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How to Grow Dahlia

Dahlia (Dahlia pinnata)

Ready to grow Dahlia?

Order seeds from trusted suppliers.

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🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🧤 Garden Gloves 🚿 Watering Can

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Find Your Dahlia Planting Dates

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🌿 Plant Overview

Scientific Name Dahlia pinnata
Category flower
Days to Maturity 90 days
Starting Method Start Indoors

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

18" apart

🌱

Depth

4" deep

📏

Height

18-60"

🌱

Germination

7-14 days

Ready to Grow Dahlia?

Find quality seeds from trusted suppliers.

🛒 Buy on Amazon 🌿 True Leaf Market

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Dahlia Planting Calendar by Zone

Zone 1a Zone 1b Zone 2a Zone 2b Zone 3a Zone 3b Zone 4a Zone 4b Zone 5a Zone 5b Zone 6a Zone 6b Zone 7a Zone 7b Zone 8a Zone 8b Zone 9a Zone 9b Zone 10a Zone 10b Zone 11a Zone 11b Zone 12a Zone 12b Zone 13a

Dahlia Planting Calendar by State

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Frequently Asked Questions

When should I plant Dahlia? +

Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant outdoors 1 weeks after the last frost. Use the search on this page to find exact dates for your ZIP code or city.

How long does Dahlia take to grow? +

Dahlia typically matures in about 90 days from planting. Exact timing varies by variety, soil conditions, and local climate.

Should I start Dahlia indoors or direct sow? +

Dahlia should be started indoors 6 weeks before the last frost date. This gives seedlings time to establish before being transplanted outside after frost danger has passed.

How much sun does Dahlia need? +

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

How far apart should I plant Dahlia? +

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

How much water does Dahlia need? +

Dahlia has regular (1-2 inches/week) water needs. Consistent moisture is important especially during germination and early growth.

About Dahlia

Spectacular blooms in every color and size from dinner plate to pompons. Plant tubers after last frost. Dig and store tubers in fall in zones below 8.

Expect your Dahlia to be ready for harvest in approximately 90 days from planting.

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