Why Do Squash Leaves Turn Yellow?
Month-old plants looked good for about three weeks. Then, some smaller leaves began to turn yellow. Plenty of water. Are they in need of iron, or a specific fertilizer? Planted in garden soil with minimum cow manure.
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Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/squash/why-squash-leaves-turn-yellow.htm