But too much heat and humidity can seriously compromise the health and well-being of landscape plants. This is especially true for bedding plants, which generally spend only one season in the garden and have little time to become established and prepared for the rigors of summer.
Bedding plants vary in their tolerance of heat and humidity.
This is related to their native background. Some come from arid, desert-like places and are better adapted to bright, hot and dry conditions. Others come from the tropics and subtropics and prefer a hot, humid environment. The weather may change drastically from one year to the next, as well as throughout the color season. It may get very hot, followed by a period with no rain.