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Tulips are indigenous to mountainous areas with temperate climates and need a period of cool dormancy, known as vernalization. They thrive in climates with long, cool springs and dry summers. Although perennials, tulip bulbs are often imported to warm-winter areas of the world from cold-winter areas, and are planted in the fall to be treated as annuals.
Tulip bulbs are typically planted around late summer and fall, in well-drained soils, normally from 4 inches (10 cm) to 8 inches (20 cm) deep, depending on the type planted. In parts of the world that do not have long cool springs and dry summers, the bulbs are often planted up to 12 inches (30 cm) deep. This provides some insulation from the heat of summer, and tends to encourage the plants to regenerate one large, floriferous bulb each year, instead of many smaller, non-blooming ones. This can extend the life of a tulip plant in warmer-winter areas by a few years, but it does not stave off degradation in bulb size and the eventual death of the plant due to the lack of vernalization.
October 1st, 2013
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