Scarlet Flax red flower with dark central eye, a closed bud and dried stems against a green background
Flowers

Scarlet Flax

Linum grandiflorum

Also called red flax, flowering flax

Difficulty: EasyAnnual

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

Units
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
See all flowers
  • 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

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