• 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

Matthiola incana

Brompton stock

Brompton stock

© © RHS

  • Other common names Brompton stock
    cluster-leaved stock

    common stock
    gilliflower
    hoary stock
    hopes
    queen's stock
    wallflower stock

    see more
  • Synonyms Matthiola arborescens
    Matthiola incana 'Brompton'

  • Family Brassicaceae

  • Genus Matthiola can be annuals, perennials or subshrubs, with simple or lobed leaves and dense terminal racemes or panicles of fragrant, 4-petalled flowers

  • Details M. incana is a woody-based perennial, sometimes short-lived, with narrow, grey-green foliage. Upright spikes of sweet-scented pink, mauve, purple, violet or white flowers, up to 2.5cm across, are produced in late spring and early summer. Many cultivars of this species are grown as annual or biennial bedding plants, or for cut flowers

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • Fragrance Flower

  • 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)

    H4

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Loam

    Loam

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilChalk, Loam, Sand

  • pHNeutral, Alkaline

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 Grow in a sunny, sheltered bed where the soil is well-drained and neutral to slightly alkaline

Propagation Propagate by seed sown in gentle heat in early spring or sow in midsummer and protect young plants over winter

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

How to care

Pruning Cut back after flowering

Pests Susceptible to aphids, flea beetles and cabbage root fly

Diseases May be affected by club root, a downy mildew, root rot and a virus

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