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Annual Biennial

Blackstonia perfoliata
  • RHS Plants for pollinators

yellowwort

An annual to 40cm tall, mainly found on chalky and limestone grasslands, sand dunes and in rocky places, with waxy, grey to bluish-green opposite pointed leaves fused around the stem. Butter yellow, cup-shaped flowers with 6 to 8 petals, closing in the afternoon, are produced in summer and autumn

Other common names
canri felen
Synonyms
Chlora perfoliata
Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
1–2 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Grey Silver Blue Green
Summer Yellow Grey Silver Blue Green
Autumn Yellow Grey Silver Blue Green
Winter
Position
  • Full sun
Aspect

South–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H7
Botanical details
Family
Gentianaceae
Native to GB / Ireland
Yes
Habit
Clump forming
Name status

Correct

How to grow

Cultivation

Grow in well-drained neutral to alkaline soil in full sun; a good coastal plant

Propagation

Propagate by seed

Suggested planting locations and garden types
  • Coastal
  • Cottage and informal garden
  • Wildflower meadow
  • Wildlife gardens
Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free

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