PlantsPolemonium→Jacob's Ladder (Polemonium caeruleum)

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Partial or Dappled Shade
Partial Shade to Full Shade
Water Preferences: Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 7b
Plant Height: 15 to 24 inches
Plant Spread: 2 feet
Leaves: Deciduous
Flowers: Showy
Flower Color: Blue
Bloom Size: Under 1"
Flower Time: Spring
Uses: Will Naturalize
Wildlife Attractant: Bees
Resistances: Deer Resistant
Rabbit Resistant
Pollinators: Bees
Miscellaneous: Monoecious


Black Walnut Trees Are Not Your EnemyBlack Walnut Trees Are Not Your Enemy
By foraygardengirl on December 26, 2014

Trees are valuable and beautiful assets to the environment and to any landscape, and black walnut trees are no exception. They are lovely trees that provide delicious and nutritious nuts and one of the most valuable hardwoods. They are allelopathic, however, and many gardeners avoid them or get rid of them.

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Posted by Catmint20906 (PNW WA half hour south of Olympia - Zone 8a) on Aug 25, 2014 4:22 PM

Jacob's Ladder (Polemonium caeruleum) blooms a lovely clear blue in mid to late spring. It does well in moist, rich soil in part shade. Polemonium caeruleum dislikes hot summer weather, and the foliage often declines in mid to late summer. Bees are attracted to its blooms, particularly sweat bees. Syrphid flies, beneficial insects that feed on aphids, are also attracted to Polemonium caeruleum. The ancient Greeks used this plant as a medicinal herb.

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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on May 14, 2019 11:16 AM

This Common Jacob's-Ladder is native to Europe and northern Asia. It is the most common of the genus sold at conventional nurseries. It makes an upright clump. Its odd pinnate oval leaves are 11 to 27 on a whole leaf. The cup-shaped flowers in loose panicle clusters usually are blue, but can also be white or pink. It does not do well in hot and/or dry locations, and the foliage can brown during drought.

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MissMew On May 1, 1999 Obtained plant
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