• 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

Linum perenne

blue flax

blue flax

© RHS

  • Other common names blue flax
    perennial flax

    lint bells
    prairie flax

    see more
  • Family Linaceae

  • Genus Linum can be annuals, biennials evergreen or herbaceous perennials or shrubs, with clusters of funnel-shaped flowers over a long period in spring or summer

  • Details L. perenne is a semi-evergreen perennial with narrow blue-green leaves and pale blue saucer-shaped flowers, about 2.5cm across, in summer

  • Plant range Europe

Characteristics

  • Foliage Semi-evergreen

  • 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)

    H4

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Exposed or Sheltered

Soil

  • Loam

    Loam

  • Chalk

    Chalk

  • Sand

    Sand

  • MoistureWell-drained

  • SoilLoam, Chalk, Sand

  • pHAcid, Alkaline, 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 very well-drained soil in full sun; heat tolerant and good for hot, dry locations

Propagation Propagate by seed or stem tip cuttings

Suggested planting locations and garden types Wall-side Borders Gravel Garden Patio & Container Plants Rock Garden Cottage & Informal Garden Mediterranean Climate Plants

How to care

Pruning No pruning required

Pests May be attacked by slugs, snails and aphids

Diseases Generally disease free

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