Winter pruning is mainly plastic surgery. When the temperature drops below 5℃, the dead branches, diseased branches, overlapping twigs and tender branches that have not grown strong after autumn are cut off from the main branches, and then pruned in three ways: strong, medium and weak.
(1) Strong cutting: Weak strong cutting is suitable for plants that are not strong enough, and about 2/3 of the whole plant is cut off, leaving 2 ~ 4 sovereignty to concentrate nutrition. Strong pruning is the main way of potted large-flowered rose.
(2) For the ongoing pruning with normal growth and uniform tree shape, the intermediate pruning is about 1/2. Prune the diligent flower varieties suitable for easy-to-grow branches.
(3) Weak pruning: the plants with vigorous growth and normal development are weakly pruned, and the pruning amount is about 65,438+0/3 to prevent excessive consumption of nutrients. Flower roses and miniature roses can leave more branches as appropriate, which is more conducive to showing the characteristics of lush flowers.
After pruning, remove the residual leaves, clean the basin surface and pay attention to saving water. When the temperature drops to minus 5℃, it will be stored in a cold cellar or freezer.
Knives and scissors for pruning should be sharp, so as to make the cutting mouth smooth and prevent the branches from splitting. Generally, it is cut from the place 5 mm above the bud point, and generally leaves the outer bud point to make the branches stretch evenly, keep the plants ventilated and transparent, and prevent pests and diseases from lurking. For branches with sparse branches, internal bud points can also be left as appropriate to make the plant shape properly folded and plump.
If the roses planted on the ground overwinter in the open air and are cold-proof in late autumn, they should not be cut hard to prevent people from being hurt by air drying. After thawing next spring, trim it properly.