After the seedlings are planted and germinated, only one healthy new shoot is left for each plant to extend and grow forward. When the new shoot grows to 30-40 cm, the new shoot is tied with scaffolding. In August, when the new branches grow to 2-2.5m, core is taken, and the top 2-3 secondary branches are reserved, and 2-3 leaves are reserved for repeated core taking, and the remaining secondary branches are reserved for 1 leaf for repeated core taking. After defoliation in autumn, cut each main vine1.5 ~ 2m.

(2) Pruning from germination to fruit harvesting

(1) Bud wiping

When the buds germinate to the size of peanuts, the fine secondary buds on the bud eyes can be erased, and the hypertrophy of the central main bud can be preserved.

(2) thinning and fixing branches

When the new shoots grow to 3 ~ 5 leaves, keep the branches with strong inflorescences, and erase the branches with thin growth, no inflorescences or small inflorescences in time. Generally, two-year-old grapes can keep 5 ~ 7 new fruiting branches on each main vine, and the redundant new branches can be erased at any time. It is advisable to leave 10 ~ 15 new fruiting branches per square meter for perennial grapes.

③ Binding

When the fruiting branches are about 30 cm long, flatten the strong growing branches to places with fewer branches and leaves, and generally do not tie the weak branches, so that the fruiting branches are evenly placed on the shelf surface.

④ The inflorescence is sparse, and the ear is pinched.

About 10 days before flowering, the thinning amount should be determined according to the number and size of inflorescences in the current year. Generally, weak branches leave no inflorescence, while medium branches leave one inflorescence. In years with few inflorescences, two inflorescences can be left with strong branches to ensure yield. You can grasp the spike tip according to the size of the inflorescence and pinch off all the attached spikes on the inflorescence.

⑤ coring

When a few grapes bloom in the greenhouse that day, 5-6 leaves are left above the inflorescence for fruiting branches and 4-5 leaves for nourishing branches. Only the topmost 1 ~ 2 secondary branches are left after the new shoots are cored, 2 ~ 3 leaves are left for repeated coring, and all the other secondary branches are smoothed.

(3) Pruning grapes planted for many years.

In addition to the above methods, there are also the following requirements for shaping and pruning grapes that have been planted for many years:

① Winter scissors

Grapes in small shed are mainly dragon-shaped, and the distance between grape shelf surface and greenhouse film should be kept at about 50 cm. The spacing of fruiting branches on the main vine is not less than 30 cm, and about 12 fruiting mother branches are left per square meter of frame surface.

② Prune the grapes after harvest.

Immediately after the grapes are harvested, remove the plastic shed film, clean the shelf surface and remove the dense branches. When pruning in winter, the main branch is short branch pruning, leaving 2 ~ 3 buds.