Polemonium, Creeping Jacob's Ladder, Greek Valerian 'Blue Pearl'

Polemonium reptans

Family: Polemoniaceae (po-le-moh-nee-AY-see-ee) (Info)
Genus: Polemonium (po-le-MOH-nee-um) (Info)
Species: reptans (REP-tanz) (Info)
Cultivar: Blue Pearl



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


12-15 in. (30-38 cm)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Light Shade


Unknown - Tell us

Bloom Color:


Bloom Time:

Mid Spring

Late Spring/Early Summer


Grown for foliage


Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing the rootball

From seed; direct sow outdoors in fall

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Tuscumbia, Alabama

Des Moines, Iowa

Hebron, Kentucky

Pinconning, Michigan

Bridgewater, New Jersey

Port Washington, New York

Grand Forks, North Dakota

Williamsburg, Ohio

West Chester, Pennsylvania

Austin, Texas

Saint Albans, Vermont

Leesburg, Virginia

show all

Gardeners' Notes:


On Aug 5, 2011, bigyard from Rochester, MN wrote:

no problems so far, healthy in well drained soil and no special overwintering was provided (year 1). Has not required watering outside of the unusually heavy rain we've had tjhis spring/summer 2011. It is blooming again at present. (end July/august) Nice!


On May 4, 2008, ladychroe from Bridgewater, NJ wrote:

Wonderful ferny foliage all year, and a great companion plant for tulips. The delicate, abundant flowers are a medium blue-violet. They have a nice fragrance, but I only noticed it when I brought some indoors. Gets bigger every year, but has not shown any invasive tendencies in the three year that I'm had them.

This is a very good cutting flower and makes nice filler in tulip bouquets.

Mine grow in shade with maybe 2 hours of morning sun. The soil is dryish red clay. I found that they needed a fair amount of moisture while getting established, but did fine with just rainfall after that, even with a large greedy maple tree nearby.

Cut back by 1/2 for some rebloom.


On Mar 22, 2007, berrygirl from Braselton, GA (Zone 8a) wrote:

POLEMONIUM Reptans 'Blue Pearl' - Short 12" - Plant 12" apart. A great improvement over the old 'Jacob's Ladder'. It is a long lived plant with blue flowers and the divided foliage attractively arched. Very nice at the base of small shrubs or bush roses. The flower's fragrance draws people to wherever it is planted. Protect from late day sun.

General Information:
Avoid dry soil with full sun, fragrant, best selections for the coldest areas (zones 3&4), not for Gulf states.