The Story
Plant Bio
Campanula glomerata, commonly known as clustered bellflower, is a perennial plant characterized by its attractive blue flowers that bloom in clusters above the foliage.
This species is notable for its ability to thrive in poor soils and its deer resistance, making it suitable for low-maintenance gardens.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Europe
Toxicity
Non-toxic to humans and pets
Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Mist cuttings regularly to keep humidity high during rooting.
- Plant in well-drained soil with partial shade for optimal growth.
- Divide mature plants in early spring or fall to propagate new specimens.
- Mulch around the base to retain moisture and suppress weeds.
- Transplant seedlings carefully to avoid root disturbance.
Pro Tip
Use a layer of organic compost to improve soil fertility and promote healthy blooms.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil evenly moist 🌱
- Prune after flowering to encourage bushier growth
- Fertilize with a balanced liquid feed monthly during active growth
- Mulch to conserve moisture and suppress weeds
- Provide partial shade in hot climates
Don't
- Avoid overwatering to prevent root rot ❌
- Do not allow soil to dry out completely
- Refrain from heavy pruning during late fall
- Avoid planting in waterlogged soil
- Do not fertilize with high nitrogen in late fall
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Divide | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
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 4–7. 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.
More Campanula to compare
Birch Bellflower
Campanula x birchii 'Hybrids'
Blue Waterfall Bellflower
Campanula poscharskyana 'Blue Waterfall'
Carpathian Bellflower
Campanula carpatica 'Mix'
Dalmatian bellflower
Campanula portenschlagiana
Prichard's Variety Milky Bellflower
Campanula lactiflora 'Prichard's Variety'
Serrated Bellflower
Campanula poscharskyana 'Stella'
Keep exploring
Explore the genus
Hardy in your zone?
Grow Clustered Bellflower with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.