• 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

Althaea officinalis

marsh mallow

  • Other common names marsh mallow
    bismalva

    guimauve
    Joseph's staff
    mauve
    mortification root
    white mallow
    wymot
    wymote

    see more
  • Synonyms Althaea kragujevacensis
    Althaea taurinensis

  • Family Malvaceae

  • Genus Althaea are annuals or perennials with strong, wiry stems and broadly oval, lobed leaves. Sprays of small, pink to bluish-purple, five-petalled flowers are produced from summer to autumn

  • Details A. officinalis is a native, herbaceous perennial with softly hairy, grey-green leaves and stems. Small clusters of saucer-shaped, lilac-pink flowers appear on tall flowering stems from mid-summer to early autumn

  • Plant range Europe

Characteristics

  • Foliage Deciduous

  • 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)

    H6

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered

Soil

  • Clay

    Clay

  • Chalk

    Chalk

  • Loam

    Loam

  • Sand

    Sand

  • MoistureWell-drained, Poorly-drained, Moist but well-drained

  • SoilClay, Chalk, Loam, Sand

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 1-1.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Easy to grow and tolerates a wide range of conditions, though does best in fertile, moist but well-drained soil in full sun

Propagation Propagate by seed sown in mid-summer

Suggested planting locations and garden types Cottage & Informal Garden Wildlife Gardens

How to care

Pruning Cut down to ground once flowering is over

Pests May be affected by flea beetles

Diseases May be affected by a rust

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