The first flower opened by the zucchini is usually a female flower, and the second flower is usually a male flower. The male and female flowers usually open at 4-6 in the morning and the male flowers are scattered at 9-11 am, which is the best time for pollination. When pollinating, you should first check whether the male flower produces pollen. You can touch the stamen of the male flower with your finger and find that there is yellow powder on the tip of the finger, that is, there is mature pollen. Then remove the male flower, remove the petals, and gently rub against the stigma of the female flower. The stigma is evenly crushed, otherwise it will easily grow into a malformed melon.
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