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Common directions for putting plants into pots says the pots must have drain holes so that the roots of the plants don't "drown". How is this problem avoided in the "self watering" type of pot where there is a reservoir of water at the bottom of the pot and and a cylinder filled with soil that wicks moisture up from the reservoir? Do the roots of the plant never grow into the cylinder? - Or are the plants re-planted elsewhere before this can happen?