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Blue Flax Flowers

Standard · Linaceae

Blue flax is a hardy perennial with airy wiry stems and soft sky-blue five-petaled flowers that open in succession above fine foliage. Like scarlet flax, individual blooms are short-lived, but the plant keeps producing over a longer season once established. It is especially useful in sunny meadow plantings, dry borders, and low-input pollinator gardens. Key facts: 90–120 days to maturity, 8+ hours of sun, 6–8 " spacing. Can be grown in containers with care (3+ gallon minimum).

Updated April 19, 2026 · Backed by 3 cited sources
Overview

At a Glance

The essentials first: timing, light, spacing, seed-starting, container fit, and overall size.

Days to maturity
90–120 days
Sun
8+ hours
Full Sun, 8+ Hours
Spacing
6–8 "
between plants
Seed start
3–4 weeks
before transplant
Container
Possible
Needs 3+ gal minimum
Height
2–3 ft
at maturity
Planting window

Zone Planting Guide

Switch zones to see whether this plant is a strong fit, what frost timing looks like, and any extra notes worth planning around.

This card updates instantly with viability, frost timing, and any planting notes for your selected zone.

Resilience

Plant Health

Stress tolerance, resistance notes, and the most common problems to watch for as plants mature.

Tolerance
Heat: Moderate Cold: High Drought: High

Common Issues

Root Rot

Cause: Wet soil quickly weakens or kills plants.

Prevention: Use sharp drainage and avoid overwatering.

Lodging

Cause: Rich soil and crowding can make stems floppy.

Prevention: Keep fertility modest and thin seedlings.

Short Bloom In Heat

Cause: Hot dry spells shorten individual flowering flushes.

Prevention: Sow early and keep moderate moisture during bud formation.

Feeding & picking

Nutrition & Harvest

How hungry the plant is, what ripe harvest looks like, and how long the crop keeps after picking.

Feeding
Nutrition
Feeding intensityLight feeder
RecipesRoot Drench
Timing
Harvest

Cut stems when a few bright flowers are open, or let seed capsules mature for seed saving.

Expected yield0–0.25 lbs/plant
Storage3 days — Best used fresh; seed can be stored once capsules dry fully.
Plant relationships

Companion Planting

Helpful neighbors can support growth or deter pests. Keep antagonistic plants separated to reduce stress and competition.

Avoid planting near
Herb Fennel
What you'll need

Growing Supplies

Based on Blue Flax's growth profile -- recommendations matched to this variety's specific requirements.

Drip irrigation / soaker hose kit

Every gardener benefits from putting water at the root zone instead of on the leaves, because drip and soaker systems reduce foliar disease pressure by limiting leaf wetness and soil splash. A quality kit should include a backflow preventer, filter, pressure reducer, and UV-resistant tubing.

Source: Iowa State University Extension; Colorado State University Extension; UMass Extension

Soil test kit

A soil test gives a baseline for pH and nutrient status so gardeners can add only what the soil actually needs. Prioritize a mail-in or lab-affiliated kit whenever possible because extension guidance notes that laboratory testing is more accurate than instant readers.

Source: University of Maryland Extension; Purdue Extension; Montana State University Extension

Quality bypass pruners

Extension guidance favors bypass designs because they make cleaner, closer cuts on living tissue than anvil types. Look for hardened steel blades that can be sharpened, a comfortable grip, and a cutting capacity matched to real home-garden stems.

Source: University of New Hampshire Extension; Iowa State University Extension; Purdue University Extension

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Research

Sources

Reference material and extension guidance used to build this growing guide.

seed_catalog Seeds Nowuniversity Colorado State University Extensionreference Linum perenne horticultural references
Internal links

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