• 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

Lachenalia pustulata

blistered Cape cowslip

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
blistered Cape cowslip

© RHS

  • Other common names blistered Cape cowslip

  • Family Asparagaceae

  • Genus Lachenalia are bulbous perennials with strap-shaped, sometimes dark-spotted leaves, and erect stems bearing racemes or spikes of tubular flowers, slightly fragrant in some species, in autumn, winter or early spring

  • Details L. pustulata is a bulbous perennial to 35cm, with one or two lance-shaped leaves with small bumps on the upper surface, and racemes of narrowly bell-shaped, cream or yellowish flowers in late winter and spring

  • Plant range S Africa (W Cape)

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)

    H2

Colour

Sunlight

  • Full Sun

  • Aspect South-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilSand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0-0.1 metre

  • Time to ultimate height 2-5 years

How to grow

Cultivation Under glass, plant bulbs in a well-drained loam based compost (JI No 2) 10cm deep and grow in full sun. Introduce watering gradually until plants actively growing and then water freely. Reduce watering in autumn and keep dry over winter until growth resumes in spring

Propagation Propagate by seed sown as soon as ripe at 13-18C (55-64F) or by detaching bulblets in summer or autumn.

Suggested planting locations and garden types Patio & Container Plants

How to care

Pruning Remove old foliage as the plant dies down for the winter

Pests Generally trouble free

Diseases Generally trouble free

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