Physoplexis comosa

RHS Plant Profile
tufted horned rampion

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tufted horned rampion Dorling Kindersley 2003
tufted horned rampion RHS

Synonyms

Phyteuma comosum

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Alpine Rockery Herbaceous Perennial
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A tufted perennial to 8cm in height, with strongly toothed, ovate or heart-shaped dark green leaves and dense rounded umbels of bottle-shaped, dark purple-tipped, lilac-pink flowers 2cm in length

Position

Full sun

Soil Types

Chalk

Max Height

Up to 10 cm

Max Spread

0-0.1 metre

Size

Time to Maturity
2–5 years
Max Spread
0-0.1 metre
Max Height
Up to 10 cm

Growing Conditions

Chalk
Moisture
Well–drained
pH
Alkaline

Position

Full sun
Aspect
East–facing or South–facing
Exposure
Exposed
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)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Campanulaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Physoplexis are tufted herbaceous perennials with simple, basal leaves and terminal clusters of curious, spiky flowers in late summer
Name Status
Correct
Plant Range
Alps

How to Grow

Cultivation

Grow in gritty, poor to moderately fertile, sharply drained, preferably alkaline soil in full sun with some midday shade. Protect from winter wet; can be grown in a pot in an alpine house

Propagation

Propagate by division or by rhizome cuttings in spring

Suggested planting locations and garden types

  • Patio and container plants
  • Gravel garden
  • Rock garden

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free