1. In the middle and late stages of sunflower growth, combining snoring and artificially assisted pollination, choose plants that are not divided into weights, have no harm to pests, have the same appearance as the present plant, have the same plant height and maturity, and have medium-sized discs. Harvested alone.
2. Studies have shown that the kernels in the middle part of the flower disk are medium in size, full and full of nutrients, and these fruits are used as seeds. The grown seedlings are strong and the plant roots are well developed. Therefore, it is best to leave the fruit in the middle part of the disk as a seed.
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