PlantSowGrow
How to grow Flax (Scarlet)
Linum grandiflorum
🌸 Flower
🌱 Grown each year
Delicate, glowing scarlet saucers on slender stems, all summer. Lovely drifted through a sunny border or wildflower patch.
At a glance: Sow early April to late May.
When to sow, plant and harvest
JanFebMarAprMayJunJulAugSepOctNovDec
Sow outdoors
Flowers
Timed for a typical UK garden (last frost mid-April). The app uses your own town's frost dates.
Growing Flax (Scarlet): what it needs
- Light
- Full sun · 6+ hours a day
- Watering
- Water in dry spells; pots daily in summer
- Soil
- Light, well-drained soil
- Spacing
- 15 cm
- Height
- 40 cm
- In pots
- Grows well in containers
- Feeding
- Liquid feed every two weeks once flowering starts
- Hardiness
- USDA zones 2–11
- Difficulty
- Easy
Step by step
- Early April – late May · 2 weeks before the last spring frost
Sow Seeds Outdoors
Sow thinly where they are to flower, in a sunny spot, into raked, weed-free soil.
- 10–21 days after “Sow Seeds Outdoors” · Mid April – late April
Check Germination
Seedlings should appear in 10–21 days. Keep the soil moist. If sown outdoors, thin them to 15 cm apart once they have two true leaves.
- 49–79 days after “Check Germination” · Late May – late June
First Flowers
Take a photo for your journal!
- Mid October – early November · around the first autumn frost
Clear or Collect Seed
When frost blackens the plants, pull them up for the compost heap. Leave a few seedheads first if you want to save seed.
More flowers to grow
Photo: Henning Schlottmann (User:H-stt) / Wikimedia Commons (CC BY-SA 4.0)
