Photo by Melody

PlantFiles: Japanese Knotweed, False Bamboo, Mexican Bamboo
Fallopia japonica 'Devon Cream'

Family: Polygonaceae
Genus: Fallopia (fal-OH-pee-uh) (Info)
Species: japonica (juh-PON-ih-kuh) (Info)
Cultivar: Devon Cream

Synonym:Polygonum cuspidatum
Synonym:Pleuropterus cuspidatus
Synonym:Polygonum cuspidatum var. compactum
Synonym:Polygonum zuccarinii
Synonym:Reynoutria japonica

2 members have or want this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

24-36 in. (60-90 cm)

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)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Sun to Partial Shade
Light Shade

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Grown for foliage
Good Fall Color

Other details:
May be a noxious weed or invasive
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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By Happenstance
Thumbnail #1 of Fallopia japonica by Happenstance

By Happenstance
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By begoniacrazii
Thumbnail #3 of Fallopia japonica by begoniacrazii

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1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive Nordlund On Jul 10, 2004, Nordlund from Madison, WI wrote:

I've grown three of these plants in Southern Wisconsin for 4 years, two in partial shade and one in sun. The plant in full sun is larger at about 3 feet tall and three feet wide. In partial shade, the plants are closer to 2 feet tall and less dense.

They have not been invasive in ordinary garden soil. Occasionally, perhaps three times in as many years, a shoot has emerged 6 inches from the original plant.


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

Ben Lomond, California
Boulder Creek, California
Calistoga, California
Clayton, California
Fairfield, California
Mount Prospect, Illinois
Saint Paul, Minnesota
Media, Pennsylvania
Wilkes Barre, Pennsylvania

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