来？ 换盆也一样，总是竭尽全力地小心了，然而并没有什么用，还是会伤害到根系。伤到根系之后，上盆的龙血树不能进行正常的养护，需要等它缓苗。 缓苗的过程中，就会出现叶片发黄，甚至掉落的情况。 水肥管理不当 龙血树新叶发黄，是水分不够，如果是老叶发黄，就是养分不够。 空气干燥，也会导致叶片水分缺乏而发黄。 病虫害的妨碍 出现大面积的叶片掉落，可能是根系腐烂或者虫害妨碍。这时候，要检查一下根系的情况，再检查叶片有没有虫卵。 龙血树叶片发黄怎么办 换盆 龙血树可2-3年换盆一次，盆尽量选择稍微大些的，给足生长空间，束缚，永远不会有茁壮成长的植物出现。 换盆时，不是尽力避免伤及根系，而是竭尽全力避免伤及根系，尽到了责任，还是伤到了，那就让它自己缓苗吧，没事的，它很强！ 浇水施肥齐头并进 龙血树除了冬天无需施肥外，春夏秋可薄而勤施。盆土保持湿润，必要时可向叶面喷水，向植株上方喷雾，增加空气湿度。 长期放在阴凉处养护的龙血树也可以适当晒晒太阳，进行一下光合作用，闻闻阳光的味道。 病虫害的出现不能忍 病虫害的出现，一定要及时检查，及时喷药，及时挽救那些还没有发黄的叶片。 对症下药逐一解决，相信你的龙血树又能生龙活虎！
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Miss Chen
2017年12月25日
Miss Chen

春兰以高洁、清雅、幽香而著称，叶姿优美，花香幽远。自古以来，春兰都被誉为美好事物的象征，已广泛在民间人格化了。春兰对社会生活与文化艺术发生了巨大的影响。父母以兰命名以表心，画家取兰作画以寓意，诗人咏兰赋诗以言志。春兰的形象和气质久已深入人心，并起着潜移默化的作用。古代舞剧以“兰步”、“兰指”为优美动作，把优秀的文学作品和书法作品称为“兰章”，把真挚的友谊叫做“兰交”，把人的芳洁、美慧喻为“兰心蕙 质”。又把杰出人物的去世比作“兰摧玉拆”。春兰在中国人民心目中，已经成为一切美好事物的寄寓和象征。
春兰叶子发黄原因分析 1.叶色泛黄，生长正常：是光照过强。 2.叶色变黄，新芽较小：光照过度，缺少氮肥和必要的湿度。 3.老叶黄化脱落：正常老化或翻盆引起。 4.老叶快速黄化脱落：浇水过多太勤、翻盆栽种不当。 5.新叶先端灼焦：施肥过量，栽植材料不清洁。 6.新叶和老株均焦尖呈黑色：盆内湿热过度，根系中有烂根。 7.新芽出土后又停止生长：新芽旁有烂根或不洁之物，翻开新芽周围殖材，清除不洁物即恢复生长。 8.叶片上有焦斑，周缘无黄色：烈日烧灼斑。 9.叶端出现浸烫缩头：浇水的水温过高；浇水时气温过高；夏日高温时淋到阵雨等。 10.新芽烂心：浇水灌入芽心后水份蒸散和吸收不了，盆内殖材不清洁产生叶腐病等。 11.叶片上有斑周缘有水浸状：湿度过度、盆湿和空气湿度相夹产生窒息、并伴有叶腐病菌。通风和通气不良。 12.叶片上有黄褐斑：根部受热所致。 13.叶片上有不规则黄斑、叶肉组织坏死而凹陷：病毒病又称“巴拉斯”所致。 14.叶片上有黄色小斑点：甲壳虫所致。 15.叶片上出现紫黑色，叶背面仍绿色：低温霜冻所致。缺磷肥也会发生。 16.叶片脱水，假球茎绉缩：盆内长期过干燥脱水所致。
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Miss Chen
2017年12月25日
Miss Chen

丁香花是木犀科丁香属落叶灌木，属于著名的庭园花木，花序硕大、开花繁茂，花色淡雅、芳香，习性强健，栽培简易，因而在园林中广泛栽培应用。丁香原产于我国东北北部至西南地区，现在仍有许多野生种，如小叶丁香、毛叶丁香、裂叶丁香、红丁香、辽东丁香等，均可移植栽培。丁香是雅俗共赏的观赏植物，开时芳菲满目，清香远溢。露植在庭院、园圃，用盆栽摆设在书室、厅堂，或者作为切花插瓶，都会令人感到风采秀丽，清艳宜人。
丁香叶子发黄的原因 正常现象 作为木本植物在休眠期会通过落叶，减少自身热量的散失，储备能量安全过冬。所以在秋末叶子发黄后慢慢脱落是正常现象，是植株正常的代谢。 黄化病 这个问题就严重了，黄化病主要是因为土壤中缺少可溶性的铁。 在许多地区土壤中含有很多碳酸盐，土壤会呈现碱性，尤其是北方地区，导致土壤的含铁量降低；或者说雨水过多，土壤中的铁元素流失。在此种情况下，土壤粘性较重，根部的生长活动会受到抑制，从而降低了对铁的吸收，人缺铁会贫血，植物缺铁，会影响光合作用，导致体内养分积累减少。 丁香叶子发黄怎么办 改良土壤 家庭盆栽丁香若土壤呈碱性，可以适当的进行改良。尽量不要种在碱性土壤中，或者地势低洼、易于积水的地方，否则根系很容易发育不良，导致黄化。 施肥抗病 及时补充肥料，在有机肥中适当的加点硫酸亚铁，既补充养分，有可以增加土壤的酸性。并且有机肥在发挥肥效的过程中产生有机酸，可以增加铁的活跃度，促进植株吸收。 浇食用醋 当丁香叶片有轻微发黄的现象，注意及时改良土壤，若没有专业的溶液，可以采用食醋或柠檬水，加水稀释，浓度要低，然后浇灌，之后每次浇水都可以加一点。
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Miss Chen
2017年12月25日
Miss Chen
Description: This annual or biennial plant is erect and 1-3' tall. It is unbranched along the lower half, while forming lateral stems above that are ascending. The central stem is light green to purplish green and longitudinally grooved along its sides. This stem often has spreading white hairs toward its base, while above these hairs become shorter and more appressed. The lateral stems are similar to the central stem above, except they are less grooved. Alternate leaves are up to 4" long and 16 mm. (2/3") across, becoming smaller in size and more sparse as they ascend the stems. The lowest leaves are oblanceolate in shape with long petioles, while the middle to upper leaves are elliptic to linear-elliptic in shape and they are either sessile or their petioles are short (less than ¼" in length). Some of the larger leaves have sparse coarse teeth along their outer margins. The upper leaf surface is medium green and hairless (or nearly so), while the lower leaf surface is light-medium green and short-pubescent along the central vein. The petioles, when they are present, are light green and more or less pubescent; the petioles of lower leaves are sometimes narrowly winged. The central stem and lateral stems terminate in cymes of flowerheads that collectively span up to 10" across for large plants. Individual cymes are dichotomously branched and somewhat flat-headed; as they mature, these cymes become more open and loose. Individual flowerheads span about ½" across and they have a daisy-like appearance. Each flowerhead has 40-100 ray florets that surround numerous disk florets. The petaloid rays of the former florets are usually white and linear in shape; sometimes these rays are pink- or purple-tinted. The corollas of the disk florets are yellow, narrowly tubular in shape, 5-lobed, and minute in size; they are densely bunched together. Surrounding the base of each flowerhead, there are linear phyllaries (floral bracts) in 1-2 series. These phyllaries are light green, short-pubescent, and about 3 mm. in length. The branches of cymes and the peduncles of flowerheads are similar in appearance to the lateral stems. The branches of cymes have solitary leafy bracts where they dichotomously divide. These leafy bracts are up to 1" long and linear-elliptic in shape. The peduncles of the flowerheads are up to 4" long. The blooming period occurs primarily from late spring to mid-summer, lasting about 1-2 months for a colony of plants. However, some plants may bloom later in the year. In warm sunny weather, the flowerheads may have a mild pleasant fragrance. Afterwards, the florets are replaced by small achenes that have small tufts of bristly hairs at their apices; they are distributed to some extent by the wind. The bodies of the achenes are about 1 mm. long, light brown, oblong-oblanceoloid in shape, slightly flattened, and short-hairy. The root system consists of a shallow branching taproot with secondary fibrous roots. This plant spreads by reseeding itself, occasionally forming loose colonies.
Cultivation: The preference is full sun, mesic to dry conditions, and a somewhat alkaline soil containing clay or gravel. However, this plant can adapt to soil containing fertile loam if taller and more aggressive plants are kept away from it. After the blooming period, the foliage of this plant slowly withers away while releasing its seeds. Range & Habitat: The native Daisy Fleabane is fairly common and it has been reported from almost all counties of Illinois (see Distribution Map). Habitats include black soil prairies, gravel prairies, hill prairies, limestone glades, dry savannas, eroding clay banks, pastures and abandoned fields, areas along railroads, and roadsides. While Daisy Fleabane is a pioneer species that prefers areas with a history of disturbance, it is more likely to be found in higher quality natural areas than the closely related Annual Fleabane (Erigeron annuus).
Faunal Associations: Primarily small bees and flies visit the flowerheads for nectar or pollen, including little carpenter bees (Ceratina spp.), cuckoo bees (Nomada spp., Stelis spp.), mason bees (Heriades spp.), plasterer bees (Colletes spp.), masked bees (Hylaeus spp.), Halictid bees (Halictus spp., Lasioglossum spp.), Halictid cuckoo bees (Sphecodes spp.), Syrphid flies, bee flies (Bombyliidae), Tachinid flies, flesh flies (Sarcophagidae), and Muscid flies (Robertson, 1929). Less common floral visitors include wasps, small butterflies, and beetles. Other insects feed destructively on the foliage, flowerheads, roots, and plant juices of Daisy Fleabane and other fleabanes (Erigeron spp.). These species include a plant bug (Polymerus basalis), a leafhopper (Empoasca alboneura), the Erigeron Root Aphid (Aphis middletonii) and Leafcurl Plum Aphid (Brachycaudus helichrysi), larvae of the Lynx Flower Moth (Schinia lynx) and other moths, the Meadow Purple-striped Grasshopper (Hesperotettix viridis) and other grasshoppers, and the Four-spotted Tree Cricket (Oecanthus quadripunctatus). For a more complete listing of these insects, see the Insect Table. Mammalian herbivores occasionally browse on the foliage and flowerheads of these plants. This includes deer, rabbits, groundhogs, sheep, and other livestock.
Photographic Location: The photographs were taken of plants at an eroding clay bank along a road near Urbana, Illinois. Comments: Daisy Fleabane (Erigeron strigosus) resembles Annual Fleabane (Erigeron annuus), but robust specimens of these two species are fairly easy to distinguish. Daisy Fleabane has fewer and more slender leaves than Annual Fleabane, and the hairs along its middle to upper stems are short and appressed, rather than long and spreading. Another species, Marsh Fleabane (Erigeron philadelphicus), differs by having slightly larger flowerheads with more ray florets (100-300), and wider leaves that clasp the stems. In addition, Marsh Fleabane has only spreading hairs along its stems. While the fleabanes (Erigeron spp.) are often dismissed as 'weeds' because of their ubiquitousness during the summer, they are actually rather attractive plants that are beneficial to many small insects that have important roles in the functioning of the ecological system. As pioneer species, fleabanes are also useful in providing early cover for exposed ground, thereby reducing soil erosion.
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Miss Chen
2017年12月25日
Miss Chen
Description: This herbaceous plant is a biennial or short-lived perennial. It is ¾–2½' tall and usually unbranched, except toward the inflorescence. Initially, there is a low rosette of basal leaves that disappears when the plant bolts during the spring. The central stem and upper stems are light green, multiangular-terete, and sparsely to moderately covered with spreading white hairs. Alternate leaves occur along the entire length of these stems, becoming smaller in size and more sparse as they ascend. These leaves are up to 3¾" long and 1¼" across; they are ovate, lanceolate, oblanceolate, or narrowly elliptic in shape. The leaf margins are often short-ciliate; upper leaves usually have entire (toothless) margins, while lower leaves are usually sparingly toothed, especially toward their tips. All of these leaves clasp the stems at their bases to a greater or less extent. Both the upper and lower leaf surfaces are light to medium green and sparsely short-pubescent to nearly glabrous. The central stem terminates in a panicle of flowerheads that is somewhat flat-headed. In addition, smaller panicles or clusters of flowerheads may develop from the axils of upper leaves. The branches and peduncles of these flowerheads are similar to the stems, except their hairs are shorter. There are often solitary leafy bracts up to 1" long where the branches of an inflorescence divide; these bracts are narrowly lanceolate. Each daisy-like flowerhead is ½–¾" across, consisting of 100-300 ray florets that surround a dense head of disk florets. The petaloid rays of the flowerhead are white (less often light pink or light violet), linear in shape, and densely distributed. The corollas of the disk florets are 2-3 mm. long, yellow, and narrowly tubular in shape. Surrounding the cup-like base of each flowerhead, there are numerous appressed phyllaries in a single overlapping series. Individual phyllaries are light green, linear in shape, and sparsely short-pubescent. The blooming period occurs from late spring to mid-summer, lasting about 1–1½ months. There is either a mild floral fragrance or none. Afterwards, this plant tends to die down for the remainder of the summer. The florets are replaced by achenes with small tufts of white bristly hair; they are distributed by the wind. The narrow achenes are 0.5–1 mm. long. The root system is shallow and fibrous, sometimes forming a small caudex on older plants. Colonies of plants occasionally occur at favorable sites.
Cultivation: The preference is full to partial sun, moist conditions, and soil containing fertile loam, although soil containing some clay or gravel is readily tolerated. This plant will adapt to drier locations, but its size will be reduced. Like similar fleabanes (Erigeron spp.) that are somewhat weedy, it may spread to undesirable locations by reseeding itself. Range & Habitat: Philadelphia Fleabane is a common plant that occurs in almost every county of Illinois (see Distribution Map), where it is native. Habitats include moist depressions in black soil prairies, moist meadows along rivers, low areas along ponds and small lakes, edges of marshes, roadside ditches, moist depressions along railroads, fallow fields, vacant lots, and waste areas. Moist disturbed areas are preferred.
Faunal Associations: The nectar and pollen of the flowerheads attract a variety of insects, including little carpenter bees (Ceratina spp.), cuckoo bees (Nomada spp.), mason bees (Osmia spp.), leaf-cutting cuckoo bees (Stelis spp.), Halictid bees, Halictid cuckoo bees (Sphecodes spp.), masked bees (Hylaeus spp.), Andrenid bees, Eumenine wasps (Ancistrocerus spp., Stenodynerus spp.), Syrphid flies, thick-headed flies (Conopidae), Tachinid flies, flesh flies (Sarcophagidae), butterflies, skippers (Polites spp.), beetles, and plant bugs (Miridae). Other insects feed destructively on the plant juices, roots, flowerheads, and other parts of Philadelphia Fleabane and other fleabanes (Erigeron spp.). These species include the aphids Uroleucon erigeronense and Uroleucon gravicorne, the leafhopper Empoasca alboneura, the plant bug Polymerus basalis, and the caterpillars of such moths as the Wavy-lined Emerald (Synchlora aerata), Speyer's Cucullia (Cucullia speyeri), and the Lynx Flower Moth (Schinia lynx). The Insect Table has a more complete listing of insects that feed on fleabanes. Deer, rabbits, groundhogs, horses, cattle, and sheep also eat the foliage and flowerheads of these plants.
Photographic Location: The photographs were taken along a roadside ditch in Champaign, Illinois, and on a lawn near Urbana, Illinois. Comments: Philadelphia Fleabane can be distinguished from other fleabanes (Erigeron spp.) by its clasping leaves and the greater number of ray florets on its flowerheads. Compared to Annual Fleabane (Erigeron annuus) and Daisy Fleabane (Erigeron strigosus), this plant prefers moister locations. In areas with mild winters, Philadelphia Fleabane may live longer than 2 years, although it is still short-lived. There is some variation in the characteristics of this plant across its range. These varieties are differentiated by the persistence of their basal leaves and the hairiness of their foliage. In Illinois, only the typical variety occurs. Another common of Erigeron philadelphicus is Marsh Fleabane.
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Miss Chen
2017年12月25日
Miss Chen
Description: This is a perennial plant up to 3½' tall that branches occasionally. The light green stems have small purple streaks and scattered white hairs. The alternate or opposite leaves are up to 6" long and 3" across, becoming smaller as they ascend the stems. The leaves are ovate to lanceolate in shape and their margins have widely spaced teeth (or less often, they lack teeth). The upper leaf surface is olive or dark green with minute appressed hairs. The petioles are short and slightly winged. Upper stems terminate in individual flowerheads spanning about 2½-4" across. These flowerheads have long naked peduncles (flowering stalks) up to 8" long; the peduncles have scattered hairs like the stems. Each daisy-like flowerhead has 10-20 ray florets that surround a large central cone of numerous disk florets. The central cone is yellowish brown to reddish brown, somewhat flattened, and very prickly. The petaloid rays are purple, narrowly oblong, and they tend to droop downward with age. Around the base of each flowerhead, there are numerous floral bracts (phyllaries) that are arranged in several layers. These bracts are green, hairy, and narrowly lanceolate, becoming recurved when the flowerhead blooms. The blooming period begins in mid-summer and lasts about a month, after which there is a temporary dormancy. Later, some plants may bloom again during the early fall. In bright sunlight, the flowerheads are mildly fragrant. Afterwards, the disk florets are replaced by dark achenes that are narrow and flat; they lack tufts of hair. At this time, the seedhead is prickly and dark-colored. The root system is fibrous and short-rhizomatous. Small dense colonies of plants may form from the rhizomes.
Cultivation: The preference is full to partial sun and moist to mesic conditions. Growth is best in fertile loam, but the soil can contain some gravel or clay. Foliar disease is rarely troublesome. While there is some drought resistance, the entire plant will wilt if the soil becomes too dry, particularly in strong sunlight. This plant is very easy to grow if the preceding requirements are met. Range & Habitat: The native Purple Coneflower occurs primarily in central and NE Illinois, and a few counties in southern Illinois (see Distribution Map). While often grown in gardens around homes and businesses, it is an uncommon plant in the wild. However, Purple Coneflower is often used in prairie restorations, where it may be locally common. Some populations, particularly in the Chicago area, are probably plants that have escaped from cultivation. Habitats include moist to mesic black soil prairies, edges and openings in woodlands, savannas, thickets, and limestone glades.
Faunal Associations: The flowers are cross-pollinated by long-tongued bees, bee flies, Halictid bees, butterflies, and skippers. Among long-tongued bees, are such visitors as honeybees, bumblebees, digger bees (Melissodes spp.), and leaf-cutting bees (Megachile spp.). Butterfly visitors include Monarchs, Fritillaries, Painted Ladies, Swallowtails, Sulfurs, and Whites. The caterpillars of the butterfly Chlosyne nycteis (Silvery Checkerspot) feed on the foliage, while the caterpillars of several moths feed on the flowerheads. These latter species include Chlorochlamys chloroleucaria (Blackberry Looper), Eupithecia miserulata (Common Eupithecia), Synchlora aerata (Wavy-Lined Emerald), and Homoeosoma electella (Sunflower Moth). A small songbird, the Eastern Goldfinch, occasionally eats the seeds during the summer and early fall.
Photographic Location: The photographs were taken at Meadowbrook Park in Urbana, Illinois, and the webmaster's wildflower garden in the same city. Comments: This is a striking plant when it is in full bloom, as the flowers are large and colorful. There is a cultivated form, called 'White Swan,' that is often grown in flower gardens, but plants with white petaloid rays are very rare in the wild. Purple Coneflower seems to attract more than its fair share of butterflies, particularly in sunny, sheltered areas. It can be distinguished from the similar Echinacea pallida (Pale Purple Coneflower) by its broader leaves, bushier habit, and later blooming period.
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Miss Chen
2017年12月25日
Miss Chen
Description: This herbaceous perennial plant is 1-3' tall and unbranched. The central stem is light green, terete, and glabrous to sparsely covered with appressed-ascending hairs. Alternate leaves occur along each stem, their blades becoming significantly shorter as they ascend; the upper leaf blades are ascending, while the lower leaf blades are widely spreading to arching. The leaf blades are 2-12" long and ¼–¾" across; they are linear to narrowly elliptic in shape and entire (toothless) along their margins. In addition, their margins are usually minutely ciliate, otherwise they are glabrous. Both the upper and lower surfaces of the leaf blades are medium green and glabrous (or nearly so). The primary veins of leaf blades are parallel. The lower to middle leaves have narrow petioles that are up to 6" long, while the upper leaves are sessile or they clasp the central stem. The central stem terminates in a solitary flowerhead on a long naked peduncle that is more or less erect. The peduncle is typically 4-12" long and its characteristics are similar to those of the central stem. Each flowerhead is about 2–2½" across, consisting of 10-30 ray florets that surround a central head of numerous disk florets. The central head is dark reddish brown to nearly black, dome-shaped to nearly globoid, and prickly in both appearance and touch from the hardened scales of its receptacle. The disk florets are up to ¼" (6 mm.) in length, narrowly tubular in shape, and 5-lobed. The petaloid rays of the flowerhead are yellow, narrowly oblong in shape, and descending. The blooming period occurs from late spring to mid-summer, lasting about 1 month for a colony of plants. Afterwards, the disk and ray florets are replaced by achenes. These achenes are 4-5 mm. long, narrowly oblongoid-angular in shape, tan to brown, and glabrous; their apices may have a crown of up to 4 minute teeth each. The root system consists of a taproot. This plant reproduces by reseeding itself.
Cultivation: The preference is full sun, mesic to dry conditions, and rocky soil. However, in cultivation it will adapt to most soil types if they are well-drained. Range & Habitat: Currently there are no records of Ozark Coneflower naturalizing in Illinois, i.e., persisting in the wild for more than one year (see Distribution Map). However, the webmaster observed a single plant of this species (the typical variety) growing wild in an upland prairie at Meadowbrook Park in Urbana, Illinois, that persisted and flowered for a single year. Because Ozark Coneflower is occasionally cultivated in gardens, there exists the possibility that it could escape and naturalize within the state. The typical variety of this species, as described here, is endemic to Missouri and Arkansas, where it is found in such habitats as rocky prairies, hill prairies, glades, and bald knobs. This is regarded as a conservative species that is found in high quality natural areas where the original ground flora is still intact.
Faunal Associations: Information about floral-faunal relationships for this species is rather limited. The nectar and pollen of the flowerheads attract various insects, especially long-tongued bees, butterflies, and skippers. According to Covell (1984/2005), the caterpillars of some Geometer moths feed on the florets of coneflowers (Echinacea spp., Rudbeckia spp.) in the Aster family, including Chlorochlamys chloroleucaria (Blackberry Looper Moth), Eupithecia miserulata (Common Pug), and Synchlora aerata (Wavy-lined Emerald). Various grasshoppers feed on the foliage of Ozark Coneflower, although the presence of the Northern Fence Lizard (Sceloporus undulatus) near brush piles reduces the extent of the damage that these insects cause (Van Zandt et al., 2005). During late summer to early autumn, the Eastern Goldfinch eats the seeds of Ozark Coneflower and other Echinacea spp.
Photographic Location: A flower garden at the Arboretum of the University of Illinois in Urbana, Illinois. Comments: Ozark Coneflower (Echinacea paradoxa paradoxa) can be distinguished from other coneflowers in the Echinacea genus by its yellow petaloid rays – all of the others have pink, light purple, purple, or white petaloid rays. The other variety of this coneflower, Bush's Purple Coneflower (Echinacea paradoxa neglecta), differs from the typical variety by having pink, light purple, or white petaloid rays and its achenes are at least partially hairy, rather than glabrous. This latter variety is endemic to Oklahoma and Texas. Ozark Coneflower superficially resembles Missouri Coneflower (Rudbeckia missouriensis), but the leaves and stems of the latter species are more hairy, its petaloid rays are widely spreading rather than drooping, and the head of its compound flower is relatively smooth, rather than prickly.
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Miss Chen
2017年12月25日
Miss Chen
Description: This herbaceous perennial plant is up to 3' tall and unbranched. The stout central stem is greyish or reddish green and covered with coarse white hairs. Most of the leaves occur near the base of the plant, although a few of them alternate along the lower 1/3 of the stem. They are up to 9" long and 2" across, and narrowly lanceolate, oblanceolate, or ovate. The margins are smooth, but often curl upward, while the upper and lower surfaces of the leaves are covered with fine white hairs. Leaf venation is primarily parallel, although a few fine pinnate veins may be present. A single daisy-like composite flower develops at the top of the stem. It is about 3" across, consisting of a prominent reddish brown cone of disk florets, which are surrounded by 12-20 light purple ray florets. The ray florets are long, slender, and droop downward. There is no noticeable floral scent. The blooming period occurs during early summer and lasts about 3 weeks, after which the ray florets shrivel away and the central cone turns black. The achenes are without tufts of hair. The root system consists of a stout taproot. Cultivation: The preference is full sun and average to dry conditions. The soil can contain loam, clay, or rocky material. There is a tendency for Pale Purple Coneflower to flop over when in bloom if it is pampered by too much water or lacks adequate support from adajacent vegetation. It doesn't seem to be bothered much by disease, and withstands drought very well. Development is slow unless ample sunlight is received. This plant can fail to survive the winter if the central taproot is not covered with sufficient soil. Range & Habitat: Pale Purple Coneflower occurs occasionally throughout Illinois, except in some of the southern counties (see Distribution Map). It is native to Illinois. Habitats include mesic to dry black soil prairies, openings in dry rocky woods, Oak savannas, limestone glades, abandoned fields, and open areas along railroads. It is possible that this plant occurred in gravel or dolomite prairies before these habitats were largely destroyed by development.
Faunal Associations: Long-tongued bees, butterflies, and skippers are the most important visitors to the flowers. Among the long-tongued bees, are such visitors as bumblebees, Nomadine cuckoo bees, large carpenter bees, and leaf-cutting bees. Short-tongued green metallic bees and other Halictine bees also visit the flowers occasionally. The caterpillars of the butterfly Chlosyne nycteis (Silvery Checkerspot) feed on the foliage, while caterpillars of the moths Synchlora aerata (Wavy-Lined Emerald) and Eupithecia miserulata (Common Eupithecia) feed on the flowerheads. Goldfinches occasionally eat the seeds. Mammalian herbivores, particularly livestock, may eat this plant occasionally, but it is not a preferred food source. Photographic Location: The photographs were taken at the Red Bison Railroad Prairie in Savoy, Illinois. Comments: This plant usually precedes Echinacea purpurea (Purple Coneflower) in bloom by about 2-4 weeks. Sometimes their flowers are difficult to tell apart, but the leaves of Pale Purple Coneflower are more long and narrow, hairier, lighter green, and tend to remain near the base of the plant.
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Miss Chen
2017年12月24日
Miss Chen

瓜叶菊，多年生草本，常作1-2年生栽培。分为高生种和矮生种，20-90厘米不等。全株被微毛，叶片大形如瓜叶，绿色光亮。花顶生，头状花序多数聚合成伞房花序，花序密集覆盖于枝顶，常呈一锅底形，花色丰富，除黄色以外其他颜色均有，还有红白相间的复色，花期1-4月。
瓜叶菊叶子发黄——缺硼 缺硼会引起瓜叶菊叶子发黄，如果瓜叶菊缺硼，会使得植株的顶端的节间缩短，变得脆弱易断，并且新叶生长缓慢，叶子变黄。这多半是因为土壤比较干旱，影响了根系多硼元素的吸收。一般发生这种现象，应该及时的浇水，此后要保持盆土见干见湿。还可以喷施一些硼砂水溶液，每个周可以喷一次，连续喷上2、3次，就可以改善了。 瓜叶菊叶子发黄——缺钙 缺钙有时候也会导致瓜叶菊叶子发黄，一般会表现为叶子的边缘变黄，叶片向外反卷，在中午的时候叶片会向内卷在傍晚的时候会恢复。一般瓜叶菊缺钙是因为有机肥的含量较少，此时可以追施一些有机肥，在水肥后要立即淋上水，并要喷洒氯化钙溶液，10天喷洒一次，喷2次即可。 瓜叶菊叶子发黄——缺钾 瓜叶菊在缺钾的时候会导致叶子的边缘，由褐色变成枯黄色，并且不断的向内扩大。一般追施适量的硫酸钾在根部，并且在瓜叶菊的叶子上喷施一些磷酸二氢钾溶液，可以使其恢复，正常生长。 瓜叶菊叶子发黄——缺镁 缺乏镁元素，也会对瓜叶菊生长产生不利的影响，使其叶肉黄花，并不断加重危害。可以喷洒一些硫酸镁溶液2——3次，能够恢复生长。 瓜叶菊叶子发黄——冬季干燥 冬季的时候养殖瓜叶菊，最好可以保持一个合适的湿度，不能过于干燥，过于干燥会导致瓜叶菊萎蔫，容易枯黄，也容易发生病害。所以冬季的时候一定要合理的浇水。
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Miss Chen
2017年12月24日
Miss Chen

文竹是著名的观赏植物之一，别称云片松、刺天冬、云竹等，为多年生常绿藤本观茎植物，具有极高的观赏价值，可以种植在室内，可放置客厅、书房，净化空气的同时也增添了书香气息。
文竹叶子发黄之浇水 原因 大家都知道文竹喜欢湿润的环境，但是这并不意味着就要一直给文竹浇水，保持盆土见干见湿，不干不浇，浇则浇透，才是浇灌文竹的正确方法。 解决办法 如果发生浇水过多，可暂时不浇水，而改为只向叶面喷水来为文竹保湿。 文竹叶子发黄之强光 原因 文竹是半阴性的植物，可想而知，如果放到强光下肯定会将文竹烧伤，枝叶枯黄。 解决方法 将花盆移到阴凉处，并多给枝叶喷水，增加湿度，水分蒸发会带走一定量的热度，可以给文竹降温。 文竹叶子发黄之温度 原因 如果是长时间的处在较低的环境之中，会导致文竹冻伤，文竹受到冻害而导致代谢缓慢，就会引起叶子发黄。 解决办法 解决方法就是让文竹处在15度左右的环境中，并且可以适当散光弱光照射。 文竹叶子发黄之肥料 原因 肥料施用太多或者是太少都会导致文竹有些不适，如果肥料太多的话就会造成烧苗，如果肥料施用的太少，会导致文竹后续营养不足，也会引起叶子发黄。 解决办法 如果施肥过多，建议马上换盆，将文竹移栽到新的环境中。或者立即浇水，然后将植株移到光线明亮，通风良好的地方。 如果是肥料不够，建议适量增化肥，提供文竹所需的养分。 文竹叶子发黄之病虫害 原因 介壳虫是文竹养殖最常见的虫害，生了介壳虫之后，如果放任不理，文竹本身的营养就会介壳虫吸收殆尽，也会导致叶片发黄。 解决办法 当发现有介壳虫时，应及时用湿布条擦去。 严重时要到药店买进行防治，并及时换盆土。 在换盆土时可将老残根须剪掉，减少养分消耗。 文竹叶子发黄之气体中毒 原因 文竹是很怕烟尘的，如果经常受到烟尘等有害气体袭击，文竹就会出现枝叶发黄的中毒现象。另外，比如电视辐射，火等，也是会引起文竹的叶子发黄。 解决办法 发生这种情况，要及时将花盆搬离原来位置，加大叶面洒水除尘的工作。将文竹叶面的灰尘擦去，或者是远离电视机等辐射物品。 文竹叶子发黄之冬管不善 原因 文竹有适合自己生长的温度，一般而言是12-18℃之间最合适，特别北方冬季的时候要摆放在向阳位置。如果文竹哎冬季的时候长期摆放在通风不畅，温度又太低的地方，可是会导致叶子发黄的。 解决办法 冬季文竹养殖的温度一般不得低于12℃，并要放在光线较好的地方，可适当减少浇水。 若温度达不到要求，可用塑料膜制作一个简单的保温棚，帮助文竹过冬。
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