Answer: Winter shears for grapes grown in greenhouses should be carried out after the grape plants have fallen completely into dormancy after the leaves have fallen, and they are generally completed from mid-December to the end of December. According to the different cultivation styles, the characteristics of the variety and the strength of the tree determine the specific method of pruning. Greenhouse vineyard racks generally use hedges, V-frames and small sheds. When trimming the hedge, choose to keep the orientation of the female branch vines. Keep the branches of the grapevines with the pull-ups facing upwards. For V-shaped racks, choose the orientation of the female branches to be sideways. For small scaffolds, due to the relatively dense planting distance, you should take a small dragon. The shaping method of the rod directly selects the fruiting branch on the main vine. Pruning according to the characteristics of the variety, for purple crisp, early red mention, summer solstice red and other varieties of pruning should use medium-long tip shears, the middle result of the mother branch leaves 4 to 6 shoots short. As a result, the mother branch leaves 6-8 buds and cuts. The number of buds per mu is 7000 ~ 8000, so that it can be adjusted when the spike can be identified after tapping.
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