• 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

Lewisia tweedyi

Tweedy lewisia

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
Tweedy lewisia

© Janet Cubey

  • Other common names Tweedy lewisia

  • Family Portulacaceae

  • Genus Lewisia can be herbaceous or evergreen perennials forming rosettes of fleshy leaves, with panicles of open funnel-shaped flowers in a wide range of colours in spring and summer

  • Details L. tweedyi is an evergreen, rosette-forming perennial with fleshy, obovate leaves to 10cm in length and peach-pink to light yellow flowers 4-6cm in width, on stems to 20cm in length

  • Plant range Western N America

Characteristics

  • Foliage Evergreen

  • 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)

    H4

Colour

Sunlight

  • Partial Shade

  • Aspect West-facing or East-facing

  • Exposure Exposed

Soil

  • Loam

    Loam

  • Sand

    Sand

  • MoistureWell-drained

  • SoilLoam, Sand

  • pHAcid, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in moderately fertile, humus-rich, very well-drained, neutral to acid soil in light shade; a gravel top dressing helps to keep foliage dry. Protect from winter wet. Suitable for cultivation in a container in an alpine house

Propagation Propagate by seed sown in pots in a cold frame in autumn. Propagate by removing offsets in early summer

Suggested planting locations and garden types Rock Garden Patio & Container Plants

How to care

Pruning Deadhead after flowering

Pests Prone to aphids under glass and to slugs and snails outdoors

Diseases Prone to neck rot in wet conditions

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now

Get involved

We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.