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Budding

Beginning of the annual vegetative cycle of the vine after hibernation (see also BBCH code). At an average daily temperature of 8 to 10 °Celsius, the eyes (winter buds) that were deliberately left standing during winter pruning break open. This can be seen some time in advance, because with the coming spring and thawed soil, the roots begin to pump sap into the above-ground part of the vine, so that water droplets emerge at the intersections of cut shoots (the vine "bleeds"). As the heat increases, the buds swell visibly until the woody bud scales break open and a felt-like, spherical web of hairs becomes visible, which initially still protects the underlying shoot tip from external influences such as sun and rain.

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