Purple orchid tree (Bauhinia variegata) has an unusually long bloom season for a tree, with blossoms that make their appearance in late winter before the tree leafs out and last until early summer. The fragrant flowers bloom in bright pink, purple and white, and resemble showy orchids. It is an ideal size for small residential landscapes, growing 20 to 35 feet tall with a similar spread. Orchid trees are hardy in U.S. Department of Agriculture plant hardiness zones 9 though 11.
Water the tree occasionally, applying the water slowly so that it penetrates deep into the soil. During the hottest months of summer, increase watering to every 10 days. Dry winters may cause the tree to drop its leaves, but they return in late winter or early spring.
No special fertilizer requirements are documented for orchid trees, but the tree blooms best with regular fertilization.
The tree prefers moist soil but tolerates dry spells. Orchid trees are not an appropriate choice for coastal gardens because they don't tolerate salty wind or soil, and the brittle branches are likely to break in strong coastal winds
It drops its leaves but recovers when temperatures drop as low as 22 degrees Fahrenheit. If regularly subjected to freezing temperatures, the tree remains shrub-like.
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