Period (also called dormancy, vegetative dormancy, winter dormancy) in the annual vegetative cycle of the grapevine (see also BBCH code). This is understood to be the absolute rest period of the plant between leaf fall in autumn and budbreak in spring. At this time, the flow of sap and energy from the roots to the shoots and vice versa is at rest. This is the ideal time for pruning, which initiates the next vegetation cycle and is an important criterion for the vine training is to be made. Winter dormancy covers the period from December to February in the northern hemisphere and from June to August in the southern hemisphere. Growth then begins with bud swelling and bud break.