Edging Lobelia plant profile
Lobelia erinus
An annual flower for full sun.
Last updated .
When to plant
When to plant Edging Lobelia
Edging lobelia performs best in cool weather but is sensitive to frost. UF/IFAS gives planting by calendar month and zone (for example May in zone 7, April in zone 8), and notes it ceases flowering when temperatures get too warm and recovers when they drop in early fall.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Edging Lobelia in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Lifecycle
- Annual
- Spacing
- 6 to 12 in apart
Common problems
Watch for these
Also watch for: damping off, stem rot.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Lobelia erinus: Lobelia, Edging Lobelia (FPS-351)
UF/IFAS Extension (Ask IFAS / EDIS). Supports general reference. Checked 2026-06-18.