Blackstonia perfoliata

RHS Plant Profile
yellowwort

Other common names

canri felen

Synonyms

Chlora perfoliata

Plants for pollinators
Annual Biennial

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

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Gentianaceae
Native to GB/Ireland
Yes
Foliage
Deciduous
Habit
Clump forming
Genus
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