• 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

Panicum virgatum 'Warrior'

switch grass 'Warrior'

switch grass 'Warrior'

© RHS 2002

  • Other common names switch grass 'Warrior'

  • Family Poaceae

  • Genus Panicum can be annual or perennial, evergreen or deciduous grasses, with flat, narrowly lanceolate leaves, with large finely branched panicles of small spikelets in late summer or autumn

  • Details 'Warrior' is a deciduous perennial grass forming a clump of flat, linear leaves turning yellow in autumn, and large purple flowering panicles


  • 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)




  • Full Sun

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

  • Exposure Exposed or Sheltered


  • Chalk


  • Chalk


  • Chalk


  • MoistureWell-drained

  • SoilLoam, Chalk, Sand

  • pHAcid, Alkaline, Neutral


  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in any moderately fertile, well-drained soil in full sun

Propagation Propagate by division in mid-spring

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden City & Courtyard Gardens Coastal Gravel Garden Patio & Container Plants Wildlife Gardens Prairie Planting

How to care

Pruning Remove dead foliage and old flowered stems in spring

Pests Generally pest free

Diseases Generally disease free

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