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Polemonium caeruleum

Family: polemoniaceae
Common name(s): Jacob's ladder
Hardiness ratings: USDA zone 3~4 - 7~9

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 Polemonium caeruleum

• Asianflora - Plant photos. (1 photo)
• BBC Gardening - Plant profile with horticultural details and garden uses. (1 photo)
• Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3-7) (16 photos)
• Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 4)
• Garden.org - Community-assembled plant profile (4 varieties in database) (11 photos)
• Heritage Perennials: Polemonium caeruleum Brise d’Anjou™ - Profile with description and horticultural details. (additional pages for other varieties) (zone 3-9) (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 4-8) (1 photo). Also pages for 'Blanjou' BRISE D'ANJOU and 'Snow and Sapphires'.
• Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
• Paghat's Garden: Polemonium caeruleum 'Snow & Sapphires - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (2 photos)
• Rainy Side Gardeners: Polemonium caeruleum 'Brise D'Anjou' - Plant profile compiled by two gardeners in the Pacific Northwest. Includes propagation and pruning methods, and commentary. (zone 4-8) (1 photo)
• Rob's Plants: Polemonium caeruleum 'White pearl' - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (2 photos)

Polemonium caeruleum var. album

Links

• Ontario Rock Garden Society - Germination information (use search on page to find this taxon)

Polemonium caeruleum subsp. caeruleum

Links

• Ontario Rock Garden Society: Polemonium caeruleum ssp. caeruleum f. album - Germination information (use search on page to find this taxon)

Polemonium caeruleum subsp. dissectum

Links

• Ontario Rock Garden Society: Polemonium caeruleum subsp. dissectum f. album - Germination information (use search on page to find this taxon)

Polemonium caeruleum himalayanum

Links

• Ontario Rock Garden Society - Germination information (use search on page to find this taxon)

Polemonium caeruleum sspdissectum

Polemonium caeruleum subsp. villosum

Common name(s): Jacob's ladder

Links

• Rob's Plants: Polemonium caeruleum subsp. villosum 'Blue master' - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (3 photos)

Polemonium caeruleum subsp. yezoense

Common name(s): Purple-leaf Jacob's Ladder
Synonym(s): Polemonium yezoense
Hardiness ratings: USDA zone 3~5 - 7~9

Links

• Asianflora - Plant photos. (2 photos)
• Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3-7) (16 photos)
• Denver Botanic Gardens: Polemonium yezoense 'Purple Rain' - Description, native range, and cultural requirements. (zone 5)
• Digging Dog Nursery: Polemonium yezoense 'Purple Rain Strain' - Catalog page with descriptive information (zone 5)
• Garden.org: Polemonium caeruleum subsp. yezoense 'Purple Rain' - Community-assembled plant profile (13 photos)
• Heritage Perennials: Polemonium yezoense Bressingham Purple - Profile with description and horticultural details. (additional pages for other varieties) (zone 3-9) (1 photo)
• Missouri Botanical Garden: Polemonium yezoense 'Kaleidoscope' - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 4-8)
• Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
• Rob's Plants: Polemonium caeruleum ssp. yezoense - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 4-8) (3 photos)