Milky bellflower

Sun

Full sun to partial shade; afternoon shade is helpful in warmer climates.

Water

Keep evenly moist during growth and flowering. Water deeply during dry spells, especially in the first growing season.

Soil

Fertile, moisture-retentive but well-drained soil; tolerates clay, loam and chalk if drainage is adequate.

Height

3-5 ft (0.9-1.5 m)

Spread

2-3 ft (0.6-0.9 m)

Flowers

Early to late summer, sometimes continuing into early autumn; pale blue, lilac-blue or white.

Foliage

Green, pointed, toothed leaves carried along upright, branching stems; dies back for winter.

Growth

Moderate; forms a substantial flowering clump over two to three years.

Care needed

Medium

• Pollinators
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   2 ft (0.6 m)

3. After 2 years

   3 ft (0.9 m)

4. After 3 years

   4 ft (1.2 m)

   full size

About 3 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

Canada

Growth rate

Moderate

• Water at soil level during dry weather; do not let newly planted clumps dry out.
• Mulch in spring with compost, keeping it clear of emerging shoots.
• Use a light spring feed only if the soil is poor; excessive feeding encourages floppy growth.
• Fit twiggy supports or a perennial support around tall plants before the stems lengthen.
• Divide crowded clumps in spring every three to five years, or when flowering declines.

Pruning. Remove faded flower sprays to encourage further bloom and limit self-seeding. Cut dead stems close to the ground in late autumn or late winter, before new shoots emerge.

Early spring

Remove remaining dead stems before new growth becomes tall.

Spring

Plant or divide clumps, water well and mulch with compost.

Late spring

Install supports and check young shoots for slugs and snails.

Summer

Water during dry spells and remove faded flower sprays.

Early autumn

Remove unwanted seedlings; leave a few seedheads only if you want seed.

Late autumn

Cut down collapsed stems, or leave sound stems until late winter for sheltering insects.

• Plant in the middle or back of a mixed border for summer height without a dense, heavy outline.
• Combine with shrub roses and hardy geraniums for a layered cottage-garden planting.
• Repeat small groups among upright perennials to link blue, mauve and pink flowers through a border.
• Use beside a lightly shaded path or woodland edge where the soil remains moist.

Garden styles it suits: English country, Cottage garden, Romantic rose garden, Pollinator garden, Blues and silvers and Pastel border.

Plant it with: Shrub roses, Hardy geraniums, Astrantia, Phlox, Lady's mantle and Foxgloves.

Wildlife: The flowers provide pollen and nectar for bees, including bumblebees. Standing dead stems can shelter overwintering insects.

• Slugs and snails can strip emerging shoots: inspect at dusk, hand-pick and use wildlife-conscious slug controls where needed.
• Powdery mildew can affect leaves in dry, crowded conditions: water the soil during drought and divide congested clumps to improve airflow.
• Rust may cause orange-brown pustules on leaves: remove affected foliage and clear infected debris.
• Tall stems can flop in shade, rich soil or exposed sites: provide early support, avoid heavy feeding and choose a sheltered position.

Not known to be toxic to people, cats, dogs or horses; no parts are recognised as poisonous. It is an ornamental plant rather than a recommended food, and eating plant material may still cause digestive upset.

• Peach-leaved bellflower (Campanula persicifolia)

  Has narrow, peach-like leaves and larger, more widely spaced bells on relatively unbranched stems; milky bellflower carries many smaller flowers in branching sprays.

• Clustered bellflower (Campanula glomerata)

  Its flowers are packed into tight heads, usually deep violet, rather than the loose, branching sprays of milky bellflower.

• Creeping bellflower (Campanula rapunculoides)

  Has nodding purple bells arranged mainly along one side of a stem and spreads strongly by underground roots; milky bellflower forms a clump with branching flower sprays.

Campanula means 'little bell', referring to the flower shape, and lactiflora means 'milk-flowered', referring to the pale flowers.

Propagation. Divide established clumps in spring or take basal cuttings from young shoots in spring. Sow seed in spring; seedlings may differ from the parent, so propagate named cultivars by division or cuttings.

Accepted botanical name

Campanula lactiflora

In the US and Canada

Native in Canada. Introduced in the lower 48 states.

Native range

Iran, North Caucasus, Transcaucasus and Turkey.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.