Impatiens (incl. New Guinea): when to plant and care
Choose downy-mildew-resistant types where that disease occurs.
| Botanical name | Impatiens walleriana / I. hawkeri |
|---|---|
| Type | annual |
| USDA zones | 10–11 |
| Sun | part to full shade |
| Water | high |
| Bloom | spring to frost |
| Mature size | 1–2 ft |
| Planting time | After the last spring frost |
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.
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Sources
Summarized in our own words from public extension publications.
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