- Hardiness
- Grown as an annual in every zone
- Light
- Full sun
- Water
- Average, about an inch a week
- Size
- 6 to 18 in
- Blooms
- Spring to frost
- Colors
- purple, pink, red, white
- Start indoors
- 10 weeks before planting out
Growing tip. Spreading types such as Wave fill baskets and beds without deadheading. Feed every two weeks in containers.
When to plant petunia by zone
| Zone | Median last / first frost | When to plant |
|---|---|---|
| 3b | May 16 / Sep 25 | Plant outside: May 23 to Jun 27 Start seeds indoors: around Mar 14 |
| 4a | May 12 / Sep 28 | Plant outside: May 19 to Jun 23 Start seeds indoors: around Mar 10 |
| 4b | May 8 / Oct 1 | Plant outside: May 15 to Jun 19 Start seeds indoors: around Mar 6 |
| 5a | May 3 / Oct 5 | Plant outside: May 10 to Jun 14 Start seeds indoors: around Mar 1 |
| 5b | May 1 / Oct 10 | Plant outside: May 8 to Jun 12 Start seeds indoors: around Feb 27 |
| 6a | Apr 29 / Oct 16 | Plant outside: May 6 to Jun 10 Start seeds indoors: around Feb 25 |
| 6b | Apr 22 / Oct 22 | Plant outside: Apr 29 to Jun 3 Start seeds indoors: around Feb 18 |
| 7a | Apr 16 / Oct 25 | Plant outside: Apr 23 to May 28 Start seeds indoors: around Feb 12 |
| 7b | Apr 5 / Nov 1 | Plant outside: Apr 12 to May 17 Start seeds indoors: around Feb 1 |
| 8a | Mar 29 / Nov 7 | Plant outside: Apr 5 to May 10 Start seeds indoors: around Jan 25 |
| 8b | Mar 16 / Nov 14 | Plant outside: Mar 23 to Apr 27 Start seeds indoors: around Jan 12 |
| 9a | Mar 2 / Nov 26 | Plant outside: Mar 9 to Apr 13 Start seeds indoors: around Jan 1 |
| 9b | Feb 1 / Dec 9 | Plant outside: Feb 8 to Mar 15 Start seeds indoors: around Jan 1 |
Zones 10 and warmer have little or no frost. There, plant cool-season plants in fall and warm-season plants from late winter.
Similar annual flowers
SnapdragonFull sun · Grown as an annual in every zoneCelosiaFull sun · Grown as an annual in every zoneLantanaFull sun · Grown as an annual in every zoneMadagascar periwinkleFull sun · Grown as an annual in every zoneNasturtiumFull sun · Grown as an annual in every zoneSweet peaFull sun · Grown as an annual in every zone
Frequently asked questions
What zone does petunia grow in?
Petunia is grown fresh each year, so it fits every zone. What changes is when you plant. Find your zone by ZIP code.
How much sun does petunia need?
Full sun. Full sun means at least six hours of direct sun a day; part shade means about three to six.
Hardiness ranges, light and size are typical figures from university extension services and botanic garden plant records; a named variety can differ, so check its tag. Planting dates come from each zone's median frost dates (NOAA 1991 to 2020 climate normals) and the timing rules in how we check.