Tragopogon porrifolius 'Sandwich Island Mammoth'

RHS Plant Profile
salsify 'Sandwich Island Mammoth'

Synonyms

Tragopogon porrifolius 'Mammoth'

Annual Biennial

A biennial which flowers in its second year, this can be grown for its ornamental flowers. These have mauve petals with a star of long green sepals around the edge. The blue-green leaves are long and narrow and it has a large, fleshy taproot which is edible, however this is best in its first winter before it has flowered. This variety is said to be the tastiest and remains good to use until March

Position

Full sun

Soil Types

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

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

Position

Full sun
Aspect
East–facing or North–facing or South–facing or West–facing
Exposure
Sheltered
Hardiness
H4
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
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
Unresolved

How to Grow

Cultivation

Grow in good light, in deep soil to allow for growth of the taproot. For more advice see salsify cultivation

Propagation

Propagate by seed. See sowing vegetable seeds

Suggested planting locations and garden types

  • Cottage and informal garden
  • Mediterranean climate plants

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free