Patience is a virtue with this plant, it is classified biennial as it typically does not produce blooms until it’s second year.
Plant after all danger of frost and soil temperature has reached at least 65 degrees.
Canterbury bells prefer well drained moist soil so keep this in mind when planting and choose a location that tends to stay moist. In hotter climates they will do better with some shade. They prefer cool weather and low humidity but are cold sensitive as well. 1
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Canterbury Bells is a very hardy plant.These estimates for how long Canterbury Bells takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Average 14 days | Min 3 days | Max 361 days (14)
Average 109 days | Min 91 days | Max 113 days (8)
Average days | Min days | Max days (0)
Cups and saucers, Bellflower, Bluebell
1 “Perennial Overview: Campanula”http://www.sophisticatedgardening.com/perennial-overview-campanula-canterbury-bells.html