How to prune northern grapes, winter pruning time

1. How to prune

1. Pruning length: When pruning, the length of the cut should be determined according to the growth of each branch, the location of the flower buds and the rate of fruiting branches. If the conditions are the same, branches with good nutritional status should be left longer. If the flower buds on weak branches are well distributed, they should be pruned appropriately. Under normal circumstances, the extension branches should be left long and the preparatory branches should be shortened. In addition, if the area is relatively dry or there is insufficient fertilizer and water, the main thing to do is to prune short shoots.

2. Pruning position: Each time the cut is made, the tissue will be loose and the water will be easily evaporated, so the cut should be far away from the bud, keeping a distance of about 2-4 cm to avoid excessive evaporation of water. In addition, the cut should be made on the opposite side of the bud.

3. The amount of buds left: The amount of buds left during pruning must be controlled, neither too dense nor too sparse. Generally speaking, the amount of buds left is twice that of the second spring. For example, leave 15-20 buds on the new shoots on the trellis surface, and leave 30-40 buds when pruning in winter, so as to ensure flowering and fruiting in the later period.

2. Winter pruning time

When pruning grapes in winter, you must control the time. It should not be pruned too early or too late, otherwise it will be detrimental to the growth next year and will affect its nutrient storage. It is best to prune during the first 30 days from the dormant period to the sap flow period, specifically between late October and mid-to-late November. If it is grown in a greenhouse, it should be done before covering the film.