Dahlia illustration

Dahlia Growing Guide

Asteraceae family

Days to Harvest90 days
SunlightFull Sun
Frost ToleranceNone
Spacing18/sqft
Germination7-14 days
HardinessTender
Germ. Temp75°F
Start Indoors6 weeks before last frost

Planting Dates by Zone

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

Frequently Asked Questions

How long does it take to grow Dahlia?

Dahlia takes approximately 90 days from planting to harvest.

How much sun does Dahlia need?

Dahlia requires full sun (6+ hours direct sunlight per day).

How far apart should I plant Dahlia?

Plant Dahlia at 18/sqft using square foot gardening spacing.

Can Dahlia survive frost?

Dahlia is frost-sensitive and should not be exposed to frost.

How long does Dahlia take to germinate?

Dahlia seeds germinate in 7-14 days at an optimal temperature of 75°F.

When should I start Dahlia seeds indoors?

Start Dahlia seeds indoors 6 weeks before your last frost date, then transplant 2 weeks after last frost.

Plan Your Dahlia Garden

Track Dahlia from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Learn More