• 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

Hemerocallis 'Royal Mountie'

daylily 'Royal Mountie'

daylily 'Royal Mountie'

© RHS 1998

  • Other common names daylily 'Royal Mountie'

  • Family Hemerocallidaceae

  • Genus Hemerocallis may be evergreen or herbaceous perennials, with narrow, strap-shaped leaves and funnel-shaped flowers on erect stems in late spring or early summer

  • Details 'Royal Mountie' is a perennial to 1m in height, forming a clump with narrow leaves and slender stems bearing deep, blackish-crimson flowers to 15cm in width, with recurved segments fading to vivid yellow at base


  • Foliage Deciduous

  • Habit Clump-forming

  • 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)




  • Full Sun

  • Aspect South-facing or East-facing or West-facing

  • Exposure Exposed or Sheltered


  • Chalk


  • Chalk


  • Chalk


  • MoistureMoist but well-drained

  • SoilChalk, Loam, Clay

  • pHAcid, Alkaline, Neutral


  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in fertile, moist but well-drained soil preferably in full sun. Copes well with heavy clay. May need watering in spring to early summer in dry conditions to ensure flowering

Propagation Propagate by division in spring or autumn; evergreen types are best divided in spring

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

How to care

Pruning Deadhead to prolong flowering

Pests May be attacked by aphids, slugs, snails, gall midges, glasshouse red spider mite and thrips

Diseases May be subject to leaf rots and stem rots

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