The vegetation period (also vegetation phase or period) is the rhythmically repeating part of the year in which a plant actively grows and develops. The study of the associated biological processes is known as phenology. In viticulture, the vegetation period is the period from the last frost (late frost) in spring to the first frost (early frost) in autumn. This should be at least 180 days. The remaining part of the year in which a perennial plant does not grow is called the dormancy period. The entirety of the annual growth phases including the dormant period is the vegetation cycle. Sometimes, however, the vegetation cycle of the vine is understood as a period without a dormant period.
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Markus J. Eser
Weinakademiker und Herausgeber „Der Weinkalender“