perennial

Nettle-Leaved Bellflower

The Story

Plant Bio

Campanula trachelium, the nettle-leaved bellflower, is an upright, clump-forming herbaceous perennial characterized by its rough, bristly stems and coarse, deeply toothed foliage. During summer, it produces loose terminal clusters of nodding, bell-shaped flowers in shades of blue-purple, lilac, or violet.

This species is distinguished by its highly cold-hardy nature and its distinctive four-angled, unbranched stems that rise from a sturdy basal rosette of heart-shaped leaves. The rough-textured, nettle-like foliage provides a coarse, wild aesthetic that fits well in naturalized plantings.

Uses & Benefits:

Produces upright spikes of violet-blue, bell-shaped flowers that contrast beautifully with coarse, nettle-like foliage in cottage gardens.

Provides a robust, cold-hardy perennial option for partially shaded borders where delicate species struggle.

Attracts native bees, generalist insect pollinators, and hummingbirds with its nectar-rich, tubular blooms.

Essentials

At a Glance

Plant Type

Perennial

Height

36"

Width

24"

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Medium

Humidity

Moderate

Lifespan

Perennial

Native To

Europe, North Africa, Asia

Toxicity

Non-toxic (bristly hairs may cause mild mechanical irritation)

Bloom period

Summer

In flower about 3 months of the year

Planting

How to Grow

Select a planting site with rich, humus-rich, well-draining soil in full sun to partial shade.
Dig a hole twice the width of the root ball and set the plant so the crown sits level with the surrounding soil.
Water thoroughly at planting and maintain consistent moisture, especially during dry summer spells.
Apply a thin layer of organic mulch around the base to help retain soil moisture and keep roots cool.

Pro Tip

Plant in rich, well-draining soil with consistent moisture; allowing the soil to dry out completely in full sun causes rapid foliage scorch and leaf drop, while heavy, waterlogged clay triggers crown rot.

Keep It Thriving

Care Guide

Do

Keep the soil evenly moist to prevent foliage scorch and premature leaf drop.
Cut back spent flower spikes to the basal foliage after blooming to encourage a tidy habit.
Wear gloves when handling the plant if you have sensitive skin, as the bristly hairs can cause mild irritation.

Don't

Do not plant in heavy, poorly drained clay soils where waterlogged conditions cause root rot.
Avoid pruning aggressively into the dead, leafless woody crown bases.
Do not allow the soil to dry out completely during prolonged hot, dry summer periods.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Pest Check

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Cottage gardensWoodland bordersNaturalized areasPerennial borders

Companion Plants

Digitalis purpurea Alchemilla mollis Geranium pratense

Multiply

Propagation Methods

Good to Know

Common Questions

Nettle-Leaved Bellflower questions

What zones can Nettle-Leaved Bellflower grow in?

Nettle-Leaved Bellflower is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Nettle-Leaved Bellflower deer resistant?

Not reliably. Deer may browse Nettle-Leaved Bellflower, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Nettle-Leaved Bellflower bloom?

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

Does Nettle-Leaved Bellflower need full sun?

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