Linum perenne
Perennial flax
Common names: Enduring flax, Blue flax
At a glance
- Light
- Full sun
- Lifespan
- Perennial
- Flowering
- Jun–Aug
- Hardiness
- Hardy
- Origin
- Native to Germany
This description was machine-translated.
Description
The perennial flax (Linum perenne) enchants from June to August with delicate sky‑blue flowers that open each morning and fade by the afternoon. Thin, flexible stems bear narrow, gray‑green leaflets, giving the garden a light, almost floating appearance. As a perennial, it is short‑lived, typically three to four years, but readily self‑sows, allowing it to persist on poor soil. It is well suited to rock gardens, gravel or prairie plantings and reliably attracts wild bees with its open flower cups. All plant parts are toxic if ingested, containing blue‑acidic compounds; plant it where children and pets cannot reach it.
Care instructions
Plant perennial flax in full sun on a warm site with well‑drained, somewhat poor soil. It does not tolerate waterlogging; add sand or grit to heavy soils. Water only during prolonged dry spells and fertilize sparingly or not at all, excess nutrients soften stems and make them brittle. Leave spent stems in place until autumn so seeds can disperse and new plants can grow the following year. A post‑flowering cutback in late summer keeps the clumps compact and encourages a second, lighter bloom.
The care notes were machine-translated from German.
Garden year
FloweringJun–Aug
Soil & site
Soil pH
Soil type
well-drained, lime-loving, lean, dry
Perennial flax likes it poor and well-drained, as in its natural habitats on dry grassland and limestone rocks. It hardly forgives heavy, waterlogged soils, which quickly lead to root rot. A lean, gravelly-sandy substrate with some lime produces the most compact and freest-flowering plant. Soil that is too rich makes it soft and short-lived.
Feeding
Light feeder
Perennial flax needs no additional feeding; on the contrary, too many nutrients harm it more than they help. A thin mulch of gravel or grit keeps the soil lean and well-drained, as it likes it. If anything, a handful of mature compost at the edge of the planting spot in spring is enough.
Overwintering
Perennial flax is hardy and survives frost in the bed without protection, as long as its feet stay dry. Wet in winter is the greater danger than cold, and a well-drained site prevents rot. In particularly heavy soils, a loosening layer of gravel around the root collar helps as additional protection.
Propagation
Methods
- From seed
- Cuttings
- Division
Sowing is easiest directly outdoors from mid-April to May, covering the fine seeds only lightly with soil. Alternatively, start the plants on the windowsill from March and prick them out later. Older clumps can be divided carefully in spring, but perennial flax does not tolerate root cutting particularly well and rewards a calm establishment phase. Basal cuttings in early summer are a gentle addition if you want to propagate a particular plant.
For your garden
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