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Growing Zucchini

Zucchini is the plant that convinces people they have a green thumb, then convinces the whole neighborhood they have too much zucchini. A couple plants is genuinely all you need.

Planting

Direct-sow after all frost danger has passed and soil has warmed to at least 60°F, usually late April into May for us. Zucchini germinates fast and grows even faster, so there’s rarely a good reason to start it indoors. Sow seeds an inch deep, two or three to a hole, and thin to the strongest seedling once true leaves show up.

Watering & feeding

Water deeply once or twice a week at the base rather than a little every day, wet leaves sitting in our humidity are an invitation to powdery mildew. Feed lightly every 3–4 weeks once flowering starts. If you’re seeing plenty of flowers but no fruit, that’s almost always a pollination problem, not a feeding one; hand-pollinate with a small paintbrush in the early morning if bees seem scarce.

Harvest

The real secret to good zucchini is picking it too early rather than too late, harvest at 6–8 inches while the skin is still tender, since anything bigger turns tough and seedy fast. One or two plants will out-produce a family, so plan on giving some away. Fair warning: squash vine borers are the one pest that can take a healthy plant down overnight here in South Carolina. If a vigorous plant suddenly wilts in the heat of the day even with wet soil, check the base of the stem for a small hole and sawdust-like frass. A second planting in early July, once the first round’s borers have moved on, is the most reliable way to keep zucchini coming through fall.

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