in the American Horticultural Society's "Heat Zones". See and Breeding for heat stress tolerance. For drought tolerance, see and Breeding for drought stress tolerance. For flood tolerance, see cited review. The mechanisms of wind tolerance are still poorly understood. Wind not only causes mechanical stress, but also makes the plant colder and dryer. Plants may evolutionally adapt to wind by becoming smaller (to avoid wind) or bigger (to resist the wind). Physiologically, the mechanical force also causes a cascade of signals in the living plant. See also Microclimate References Bibliography External links Interactive Version of the 1990 USDA Hardiness Zone Map Plants by adaptation Agricultural terminology Crops Garden plants Horticulture Plant ecology Trees by climate Climate zones