Tragopogon porrifolius

RHS Plant Profile
salsify

Other common names

oyster root, purple goat's beard, vegetable oyster, Jerusalem star, oyster plant

Annual Biennial Herbs - Culinary

A biennial herb up to1.2m tall with erect stem and 15-30cm long taproot. The stem and leaves are pale green and the leaves are linear with a grass-like in appearance. The young root is harvested in its first year and used as a vegetable. If left to flower, it will produce decorative, purple-pink round flowers resembling dandelions, 3-5cm in diameter

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or North–facing or South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Deciduous, Semi evergreen
Habit
Columnar upright
Genus
Tragopogon can be annuals or herbaceous perennials with grass-like linear leaves and large, dandelion-like yellow or purple flowerheads in summer
Name Status
Correct
Plant Range
Mediterranean

How to Grow

Cultivation

Grow in deep, light, free-draining soil in full sun. Can be naturalised in meadow, grown as ornamental or cultivated for the edible root harvested in winter. See salsify cultivation for more advice

Propagation

Grow from seed sown outdoors in late spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free. Seedlings and young plants may be susceptible to slugs and snails

Diseases

Generally disease-free