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Falling Stars

Campanula isophylla (kam-PAN-yoo-lah eye-so-FYE-lah)

Family: Campanulaceae Unknown Herbaceous (1-3 ft)

Italian bellflower is a tender, trailing perennial native to northwest Italy and is a member of the bellflower family (Campanulaceae). It grows up to 8 inches tall with soft stems, heart-shaped, pale green leaves, and purplish-blue, star-shaped flowers. The genus name, Campanula, is derived from the Latin word campana , meaning bell, and refers to its bell-shaped flowers. The specific epithet, isophylla, is derived from two Greek words, isos, meaning "equal," and phyllon , meaning "leaf." This plant prefers full sun to partial shade and moist, well-drained, organic soils of chalk, sand, or loam. Acid to neutral pH is recommended. It is winter hardy in USDA Plant Hardiness Zones 7a to 10b. It is only marginally frost-hardy and is often grown as an annual or houseplant. They need about 15 hours of daylight before flower buds will develop. Supplementary artificial light can induce the plants to bloom a little earlier in summer. They require consistent moisture and should be watered regularly to keep the potting mixture thoroughly moist, but avoid overwatering. As a houseplant, use a potting mix with the addition of perlite or sand to promote drainage. Be careful when handling the stems and leaves, as they are very brittle. To encourage reblooming, pinch back the tips of the stems during their growing season, and cut dead stems to the base of the plant at the end of the growing season. This plant may be propagated by stem cuttings or division. The plant's ultimate height is from 4 to 20 inches tall and equally as wide. The brittle leaves have toothed margins and measure up to 1.5 inches long. The flowers appear during mid-summer to fall and grow upright, with bell or star-shaped blooms. They measure 1.5 inches in diameter. The flowers are usually purplish-blue, occasionally white. Italian bellflower is ideal for containers or hanging baskets. It is also recommended for use as a border, or for a cottage garden, patio, or greenhouse. Insects, Diseases, and Other Plant Problems: Monitor for slugs, snails, aphids, vine weevils, and spider mites. Susceptible to rust, leaf spot, and powdery mildew.

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 56 attributes.

How it fits the guild

Guild layer 4 - Herbaceous (1-3 ft) Optimal soil pH Acid (<6.0); Neutral (6.0-8.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Native alternatives Campanula divaricata

Full plant profile

Growing Conditions
Plant type
Annual; Ground Cover; Herbaceous Perennial; Houseplant
Life cycle
Annual; Perennial
USDA zones
7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b
Light
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
High Organic Matter; Loam (Silt); Sand
Soil pH
Acid (<6.0); Neutral (6.0-8.0)
Soil drainage
Good Drainage | Moist
Available space
12 inches-3 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 0 ft. 4 in. - 1 ft. 8 in. | Width: 0 ft. 4 in. - 1 ft. 8 in.
Growth rate
Rapid
Maintenance
Low
Canopy layer
4 - Herbaceous (1-3 ft)
Form & Appearance
Habit / form
Cascading
Foliage
Deciduous
Leaf color
Green
Leaf type
Simple
Leaf arrangement
Alternate
Leaf shape
Cordate; Ovate
Leaf margin
Serrate
Leaf size
1-3 inches long, 1-3 inches wide
Hairs present
No
Leaf detail
The leaves are small, bright green, heart-shaped with toothed margins, somewhat brittle, and measure up to 1.5 inches long. If stems or leaf stalks are broken, they exude a milky white sap.
Flower color
Blue; Purple/Lavender; White
Flower value
Long Bloom Season; Showy
Flower shape
Bell; Star
Flower size
1-3 inches
Flower detail
The flowers grow upright and are bell or star-shaped. They are usually purplish-blue, occasionally white, and measure 1.5 inches in diameter. The flowers bloom from mid-summer to autumn, continuing in succession for two or three months, becoming so numerous that they hide the foliage. Single flowers last 3-4 days.
Bloom time
Fall; Summer
Fruit type
Capsule
Fruit size
< 1 inch long
Stem color
Green
Stem detail
The stems are up to 12 inches long. They are trailing and may be trained upward on a small trellis.
Wildlife & Ecology
Native status
Unknown
Origin
NW. Italy (Coast SW. of Savona) in the Italian Alps
Distribution
Native: Italy; Introduced: Germany
Wildlife value
Attracts bees; members of the genus Campanula support the following specialized bee: Colletes brevicornis.
Attracts
Butterflies; Hummingbirds; Pollinators; Specialized Bees
Play value
Attractive Flowers; Colorful
Food & Medicine
Fruit type
Capsule
Landscape Use
Landscape location
Container; Hanging Baskets; Houseplants; Patio
Landscape theme
Cottage Garden; Pollinator Garden; Rock Garden
Design feature
Border
Garden tags
#specialized bees #nectar plant #pollinator plant #trailing #cascading #milky sap #houseplant #rock garden #delicate #hummingbird friendly #groundcover #butterfly friendly #partial shade tolerant #bee friendly #herbaceous perennial #container plant #wet soils tolerant #perennial #wildlife friendly #climber #patio #cottage garden #moth friendly
Problems & Resistance
Resistant to
Wet Soil
Propagation
Division; Root Cutting

Planted at Hunnicutt

Nobody’s planted this one yet.