Growing Marigolds in Zone 3B

Marigolds are the gardener’s best friend — they repel pests, attract pollinators, and brighten any bed.

Zone 3B has a short growing season — start seeds indoors when possible and use season-extending techniques like cold frames and row covers.

Top Growing Tips

• French marigolds are best for pest control; African types are taller and showier
• Plant around tomatoes, peppers, and squash to deter pests
• Root secretions suppress nematodes — plant where you’ll grow tomatoes next year
• Deadhead spent flowers for continuous blooming
• Easy to direct sow or start indoors 6-8 weeks before last frost

Companion Planting

Good companions: tomatoes, peppers, squash, beans — almost everything!

Avoid planting near: none — marigolds are universal companions

Harvest Timeline

Flowering begins 50-60 days from seed; save seeds from dried flower heads

About Zone 3B

USDA Hardiness Zone 3B has an average last spring frost around May 15 and first fall frost around Sep 15. All planting dates above are calculated from these frost dates. Your specific location may vary — check with your local extension office for the most accurate dates.