• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Kniphofia rooperi

Rooper's red-hot poker

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
Rooper's red-hot poker

© RHS

  • Other common names Rooper's red-hot poker

  • Family Asphodelaceae

  • Genus Kniphofia may be evergreen or herbaceous perennials, with linear or strap-shaped leaves and erect stems bearing a dense raceme of tubular, usually pendent flowers

  • Details K. rooperi is an evergreen perennial to 1.2m, with long, arching angled leaves and dense rounded spikes of tubular bright red flowers fading to yellow, in autumn

  • Plant range South Africa

Characteristics

  • Foliage Evergreen

  • Habit Bushy

  • 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)

    H5

Colour

Sunlight

  • Full Sun

  • Aspect South-facing

  • Exposure Exposed or Sheltered

Soil

  • Loam

    Loam

  • Sand

    Sand

  • MoistureMoist but well-drained, Well-drained

  • SoilLoam, Sand

  • pHAcid, Neutral

Size

  • Ultimate height 1-1.5 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Best grown in a sandy soil that has been enriched with humus, but any deep, moist but well-drained soil will do. Good drainage in winter is essential. Full sun is best; can tolerate partial shade but flowering is reduced

Propagation Propagate by division of established clumps in late spring. Propagate by taking offshoots from the crown

Suggested planting locations and garden types Flower borders and beds City & Courtyard Gardens Coastal Cottage & Informal Garden

How to care

Pruning Old flower stems can be cut down after flowering. Trim back old winter damaged foliage in spring

Pests Can be damaged by slugs and snails. Thrips may cause mottling of the foliage

Diseases Generally disease free, if winter drainage is good. Violet root rot may be a problem

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