Zinnia: when to plant and care
Direct sow after frost; choose mildew-resistant series.
| Botanical name | Zinnia elegans / Z. angustifolia |
|---|---|
| Type | annual |
| USDA zones | 2–11 |
| Sun | full sun |
| Water | low-moderate |
| Bloom | summer to frost |
| Mature size | 1–3 ft |
| Planting time | After the last spring frost |
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Frost-tender; cold soil stalls growth.
Example dates
| Place | Dates |
|---|---|
| Austin, TX (78701) | spring: Mar 17–Apr 7 |
| Atlanta, GA (30303) | spring: Mar 31–Apr 21 |
| St. Louis, MO (63101) | spring: Apr 8–29 |
| Chicago, IL (60614) | spring: Apr 17–May 8 |
| Denver, CO (80202) | spring: May 7–28 |
| Seattle, WA (98101) | spring: Mar 20–Apr 10 |
Every ZIP page has its own dates. Find your ZIP.
State plant programs
- Selected by the Texas Superstar® program (Texas A&M AgriLife Research and Extension), listed as “Fall Zinnias”
“Texas Superstar” is a registered trademark of Texas A&M AgriLife Research. Use ® on first mention, no logo, not in our titles/domain/brand. Phrase as “selected as a Texas Superstar® plant by Texas A&M AgriLife.” YardThisWeek is not affiliated with, sponsored by or endorsed by these programs. See state plant programs.
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Sources
Summarized in our own words from public extension publications.
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