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Herbaceous PerennialAnnual Biennial

Campanula thyrsoides

yellow bellflower

An upright biennial or short-lived perennial to around 50cm tall with a rosette of narrow, stiffly hairy, lance-shaped leaves to 12cm long. Unbranched, bristly and leafy stems develop in summer and bear a dense, fat spike of creamy-yellow, slightly fragrant, tubular flowers up to 2.5cm long

Other common names

thyrsoid bellflower

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Ultimate height

0.5–1 metres

Time to ultimate height

1–2 years

Ultimate spread

0.1–0.5 metres

Chalk

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

South–facing or North–facing or East–facing or West–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Campanulaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Genus: Campanula may be annuals, herbaceous or evergreen perennials, with bell or star-shaped, often blue, flowers in late spring or summer
Name status: Correct
Plant range: European Alps

How to grow

Cultivation

Grows best in a well-drained soil in full sun

Propagation

Propagate by seed

Suggested planting locations and garden types

Cottage and informal garden
Gravel garden
Rock garden
City and courtyard gardens
Wildlife gardens

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free but may be susceptible to rust, powdery mildews and a leaf spot

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