My zucchini's turn yellow when small, what's wrong?
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The first thing that comes to mind is to much rain
Second thing that comes to mind, not enough rain. One inch all at one time per week should work well for anything in a garden.
If everything else is growing well it could be too much or not enough nitrogen
not enough pollination.....http://homeguides.sfgate.com/zucchini-turn-yellow-growing-102317.html