Generally with higher temperature the rate of reaction increases. Plant growth functions and rates, such as absorption of minerals and water, are determined by temperature.
All plants have an optional temperature at which they function the best.
Plants also have a minimum temperature tolerance below which the plant may be injured, and in some cases killed. Sunscald of plant's leaves is much more likely to occur at high temperatures. High temperatures cause desiccation or may directly kill protoplasm of cells. Protoplasm is another term for cytoplasm, which is a general term for the fluid and solids in cells. Plants should be selected according to the growth conditions and climate of the area.