Canterbury Bells plant profile
Campanula medium
A biennial flower for full sun.
Last updated .
When to plant
When to plant Canterbury Bells
Canterbury bells is a true biennial: it forms a low rosette of basal leaves the first year and sends up bell-flowered stems the second. NCSU says to sow seed in late spring or early summer for bloom the following year, mulch well through the first winter, and let some seed pods mature so the planting renews itself.
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Canterbury Bells in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Lifecycle
- Biennial
- Hardiness
- Zones 3a to 9bFind my hardiness zone
Common problems
Watch for these
Also watch for: snails, rust, heat intolerance.
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Campanula medium (Canterbury Bells)
North Carolina Extension Gardener Plant Toolbox (NC State Extension). Supports general reference. Checked 2026-06-18.