DibbleGrowing zinnias: from seed to harvest
Sow zinnias once the soil is warm and nights stay mild. Cut often: the more you pick, the more they bloom. Space them for good air flow, which keeps mildew away in humid weather.
Planting dates for zinnias by zone
| Zone | Start seeds indoors | Sow or transplant | Harvest |
|---|---|---|---|
| Zone 3 | not needed | June 8 | August 6 |
| Zone 4 | not needed | May 31 | July 26 |
| Zone 5 | not needed | May 23 | July 17 |
| Zone 6 | not needed | May 17 | July 18 |
| Zone 7 | not needed | May 1 | June 30 |
| Zone 8 | not needed | April 7 | June 1 |
| Zone 9 | not needed | March 15 | May 8 |
| Zone 10 | not needed | March 18 | April 7 |
| Zone 11 | not needed | January 1 | March 2 |
Each date is the start of the best window from the same climate engine the Dibble app uses, run at typical places in each zone. Dibble tunes them to your garden's own location and lets you adjust frost dates for your own yard.
Companion plants
Good neighbors for Zinnia:
Family and rotation
Zinnia 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 plantDahlia
When to plantSunflower
When to plantMarigold
When to plantCosmos
When to plantCalendula
When to plant
Questions
When should I plant zinnias?
It depends on your zone. Zinnia 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 set where your garden is to get your own calendar.
How long does it take to grow zinnias?
About 60 days from sowing to the first harvest, with a picking window of roughly 70 days after that.
What grows well with zinnias?
Good companions include Dahlia, Tomato, Marigold.
Plant at the right time this season
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