5 Seeds Clustered Bellflower Campanula glomerata Superba Perennial Flower

Clustered Bellflower is a hardy herbaceous perennial grown for its dense clusters of deep violet-blue, upward-facing bell-shaped flowers that sit atop upright stems. Campanula glomerata Superba forms tidy clumps of green foliage and blooms through early to midsummer, making it a dependable choice for borders, cottage gardens, and cut flower arrangements.
This perennial works well in mixed borders, wildflower plantings, and pollinator-friendly garden beds, where its clustered blooms add vertical color and contrast. It prefers consistent moisture during establishment and benefits from deadheading to encourage repeat flowering. Space plants so air circulates freely, and divide clumps every few years to maintain vigor.
Species: Campanula glomerata
Variety: Superba
Type: Herbaceous perennial
Plant_Habit: Upright clump-forming
Sun: Full sun to part shade
Soil: Well-drained, moist, fertile
Days_to_Harvest: Not applicable
Zones: 3-8
Germination: 14-30 days at 65-70F
Sowing: Surface sow, light required
Spacing: 12-18 inches
Notes: Cold stratification may improve germination