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Clustered bellflower

The flowers of clustered bellflower.

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.


Botanical name:

Campanula glomerata

All common names:

Clustered bellflower, Danesblood bellflower

Family (English):


Family (Botanic):


Tree or Plant Type:

  • Perennial

Native Locale:

  • Non-native

Landscape Uses:

  • Container,
  • Foundation,
  • Mixed border

Size Range:

  • Large plant (more than 24 inches),
  • Medium plant (12-24 inches)

Light Exposure:

  • Full sun (6 hrs direct light daily),
  • Partial sun/shade (4-6 hrs light daily)

Hardiness Zones:

  • Zone 3,
  • Zone 4,
  • Zone 5 (Chicago),
  • Zone 6,
  • Zone 7,
  • Zone 8

Soil Preference:

  • Moist, well-drained soil


  • Road salt

Seasons of Interest:

  • late spring,
  • early summer,
  • midsummer

Flower Color & Fragrance:

  • Blue,
  • Purple

Shape or Form:

  • Upright

Growth Rate:

  • Fast

More Information:


Eighteen to twenty-four inches tall and about eighteen inches wide.  Plant will grow wider over time as it spreads by rhizome.

Plant Care
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

Leaf description

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.

Flower description

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.

Fruit description

Small capsule

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.



Location of Campanula glomerata (Clustered bellflower) at the Arboretum

We do not seem to have this in our living collection.