Zucchini

Growing Conditions

Zucchini needs warm soil (60°F minimum), full sun, and warm temperatures throughout the season. It is one of the fastest-producing warm-season crops. Plants are large — allow 3–4 feet per plant. Two plants is typically sufficient for a family; more than three and you’ll be leaving zucchini on neighbors’ porches.

Cold climates: Direct sow after last frost once soil has warmed. Starting transplants indoors 3 weeks before last frost gets production started 2–3 weeks earlier.

Warm climates: Sow after soil warms; a second sowing in midsummer is possible for fall production.

Sowing & Planting

Sow 2–3 seeds per hill, 1 inch deep, thinning to 1 plant per hill. Space hills 3–4 feet apart. Or start transplants indoors in individual cells 3 weeks before last frost — handle roots carefully. Direct sowing is straightforward and produces nearly as fast as transplanting.

Care & Maintenance

Water at the base — wet foliage promotes powdery mildew. Water consistently, 1–1.5 inches per week. Feed at planting with compost; side-dress with balanced fertilizer when flowering begins. Remove any overripe fruit immediately — it suppresses further production.

Common Problems

Powdery mildew is inevitable late in the season — it doesn’t kill plants but reduces production and looks poor. Choose resistant varieties. Squash vine borers can be devastating in some regions — row cover until flowering prevents egg-laying. Blossom end rot from irregular watering. Poor fruit set early in the season is normal — plants produce male flowers first; female flowers (with a tiny fruit at the base) follow. Pollination requires both.

Harvest

Harvest at 6–8 inches for best flavor and texture. Check plants every 1–2 days at peak production — zucchini grows remarkably fast in warm weather. A single overlooked zucchini can reach 18 inches in 3 days. Regular harvest is the most important management task. Overgrown zucchini is edible but seedy and bland; best used for baking.

Varieties

Standard green zucchini (Black Beauty, Patio Star for containers) is reliable and widely available. Yellow zucchini (Golden) has a slightly milder flavor and is identical to grow. Patio/compact varieties suit small gardens and containers. Costata Romanesco is an Italian heirloom with excellent flavor and ribbed skin — slower growing but worth it. Round zucchini (Eight Ball, Cue Ball) are fun and productive, stuffed well for cooking.