Vegetation time (also the vegetative phase or vegetation period) is the rhythmically repeating part of the year in which a plant actively grows and unfolds. The doctrine of the related biological processes is called phenology designated. in the viniculture Vegetation time is the period of the last one frost (Late frost) in spring until the first frost (early frost) in autumn. This should be at least 180 days. The remainder of the year, when a perennial plant does not grow, is referred to as the dormancy, period of rest or rest period. The total number of annually recurring growth phases of a plant including resting phase is the vegetation cycle. In viticulture, however, is often the vegetation cycle of the vine understood as a period without a rest period.