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Orchid roots have a very interesting and different structure than most garden plants. Epiphytic orchids are adapted to growing in trees and have developed roots that can absorb moisture from the air. Their roots are covered with a silvery gray thick, spongy material called velamen, which absorb moisture from the air and insulate the roots from excessive temperatures.
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The tips of the roots are green because they contain chlorophyll. They are delicate so be careful not to damage them when handling the plant or transplanting it.
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Orchids growing in the ground, called terrestrials, have different roots. Many have roots that are covered with tiny hairs that help the plant absorb water.