Pair of Colossus Red Gold Bicolor Marigold on a white background.
Marigold Seeds, Colossus Red Gold Bicolor
Marigold Seeds, Colossus Red Gold Bicolor
Marigold Seeds, Colossus Red Gold Bicolor
Close-up Colossus Red Gold Bicolor Marigold
Marigold Seeds, Colossus Red Gold Bicolor
Pair of Colossus Red Gold Bicolor Marigold on a white background.
Marigold Seeds, Colossus Red Gold Bicolor
Marigold Seeds, Colossus Red Gold Bicolor
Marigold Seeds, Colossus Red Gold Bicolor
Close-up Colossus Red Gold Bicolor Marigold
Marigold Seeds, Colossus Red Gold Bicolor

Marigold Seeds,
Colossus Red Gold Bicolor

4.828 ReviewsSKU: #FL334Min. seed count: 30
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Description

(Tagetes patula). Invite this bold French marigold into your garden and you will be rewarded with masses of gilded blooms that have natural pest-repelling qualities! This is the ultimate useful flower; the petals are edible, and it can repel garden pests such as whiteflies and nematodes. Try interplanting this beauty among your vegetable crops!

Growing Tips: Colossus Red Gold Bicolor marigolds deliver oversized, ruffled blooms in brilliant red with golden edges. These robust French marigolds are perfect for bold borders and striking containers. Ensure they receive plenty of sun and moderate water. Deadheading extends bloom life, while proper spacing promotes airflow and disease resistance, helping maintain the plant’s vibrant display.

Plant Details

Botanical Name
Tagetes patula
Life Cycle
Annual
Sun Requirement
Full sun
Days to Germinate
5–10
Days to Maturity
50–60
Planting Depth
¼ in.
Plant Spacing
8–12 in.
Ideal Temperature
65–80°F
Frost Hardy
No

When to Grow

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.'

How to Sow and Plant

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.

How to Grow

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.

How to Save Seeds

  • 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.

FAQ

What makes Colossus Red Gold Bicolor different from other French marigolds?

Colossus marigolds produce extra-large blooms compared to typical French varieties. Their bold red and gold color contrast adds dramatic flair to garden beds and container arrangements.

Can I grow Colossus marigolds in partial sun?

Yes, while they prefer full sun, Colossus marigolds will still flower in partial sun. Expect slightly fewer blooms and more stretched growth if grown in areas with less than 6 hours of direct sunlight.

Do Colossus marigolds perform well in summer heat?

Absolutely. These marigolds are heat-tolerant and continue blooming through hot summer months. Consistent watering and occasional deadheading help them maintain their lush, showy appearance even during heatwaves.

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