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Bransford, W.D. and Dolphia
Polemonium occidentale Greene
Western polemonium, Western Jacob's ladder
USDA Symbol: POOC2
USDA Native Status: L48 (N), CAN (N)
Western Jacobís-ladder is a 1 1/2-3 ft. perennial with basal clusters of dark-green, pinnately compound leaves. Its blue, bell-shaped flowers are crowded in an elongate, openly branched cluster.
The leaves resemble long ladders; the genus is known by the common name Jacobs Ladder. Leafy Polemonium (P. foliosissimum), which grows from Idaho and Wyoming south to Arizona and New Mexico, is somewhat leafier than Western Polemonium, the upper leaves not much smaller than those at the base.
Plant CharacteristicsDuration: Perennial Habit: Herb Leaf:
Dark Green Fruit: Size Class:
Bloom InformationBloom Color: Blue
Bloom Time: Jun , Jul , Aug
, WY Native Distribution:
B.C. & Alt., s. to CA
& CO; mostly e. of the Cascades Native Habitat:
Wet, open conifer forests or meadow edges; 3000-11,000 ft.
Growing ConditionsWater Use: High
Light Requirement: Part Shade
Soil Moisture: Wet
CaCO3 Tolerance: Low
Soil Description: Wet to moist, well-drained soils.
BenefitConspicuous Flowers: yes
PropagationDescription: Propagate by division or seed.
Seed Collection: Not Available
Seed Treatment: Stratify.
Commercially Avail: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2010-04-25
Research By: TWC Staff