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Blue Flax

Linum lewisii

perennial herb View on Calscape

Care

Sun

full sun

Water

very low

Soil

Fast, Medium, Slow; Prefers sandy or loamy soils. Does not grow well in clay soils.

Size

2–3ft tall

Bloom

Mar-Aug

Foliage

Deciduous

Deer

Resistant

Container

Friendly

Flowers

Prized

Edible

Seeds used to extract linseed oil; seeds edible whole or ground

Native Range

Grasslands and open woodlands throughout California mountains and foothills, 500-6000 ft elevation, extending to Oregon and east

Care Guide

Planting

Plant Blue Flax in full sun and well-draining soil - this is non-negotiable. If you have clay soil, amend it heavily with sand or loam, or choose a different spot; this plant simply won't thrive in clay. Spring or early summer is ideal for planting in the Bay Area. Space plants about 1.5 feet apart since they grow quickly to 1–1.5 feet tall.

After Planting

Water weekly for the first summer to establish the plant, then drastically cut back - Blue Flax needs very low water once established and actually prefers dry conditions. After year one, you can forget about supplemental watering except during severe drought. The #1 mistake is overwatering; this plant will rot if kept consistently moist. Deadheading spent flowers will encourage blooming throughout summer, and you can cut back any leggy growth in late winter before new spring growth appears.

Visit Calscape for more information about Blue Flax

Endangered & Threatened Species Supported

Silvery blue butterfly Glaucopsyche lygdamus
CA: Threatened, CA Special Concern

California Threatened; Species of Special Concern

Monarch butterfly Danaus plexippus
CA Special Concern

California Species of Special Concern; monarch populations declining

Garita skipper Oarisma garita
CA Special Concern

California Species of Special Concern; limited distribution

Wildlife Supported

Insects

Larval Host · Year-Round

Larval host plant; endemic California species in semi-arid regions

Larval Host · Year-Round

Larval food plant for multiple generations; critical during spring/fall migration corridors

Nectar · Year-Round

Persistent nectarivore; multiple generations throughout warm months

mod Flax rust
Larval Host · Year-Round

Fungal pathogen; indicates plant presence and natural disease dynamics

Larval Host · Year-Round

Larval food plant; early-season emergence support

Larval Host · Year-Round

Larval development host; supports multiple broods in California

Where to Buy

East Bay Wilds

2110 Eighth St, Suite 202, Berkeley

Fri 9:30am-4pm (occasional Sat, call ahead)

1.5 mi (510) 409-5858 Website
Curious Flora

12040 San Pablo Ave, Richmond

Daily 9am-4pm

7.0 mi (510) 215-3301 Website