Marigold Seeds,
Colossus Red Gold Bicolor

Start seeds indoors 4–6 weeks before your region’s last expected spring frost, or sow directly outdoors after soil has warmed. In warmer zones, a late summer sowing provides rich fall color. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

Sow Colossus marigold seeds 1/4 inch deep in loose, well-drained soil. Choose a planting site with full sun exposure. Keep soil consistently moist until germination occurs. Use a gentle misting method to avoid displacing seeds before they sprout.

Thin or transplant seedlings to 8–12 inches apart once they have 2–3 true leaves. Water regularly but avoid overwatering. These marigolds are heat-tolerant and thrive with minimal care. Apply a light, balanced fertilizer monthly and remove spent blooms to encourage ongoing flower production throughout the season.

• Wait for flowers to dry completely on the plant.
• Snip off the withered heads and place in a paper bag.
• Break apart the flower head to reveal long, slender seeds.
• Remove any chaff or petals.
• Store seeds in a cool, dark, dry place in a labeled envelope or jar.