How to grow petunia
Petunia x hybrida
Get your exact dates
The windows below are relative to your frost dates. Enter your ZIP for the calendar dates.
Open the planting calendarWhen to plant petunia
Start seeds indoors10 weeks before your last spring frost to 8 weeks before your last spring frost
Transplant outdoorsat your last spring frost to 2 weeks after your last spring frost
Growing conditions
- Spacing
- 12 to 18 in apart
- Sun
- Full sun
- Water
- 1 in per week
- Soil pH
- 6 to 7
Common problems
Petunia by hardiness zone
Planting dates for a typical location in each zone:
Sources
Last updated 2026-06-11.