Answer: Yellowing leaves on squash plants is quite common and can be caused by a variety of things, including transplant shock, over or under-watering and lack of nitrogen. Zucchini like rich, moist soil that's has plenty of organic matter and drains well. They need nitrogen at the start of their growing for green healthy leaves. Try fish emulsion for an organic source of nitrogen or use a balanced fertilizer, e.g., 10-10-10. Follow package instructions for application rates. Water well before and after applying. Squash are moisture sensitive and need a regular supply of water to thrive and produce fruit. How often to water depends on your particular soil's characteristics. You want to keep it uniformly moist, but not soaking wet, to a depth of 12-18 inches. Squash plants develop both male and female flowers. The pollen is transferred from the male to the female when insects such as bees visit the flowers. Although the female flowers will attempt to develop a fruit when the petals fall from the flower, if it was not completely pollinated, the immature fruit will die and drop from the plant. About the only thing you can do is encourage pollinating insects by having lots of colorful flowers in your garden to attract them, and by not using a lot of pesticides in your garden. I hope this information helps.
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