How to Grow Cosmos

Ready to grow Cosmos?

Order seeds from trusted suppliers.

🛒 Amazon 🌿 True Leaf

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🛠️ Supplies You'll Need

🌍 Flower Garden Soil ✂️ Pruning Shears 🧤 Garden Gloves 🚿 Watering Can

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Find Your Cosmos Planting Dates

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🌿 Plant Overview

Scientific Name Cosmos bipinnatus

Category flower

Type Annual

Days to Maturity 60 days

Starting Method Direct Sow

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Low-Moderate

↔️

Spacing

18" apart

🌱

Depth

0.25" deep

📏

Height

24-60"

🌱

Germination

7-14 days

Ready to Grow Cosmos?

Find quality seeds from trusted suppliers.

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🤝 Good Companions

CornSquashTomato

Cosmos Planting Calendar by Zone

Cosmos Planting Calendar by State

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Frequently Asked Questions

When should I plant Cosmos? +

Sow Cosmos seeds directly in the garden 0 weeks before your last frost date. Use the search on this page to find exact dates for your location.

How long does Cosmos take to grow? +

Cosmos typically matures in about 60 days from planting. Exact timing varies by variety, soil conditions, and local climate.

Should I start Cosmos indoors or direct sow? +

Cosmos does best when direct sown outdoors. Plant seeds directly in the garden at the appropriate time based on your local frost dates.

How much sun does Cosmos need? +

Cosmos requires full sun (6-8 hours) to thrive.

How far apart should I plant Cosmos? +

Space Cosmos plants 18 inches apart to allow adequate airflow and root development.

How much water does Cosmos need? +

Cosmos has low-moderate water needs. Consistent moisture is important especially during germination and early growth.

About Cosmos

Airy, feathery annual with daisy-like blooms in pink, white, and burgundy. Self-seeds readily, blooms prolifically all season, and attracts bees and butterflies.

Expect your Cosmos to be ready for harvest in approximately 60 days from planting.

Use the search above or browse by zone or state to find the perfect planting dates for your location.