Campanula Medium aka Canterbury Bells

Campanula Medium, commonly known as Canterbury Bells, is a charming old-fashioned garden flower treasured for its tall stems and elegant, bell-shaped blooms. The flowers open in beautiful shades of blue, purple, pink, and white, creating a romantic display in cottage gardens, borders, flower beds, and cutting gardens.

Blooming from late spring into summer, Canterbury Bells produce abundant flowers that attract bees and other beneficial pollinators. Their tall, graceful stems also make excellent cut flowers for fresh arrangements. As a biennial or short-lived perennial, plants typically produce foliage in the first year and flower the following year, making them well worth the wait.

Minimum Seed Count: 100
Days to Maturity: 12–16 months
Life Cycle: Biennial / Short-lived perennial
Height: 24–36 inches
Spread: 12–18 inches
Light: Full sun to part shade

Outdoor Sowing (Recommended)

When: Late spring to early summer, or late summer for flowering the following year.
How: Scatter seeds on the soil surface and press in gently. Do not cover—seeds need light to germinate.
Space: Thin to 12 inches apart once seedlings are established.
Water: Keep soil evenly moist until germination and establishment.

Indoor Sowing

When: 8–10 weeks before the last frost.
How: Surface sow on seed-starting mix. Do not cover the seeds.
Light: Provide bright light after germination.
Transplant: Harden off and transplant outdoors after the last frost, spacing plants about 12 inches apart.