• 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

Lupinus arboreus

tree lupin

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
tree lupin

© RHS 2003

  • Other common names tree lupin
    yellow bush lupine

  • Family Papilionaceae

  • Genus Lupinus can be annuals, perennials or shrubs, with palmate leaves and showy terminal racemes of pea-like flowers

  • Details L. arboreus is a fast-growing medium-sized evergreen shrub with elegant palmate leaves and dense, erect racemes to 25cm in length, with fragrant, yellow flowers

  • Plant range W North America

Characteristics

  • Foliage Evergreen

  • Habit Bushy

  • Fragrance Flower

  • Toxicity All parts, particularly the seeds, may cause severe discomfort if ingested

  • 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

  • Partial Shade

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Loam

  • Chalk

    Sand

  • MoistureWell-drained

  • SoilLoam, Sand

  • pHAcid, Neutral

Size

  • Ultimate height 1-1.5 metres

  • Ultimate spread 1-1.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in well-drained sandy soil in sun or partial shade

Propagation Propagate by seed or basal cuttings

Suggested planting locations and garden types Flower borders and beds Cut Flowers Low Maintenance Cottage & Informal Garden Wildflower meadow Coastal

How to care

Pruning No pruning generally required

Pests Slugs, snails and aphids may be a problem

Diseases May be affected by powdery mildew

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