Linum grandiflorum 'Rubrum'

RHS Plant Profile

crimson-flowered flax

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Synonyms

Linum grandiflorum var. rubrum

Annual Biennial

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An erect, branching annual to 50cm high with narrow, grey-green, lance-shaped leaves and rounded, deep red flowers carried in loose clusters in summer

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1 year
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Loam Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–facing
Exposure: Exposed or Sheltered
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 & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Linaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright, Spreading branched
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
Name Status: Accepted

How to Grow

Cultivation

Grow in light, moderately fertile, humus-rich, free-draining soil in full sun

Propagation

Propagate by seed

Suggested planting locations and garden types

Cottage and informal garden
Gravel garden
Rock garden
Patio and container plants
Flower borders and beds

Pruning

Cut back after flowering

Pests

May be susceptible to slugs, snails and aphids

Diseases

Generally disease-free