Lewis Flax Plant Care
Linum lewisii Pursh
Updated · Sources · How we source care data
Linum lewisii is a perennial plant in the family Linaceae, native to western North America.
Every 7–10 days
Full sun to partial shade
60–80°F
40–60%
At a glance
How do you care for Lewis Flax?
Water Lewis Flax every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 40–60% humidity. Fertilize it every 6 months during the growing season.
Where Is the Lewis Flax Native To?
What Is the Lewis Flax?
Lewis Flax (Linum lewisii) belongs to the Linaceae family within the Linum genus. Lewis Flax is native to western North America. Lewis Flax is also known as Prairie Flax, Blue Flax.
Lewis Flax displays an upright, branching herb growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Lewis Flax produces delicate five-petaled flowers in shades of blue, pink, or white.
Leaf size: approximately 2 inches.
How Often Should You Water a Lewis Flax?
Linum lewisii requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Lewis Flax Need?
Lewis Flax thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Lewis Flax Prefer?
Linum lewisii grows best at temperatures of 60–80°F. Lewis Flax prefers humidity levels of 40–60%.
Temperature
60–80°F
Humidity
40–60%
What Soil Mix Works Best for a Lewis Flax?
Well-draining sandy loam with added organic matter. Good drainage is essential for Lewis Flax to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Lewis Flax?
Feed Lewis Flax every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Lewis Flax?
Repot every 1-2 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Lewis Flax?
Lewis Flax can be propagated through seeds, division of clumps. Similar propagation techniques also apply to pale flax plant care, which shares the same genus.
Is the Lewis Flax Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Lewis Flax, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Lewis Flax?
Lewis Flax is susceptible to aphids, spider mites, whiteflies. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Lewis Flax Need?
Lewis Flax grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Lewis Flax is native to western North America. In cooler regions, grow Lewis Flax as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Lewis Flax is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Linum genus — compare its care with other Linum species on PlantoScan.
Linum is part of the Linaceae plant family — browse all Linaceae genera and species.
Lewis Flax thrives in bright light and direct sun — see other bright-light plants.
More Linum Species
Other Linum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Linum lewisii Pursh, family Linaceae (first published in Fl. Amer. Sept. 1: 210 (1813)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Lewis Flax, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 13a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
Identify Plants Like the
Lewis Flax Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species