
Scarlet Flax
Linum grandiflorum
Also called red flax, flowering flax
Scarlet flax is an annual with deep red, saucer-shaped flowers that is usually sown right where it will grow. It likes full sun or partial shade and often self-seeds where conditions suit it.
Quick facts
- Germination time
- Not yet verified
- Germination temperature
- Not yet verified
- Sowing depth
- Not yet verified
- Spacing between plants
- Not yet verified
- Days to maturity
- Not yet verified
- Sun
- Full sun, partial shade
Mildly toxic to people Read the safety notes
Safety for cats and dogs: not yet verified.
By SeedBattle EditorsUpdated
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01 · Overview
About scarlet flax
Scarlet flax, also called red flax or flowering flax, is an annual herb with small, waxy leaves on erect stems. It grows about 4 to 20 inches (10 to 50 cm) tall and spreads up to about 4 inches (10 cm). Its loose clusters of deep red, saucer-shaped flowers appear in summer. In most sites it rarely lasts past one season, though it can grow as a perennial in its native Turkey.
Growing details
- Start indoors
- Not yet verified
- Sow outdoors
- Not yet verified
- Water
- Low
- Containers
- Not yet verified
- Height
- 10–50 cm4–20 in
- Spread
- Not yet verified
- Frost tolerance
- Hardy
- Soil pH
- Not yet verified
- Life cycle
- Annual
02 · How to grow
How to grow scarlet flax from seed
Sow the seed directly where the plants are to grow, in spring or autumn. Choose a light, moderately fertile, humus-rich soil that drains freely, in full sun. It grows best in average, well-drained soil in full sun or partial shade. Heavy clay soil can cause shallow roots that make it hard for the plant to get through winter.
03 · Care
Caring for scarlet flax
Cut some stems back by half, midway through the bloom period, to extend flowering. The plant is listed as tolerant of heat, humidity and drought.
At a glance
How scarlet flax compares with other flowers
Worked out from the growing facts of the 79 seeds in Flowers on SeedBattle.
- Scarlet Flax
- Each of the other flowers
- Their average
- HeightShorter than average
10–50 cm4–20 in
Average for flowers: 71 cm2½ ft, from 68 other seeds
04 · Problems
Common scarlet flax problems
The plant is generally disease free. It may be troubled by slugs, snails or aphids.
05 · Safety
Scarlet Flax safety
The seeds are the part listed as having low-severity poison characteristics for people, and they are said to cause inflammation and constriction of the throat. This warning applies to the seeds, not the flowers or leaves. No pet toxicity information is given for this plant in the pages used here.
Scarlet Flax questions
When should I sow scarlet flax seeds?
Sow the seed where the plants are to grow, in spring or autumn.
Does scarlet flax need full sun?
It grows in full sun or partial shade, and it prefers full sun.
Is scarlet flax an annual or a perennial?
It is an annual in most sites and rarely persists past one season, though it can grow as a perennial in Turkey.
Is scarlet flax poisonous?
Its seeds are listed as having low-severity poison characteristics, which may cause throat inflammation.
Quick answers
More scarlet flax questions
Short answers taken from the growing facts on this page.
How tall does scarlet flax grow?
Scarlet flax grows 10–50 cm4–20 in tall.
Can scarlet flax survive frost?
Yes. Scarlet flax is hardy.
How much water does scarlet flax need?
Scarlet flax has low water needs.
Side by side
Compare scarlet flax with…
Two seeds, every growing fact lined up, so you can pick the one that suits your space.
Flowers
More seeds like scarlet flax
Other seeds in the Flowers category.
Find your next seed to grow
Browse all 223 seeds by sun, difficulty or pot size, or line scarlet flax up against another seed.





