grow · Grow

How to Grow Zucchini from Seed

Zucchini grows fast and produces abundantly when you start seeds indoors 2-3 weeks before your last frost, then transplant to warm soil with full sun. Plant seeds ½ inch deep, keep soil consistently moist, and expect your first harvest in 50-60 days. Each plant needs 3-4 feet of space and will produce for months with regular picking.

Total time: 35-45 days
Difficulty: Easy

Ingredients

½ inch deep seeds
2-3 weeks seed-starting mix
6-8 hours direct sunlight
1-2 inches water weekly

Step by step

Start seeds indoors. Plant seeds ½ inch deep in seed-starting mix 2-3 weeks before your last expected frost. Use biodegradable pots since zucchini roots hate disturbance. Keep soil at 70-75°F and seeds will germinate in 7-10 days.
Prepare your garden bed. Choose a spot with 6-8 hours of direct sunlight. Work compost or aged manure into the soil. Zucchini needs loose, well-draining soil that stays consistently moist but never waterlogged.
Transplant seedlings. Move seedlings outside when soil temperature reaches 60°F and night temperatures stay above 50°F. Plant the entire biodegradable pot 3-4 feet apart. Water thoroughly after transplanting.
Water consistently. Give plants 1-2 inches of water weekly, watering at soil level to avoid wet leaves. Mulch around plants to retain moisture and suppress weeds. Never let the soil dry out completely.
Watch for flowers and fruit. Plants flower in 35-45 days. Male flowers appear first, then female flowers with tiny zucchini at their base. Hand-pollinate with a small brush if you don't see many bees around.
Harvest regularly. Pick zucchini when they're 6-8 inches long and still tender. Check daily once production starts. Cut stems with a knife rather than pulling. Regular harvesting keeps plants producing until frost.

Tips & troubleshooting

Choose bush varieties if you have limited space - they produce just as much fruit in half the space
Plant marigolds nearby to deter squash bugs and cucumber beetles
If plants stop producing in hot weather, they'll often resume when temperatures cool in late summer
Harvest zucchini blossoms in early morning for stuffing - pick only male flowers and leave females to develop fruit
Watch for powdery mildew on leaves in humid weather - provide good air circulation and avoid overhead watering

Variations

Direct sowing. Plant seeds directly in garden beds after soil warms to 65°F. Cover with row covers if nights are still cool. This method works well in warm climates with long growing seasons.
Container growing. Use containers at least 20 gallons with drainage holes. Choose bush varieties like 'Eight Ball' or 'Patio Star' that stay more compact than vining types.
Succession planting. Plant new seeds every 2-3 weeks through early summer for continuous harvest. Stop planting 10-12 weeks before your first expected fall frost.

Questions

Why are my zucchini plants flowering but not producing fruit?: Early flowers are usually male and won't produce fruit. Female flowers appear later and have a small swelling at the base. Poor pollination can also cause fruit drop - try hand-pollinating with a small brush during morning hours when flowers are open.
How much space does each zucchini plant need?: Give bush varieties 3-4 feet between plants. Vining types need 4-6 feet. Zucchini plants spread wide and have large leaves that shade out weeds, so they use their space efficiently.
When should I start zucchini seeds indoors?: Start seeds 2-3 weeks before your last expected frost date. Zucchini grows quickly and doesn't like being root-bound, so don't start too early. In warm climates, direct sowing often works better than transplanting.
Why are my zucchini rotting on the vine?: Blossom end rot appears as dark, sunken spots and usually indicates inconsistent watering. Keep soil evenly moist and mulch well. Fruit rot can also happen when zucchini touch wet soil - harvest regularly and remove any damaged fruit immediately.
Can I save seeds from my zucchini for next year?: Yes, but only if you grew open-pollinated or heirloom varieties. Hybrid varieties won't produce true-to-type plants. Let one zucchini grow large and mature, then scoop out seeds, clean them, and dry thoroughly before storing in a cool, dry place.