It is more appropriate to pinch the top when the sunflower grows to 5 cm, which can promote the growth of more new buds. When pinching the head, it should be done at one time, and the incision should not be damaged many times. Appropriate thinning treatment should be carried out to loosen dense branches and cut off some withered branches and leaves to avoid nutrient consumption. After pruning, it should be placed in a cool place 1 ~ 2 weeks to accelerate wound healing.

Sunflowers are 5 cm long and are suitable for coring.

In general, when the sunflower grows to about 5 cm, it is suitable to pinch the top, which can promote the lateral branches to grow more leaf buds, thus reducing the consumption of nutrients. At the same time, when pinching the head, it should be done at one time to avoid hurting the incision many times, and then pay attention to ventilation to facilitate growth.

Sunflowers grow fast, so it is necessary to properly thin branches in their infancy, mainly by thinning branches to increase ventilation, and then cutting off all the branches that grow too long together with the lateral branches, which is conducive to pot explosion.

When the branches of sunflower grow densely, the branches on the crown can be pruned at this time, and all the yellow and withered branches and leaves can be cut off, so as to achieve the effect of shaping, promote nutrient concentration, and properly prune after flowering to promote secondary flowering.

When the sunflower is pruned, it can be placed in a cool and ventilated place 1 ~ 2 weeks to make the incision heal quickly. At the same time, water and fertilizer should be supplemented appropriately, instead of direct light, mainly scattered light to promote photosynthesis of branches and leaves.