perennial RHS Award

Clustered Bellflower

Campanula glomerata 'Superba'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

24 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Average to high

Lifespan

Perennial

Native To

Europe, Asia

Toxicity

Non-toxic to pets and humans

The Story

Plant Bio

Campanula glomerata 'Superba' is a clumping perennial known for its vibrant purple flowers and attractive foliage. This cultivar is particularly noted for its long-lasting blooms and ability to thrive in a variety of soils.

Bloom Period:

EarlyLate

Uses & Benefits:

Campanula glomerata Superba offers vibrant purple flowers that brighten borders and containers, attracting pollinators like bees and butterflies.

This perennial provides ground cover, preventing soil erosion while requiring minimal maintenance once established.

Supports local pollinator populations and promotes biodiversity in garden ecosystems.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck seeds into well-draining soil in early spring for best germination.
Mist cuttings regularly to keep humidity high during propagation.
Transplant seedlings when they have two sets of true leaves, usually after 6 weeks.
Water consistently to keep soil moist but not waterlogged.
Apply a balanced fertilizer monthly during the growing season.
Deadhead spent flowers to encourage more blooms throughout summer.

Pro Tip

Plant in partial shade for optimal flowering and to prevent leaf scorch.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil evenly moist 💧
Deadhead flowers to promote continuous blooming 🌸
Apply mulch to retain soil moisture and suppress weeds 🌱
Fertilize monthly during active growth periods
Divide clumps every 3-4 years for healthy growth

Don't

Avoid overwatering to prevent root rot ❌
Don’t expose to harsh afternoon sun in hot climates
Refrain from using heavy, clay-rich soil without amendment
Don’t forget to remove diseased or damaged foliage
Avoid stepping on wet soil to prevent compaction

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Colorful border plant with vibrant purple flowersWildflower meadow for naturalistic plantingContainer display for patios and balconies

Companion Plants

Echinacea purpurea Coreopsis tinctoria Lavandula angustifolia Salvia nemorosa Rudbeckia hirta

Multiply

Propagation Methods

Good to Know

Common Questions

Clustered Bellflower questions

What zones can Clustered Bellflower grow in?

Clustered Bellflower is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Clustered Bellflower deer resistant?

Yes — Clustered Bellflower is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Clustered Bellflower bloom?

Clustered Bellflower typically blooms in early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Clustered Bellflower need full sun?

Clustered Bellflower does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.