วันอาทิตย์ที่ 28 ธันวาคม พ.ศ. 2551

Tulips




Tulipa, commonly called tulip, is a genus of about 150 species of bulbous flowering plants in the family Liliaceae. The native range of the species includes southern Europe, north Africa, and Asia from Anatolia and Iran in the west to northeast of China. The centre of diversity of the genus is in the Pamir and Hindu Kush mountains and the steppes of Kazakhstan. A number of species and many hybrid cultivars are grown in gardens, used as pot plants or as fresh cut flowers. Most of the cultivated species, subspecies and cultivars of tulip are derived from Tulipa gesneriana.
Cultivation

Tulip Festival in Woodburn, Oregon. 2007

Wild tulip in the steppes of Kazakhstan
Tulips originate from mountainous areas with temperate climates and need a period of cool dormancy. They do best in climates with long cool springs and early summers, but they are often grown as spring blooming annual plantings in warmer areas of the world. The bulbs are typically planted in late summer and fall, normally from 10 to 20 cm (4 to 8 in.) deep, depending of the type planted, in well draining soils. In parts of the world that do not have long cool springs and early summers, the bulbs are often planted up to 12 inches deep; this provides some protection from the heat of summer and tends to force the plants to regenerate one large bulb each year instead of many smaller non blooming ones. This can extend the usefulness of the plants in warmer areas a few years but not stave off the degradation in bulb size and eventual death of the plants.


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