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Linum perenne

Family: linaceae
Common name(s): perennial flax
Hardiness ratings: USDA zone 2~5 - 8~9 This is a summary of the individual hardiness ratings given by the links below

General resources

Wikipedia. Online encyclopedia entry (if defined).
Google images. Web search for photographs.
The Plant List. Taxonomical lookup
Catalogue of Life. Taxonomical lookup

Links for Linum perenne

Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 4-9) (21 photos)
Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 4) (3 photos)
Garden.org - Community-assembled plant profile (2 varieties in database) (20 photos)
Heritage Perennials: Linum perenne Blue Sapphire - Profile with description and horticultural details. (zone 2-9) (1 photo)
Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 5-8) (4 photos). Also a page for 'Appar'.
NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (1 photo)
North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 4-9a) (2 photos)
Ontario Rock Garden Society - Germination information
Paghat's Garden: Linum perenne 'Sapphire Blue' - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (1 photo)

Linum perenne subsp. alpinum

Common name(s): Alpine Perennial Flax
Hardiness ratings: USDA zone 4 - 9

Linum perenne lewisii

Common name(s): Wild Blue Flax