Common Names: Bell Flower, Harebell, Bluebell, Peach Bells, Canterbury Bells, Rampion. Family: Campanulaceae. Life Cycle: Hardy perennial. Hardy biennial. Sometimes as a hardy annual by gardeners. Height: 2 to 80 inches (5 to 200 cm). Native: Temperate Northern hemisphere.
Growing Region: Annual: Zones 3 to 10. Perennial: Zones 3 to 8 Flowers: Spring and/or summer to early autumn. Flower Details: Blue, pink, white, purple. Panicle. Bell shaped. Foliage: Variable; often broad at the base of the plant and narrow higher up the stem.
Sow Outdoors: Surface. Early spring (or early autumn in mild climates). Sow biennials in late spring or early summer. Spacing: Small species 5 to 10 inches (12 to 20 cm); Large species 15 to 20 inches (38 to 50 cm). Sow Indoors: Light (not direct sunlight). Germination time: two to four weeks. Temperature 70°F (21°C). Nine or ten weeks in advance of transplanting outdoors in early spring or early autumn. Biennials should be transplanted in the autumn.
Requirements: Full sunlight for best results (except in very hot areas then partial shade). Soil pH 6.5 to 7.5. Ordinary soils. Gritty soils in rockeries. Supply water in dry spells. Deadhead. Supply winter mulch of manure. Use a stake for tall species. Perennial species can be propagated form cuttings or by division in autumn or spring.
How to Grow Bellflower (Campanula)
Seeds of the Campanula plant should be sown on the surface in the early spring.
If growing bellflower and similar garden flowers from seed indoors, then they should be prepared about ten weeks before putting out.
They require two to three weeks to germinate. For gemination, Campanula should be grown in light, at a temperature of between 15 and 20°C (59 to 68°F).
The seedlings of bellflower should then be planted at a spacing of about 20 cm (8 inches; small varieties) or 40 cm (16 inches; larger varieties).
They should be located into an area of the garden that has full exposure to the sun, into a pH neutral soil, in the early spring.
Caring for Bellflower and other Campanula Plant Species in the Garden
Campanula plant species such as bellflower and Harebell require feeding in the spring, and regular watering in dry periods.
It is best to dead-head Campanula flowers to prolong their blooming season by encouraging further flowers.