The Botanical Diary
P
Flowers

Perennial Flax

Linum perenne
Also known asperennial flax, blue flax

Flax is one of the first plants domesticated by humans, dating back 9,000 years.

Regions
all regions
Colour
Блакитний, blue, white
Perennial Flax (perennial flax, blue flax)
🌸
Bloom
May–August
☀️
Light
Full sun
💧
Watering
Low
📏
Height
0,3–0,6 m
❄️
Hardiness
Zone 4

Perennial flax is one of humanity's oldest cultivated plants, domesticated over nine thousand years ago. This delicate perennial originates from the temperate regions of Eurasia and, thanks to its undemanding nature, has spread across the globe. Today it thrives equally well in gardens from the Carpathians to the Ukrainian steppes, requiring only a sunny location and minimal care.

The flowers of flax are truly delicate: transparent petals in rich shades of blue, azure, or occasionally white unfold like butterflies from May to August. Each flower lives for just a single day, yet the plant generously produces new blooms, making flowering appear continuous. The stems are slender and airy, reaching 30–60 cm in height—like a gust of wind frozen mid-movement. For those seeking greater variety in their garden, cultivars exist with different flower shades, though classic blue remains the most captivating.

Perennial flax is the ideal plant for the lazy gardener. It scarcely requires watering, tolerates drought with ease, and reliably returns year after year with renewed vigour. Winter protection is unnecessary—the plant confidently overwinters even in cold regions. Planted in a border with annuals or as a companion to ornamental grasses, flax creates an effect of lightness and natural beauty. If you cut the stems back to 15 cm after summer flowering concludes, you can often achieve a second flush of blooms.

This humble plant deserves your attention not merely for its beauty. Gazing at these delicate blue flowers, you touch upon the deep history of human civilisation—for it was from flax fibres that our ancestors wove clothing and sails millennia ago. Today, perennial flax reminds us that the most beautiful things are often the simplest.

Location & soil

Perennial Flax — planting & location

LightFull sun
Soil typewell-drained, рН 6–7,5
Planting timeApril або August
Plant spacing0,25–0,35 m
Planting depth8–10 см

Each flower lasts one day, but new blooms continue to form.

Water needs

How to water Perennial Flax

IntensityLow
FrequencyEvery 14 days (в)
Volume5–7
MethodAt the base

Drought tolerant.

Annual care

Fertilizing and pruning: Perennial Flax

Spring fertilizingApply a balanced mineral fertiliser in April.
Summer fertilizingNo feeding required.
Autumn fertilizingNo feeding required.
Pruning timeПісля першого цвітіння (до 15 см)
Pruning typeSanitary / омолоджувальна

Cut back to 15 cm; may bloom again.

Cold hardiness

Perennial Flax — winter hardiness & care

Hardiness zoneZone 4
Winter coverWinter protection not required.
Cover timing
Plant protection

Diseases and pests of Perennial Flax

Garden design

What grows well with Perennial Flax?

Сальвія, вероніка, Catmint