Annual flower
Petunia plant profile
Petunia x hybrida
An annual flower for full sun.
Last updated .
When to plant
When to plant Petunia
Start seeds indoors
10 weeks before your last spring frost to 8 weeks before your last spring frost
Transplant outdoors
at your last spring frost to 2 weeks after your last spring frost
Growing conditions
- Sun
- Full sun
- Water
- 1 in / week
- Soil pH
- 6 to 7
- Lifecycle
- Annual
- Spacing
- 12 to 18 in apart
Common problems
Watch for these
Also watch for: petal blight.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Petunia (HGIC 1171)
Clemson Cooperative Extension, Home & Garden Information Center. Supports indoor seed-starting timing (normalized) and outdoor transplant timing (normalized). Checked 2026-06-11.
- Toxic and Non-Toxic Plants: Petunia (Petunia species) entry
ASPCA Animal Poison Control Center. Supports pet-safety verdicts for dogs and cats. Checked 2026-07-18.