As a rule, a rise in temperature of the air surrounding the plant will increase the rate of transpiration and thus help prevent engorged cells and blisters from forming. Increasing the ventilation also hastens transpiration by lowering the humidity at the leaf surface. One should, however, avoid cold drafts. Plants that are overwatered are highly susceptible to edema. At the same time, plants that are properly watered but located in low light or cool areas are equally susceptible to this problem.
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