Clustered purple flowers form on upright, hairy stems in summer, lasting two to three weeks. The plant forms open clumps by spreading underground by rhizome. Best used in informal areas as it can be an aggressive spreader.
This plant has some cultivated varieties. Go to list of cultivars.
All common names:
Tree or Plant Type:
- Mixed border
- Large plant (more than 24 inches),
- Medium plant (12-24 inches)
- Full sun (6 hrs direct light daily),
- Partial sun/shade (4-6 hrs light daily)
- Zone 3,
- Zone 4,
- Zone 5 (Chicago),
- Zone 6,
- Zone 7,
- Zone 8
- Moist, well-drained soil
- Road salt
Seasons of Interest:
- late spring,
- early summer,
Flower Color & Fragrance:
Shape or Form:
Eighteen to twenty-four inches tall and about eighteen inches wide. Plant will grow wider over time as it spreads by rhizome.
Divide in spring or fall.
Deadhead plants to prolong the bloom time.
Do not prune in the fall, but leave the plant up until spring clean-up.
Can be somewhat short-lived.
Disease, pests, and problems
No serious problems, although the plant is attractive to slugs and snails.
Disease, pest, and problem resistance
Salt tolerant, deer and rabbit resistant
Native geographic location and habitat
Native to Europe. Plant in full or part sun and moist soil. In hot climates, prefers moist soil and part sun.
Attracts birds or pollinators
Butterflies, hummingbirds and other pollinators
Narrowly heart-shaped, alternate leaves with leaves at the bottom of the stem that have petioles (leaf stems). The leaves vary in size and are hairy both on the top and on the bottom of the leaf.
As many as fifteen starshaped flowers clump together at the top of the stem or where the leaves attach to the stem. Flowers are medium blue to purple and face upward.
Cultivars and their differences
Freya clustered bellflower (Campanula glomerata 'Freya'): A variety that sports a large number of lilac blue flowers from May until July on somewhat shorter stems.
Superba clustered bellflower (Campanula glomerata 'Superba'): Purple flowers on a more heat-tolerant plant.