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273
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Bloom calendar
Sapphire
Cultivar
At‑a‑glance
- Group/Class: Cultivar
- Height × spread: 12 to 20 in (30 to 50 cm) × 12 to 20 in (30 to 50 cm)
- Bloom window: late spring to early summer
- Color & flower form: sky blue; five petaled, saucer shaped
- Fragrance: 0 none
- USDA hardiness: zones 4 to 8
- Breeder / Year / Origin: unknown; recorded as ‘Blau Saphir’ in Europe
- Cut‑flower notes: Short stems; use as a light filler. Trials of perennial flax report about 9 days with preservative for L. perenne cuts.
- Pet safety: unknown
How it differs
- Shorter and denser than typical L. perenne.
- Useful in edging and pots where taller forms sprawl.
- Cold hardy for a cultivar and suited to northern gardens.
- Blooms heavily for several weeks in late spring.
Strengths
- Compact habit with steady bloom
- Performs in lean, well drained soils
- Tolerates light afternoon shade in hot sites
- Good choice for small spaces and rock gardens
Care in one minute
Site: full sun; light shade increases bloom duration in heat
Soil: well drained, low to average fertility
Water: low to moderate; avoid constant wetness
Feeding: none; excess fertility reduces bloom
Grooming: shear lightly after peak; leave some seed for renewal
Watch‑outs
- Short lived; allow some seedlings to renew clumps
- Petals fall by afternoon; normal for the genus
- Declines in poorly drained or highly fertile soils
Best uses (tags)
Provenance note
Listed by the Royal Horticultural Society as ‘Blau Saphir’ and grown in public gardens; exact breeder and year are unknown.
References
- RHS Plants: Linum perenne ‘Blau Saphir’ (‘Blue Sapphire’)
- Chicago Botanic Garden Plant Finder: Blue Sapphire perennial flax
- ASHS HortScience 2022: Perennial Flax as a Cut Flower
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