DibbleGrowing dahlias: from seed to harvest
Plant tubers a week after last frost once soil warms. Lift and store them before the first hard freeze in cold zones.
Planting dates for dahlias by zone
| Zone | Start seeds indoors | Sow or transplant | Harvest |
|---|---|---|---|
| Zone 3 | not needed | May 22 | August 20 |
| Zone 4 | not needed | May 17 | August 15 |
| Zone 5 | not needed | May 7 | August 5 |
| Zone 6 | not needed | April 28 | July 27 |
| Zone 7 | not needed | April 17 | July 16 |
| Zone 8 | not needed | April 4 | July 3 |
| Zone 9 | not needed | March 8 | June 6 |
| Zone 10 | not needed | February 7 | May 8 |
| Zone 11 | not needed | January 8 | April 8 |
These dates use typical frost dates for each zone. Dibble tunes them to your exact ZIP and lets you adjust frost dates for your own yard.
Companion plants
Good neighbors for Dahlia:
Family and rotation
Dahlia is in the asters family. Lettuce and many flowers. Marigolds and zinnias are excellent companions throughout the garden. Learn about crop rotation.
Related crops
Lettuce
When to plantZinnia
When to plantSunflower
When to plantMarigold
When to plantCosmos
When to plantCalendula
When to plant
Questions
When should I plant dahlias?
It depends on your zone. Dahlia is a tender crop, so the timing follows your last spring frost. Look up your zone in the table below for exact start, sow, and harvest dates, or open Dibble and enter your ZIP to get your own calendar.
How long does it take to grow dahlias?
About 90 days from planting to the first harvest, with a picking window of roughly 70 days after that.
What grows well with dahlias?
Good companions include Zinnia, Marigold.
Plant at the right time this season
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