Growing-degree Day
Growing degree days (GDD), also called growing degree units (GDUs), are a heuristic tool in phenology. GDD are a measure of heat accumulation used by horticulturists, gardeners, and farmers to predict plant and pest development rates such as the date that a flower will bloom or a crop reach maturity.
Read more about Growing-degree Day: Introduction, GDD Calculation, Plant Development, Pest Control, Honeybees, Baselines
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—Ralph Waldo Emerson (1803–1882)