Overview
Linum catharticum is a bushy annual biennial in the genus Linum, part of the Linaceae family, with semi-evergreen foliage. Linum catharticum grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H4. Suggested uses include cottage and informal garden, patio and container plants, rock garden, gravel garden and flower borders and beds.
About
Linum catharticum, also known as purging flax, or fairy flax, is an herbaceous flowering plant in the family Linaceae, native to Great Britain, Iceland, central Europe and Western Asia. It is an annual plant and blooms in July and August. It is a known host of the pathogenic fungus flax rust (Melampsora lini). In the garden it prefers full sun and most soil types. In UK gardens it is hardy through an average UK winter (RHS H4). Suggested uses include cottage and informal garden, patio and container plants, rock garden, gravel garden and flower borders and beds. It tolerates soil of any pH, well-drained conditions and south-facing, east-facing and west-facing aspects. Plant out after last frost in fertile, well-drained soil.
Wikipedia contributors, CC BY-SA 4.0 — Linum catharticum
Growing conditions
Best soil and position for Linum
- Sunlight
- Full sun
- Soil type
- Chalk, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Well-drained
- Aspect
- South-facing, East-facing, West-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H4
Plant details
Linum catharticum size, habit and characteristics
- Plant type
- Annual Biennial
- Habit
- Bushy
- Foliage
- Semi-evergreen
- Suggested uses
- Cottage and informal garden, Patio and container plants, Rock garden, Gravel garden, Flower borders and beds
Care notes
Pruning and caring for Linum catharticum
- Propagation
- Seed, Stem-tip cuttings
- Pest resistance
- Slugs and snails, Aphids
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Linum catharticum?
Linum catharticum prefers full sun. It suits exposed and sheltered positions.
What soil does Linum catharticum need?
Linum catharticum is adaptable and grows happily in most soil types, including chalk, loam and sand. It is happy in soil of any pH. Aim for soil that stays well-drained.
Is Linum catharticum hardy in the UK?
Linum catharticum has an RHS hardiness rating of H4, meaning it is hardy through an average UK winter, tolerating -10 to -5°C.
How do I propagate Linum catharticum?
Seed, Stem-tip cuttings.
More in the Linum genus
- Linum capitatum

- Linum dolomiticum

- Linum flavumCrimean flax
- Linum monogynumNew Zealand native flax

- Linum narbonense 'Gentianoides'

- Linum nodiflorum

- Linum perenneperennial flax

- Linum rubrum