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Kniphofia rooperi AGM

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© RHS

Characteristics

Plant type

Herbaceous Perennial

Habit

Bushy

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Red and Yellow in Autumn

Foliage

Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

1-1.5 metres

Ultimate spread

0.5-1 metres

Time to ultimate height

2-5 years


Preferred common name

Rooper's red-hot poker

Family

Asphodelaceae


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

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

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing
  • Exposed or Sheltered

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

Soil

  • Moist but well-drained or Well-drained
  • Acid or Neutral
  • Loam or Sand

Propagation

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

Suggested planting locations and garden types

City/Courtyard Gardens, Coastal, Cottage/Informal Garden or Flower borders and beds


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