• AGM plants

    AGM plants have been through a rigourous 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 'Royal Standard'

Red-hot poker 'Royal Standard'

AGM plants

AGM plants have been through a rigourous 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
Red-hot poker 'Royal Standard'

© � RHS 1988

  • Other common names Red-hot poker 'Royal Standard'

  • 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

  • Family Asphodelaceae / Asphodelaceae

  • Species 'Royal Standard' is a robust herbaceous perennial to 1m, with narrow, dark foliage and stout stems bearing bicolored spikes of bright yellow, tubular flowers opening from scarlet buds

Characteristics

  • Foliage Deciduous

  • Habit Tufted

  • 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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H5

Colour

Sunlight

  • Full Sun

  • Aspect South-facing

  • Exposure Exposed

Soil

  • Chalk

    Loam

  • Chalk

    Sand

  • MoistureMoist but well-drained

  • SoilLoam, Sand

  • pHAcid, Neutral

Size

  • Ultimate height

    0.5-1 metres

  • Ultimate spread

    0.1-0.5 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. 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 Coastal Gravel Garden

How to care

Pruning Old flower stems can be cut down after flowering

Pests Can be damaged by slugs and snails

Diseases Generally disease free

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