Photo by Melody

PlantFiles: Japanese Knotweed, False Bamboo, Mexican Bamboo
Fallopia japonica 'Crimson Beauty'

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

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

4 members have or want this plant for trade.


6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 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)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Scarlet (Dark Red)

Bloom Time:
Late Summer/Early Fall

Grown for foliage

Other details:
This plant is attractive to bees, butterflies and/or birds
Flowers are fragrant
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball

Seed Collecting:
Collect seedhead/pod when flowers fade; allow to dry

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By Kim_M
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1 positive
No neutrals
2 negatives

Gardeners' Notes:

Negative Erica1171 On May 17, 2010, Erica1171 from Newport, VA wrote:

It does not spread by seed in this part of the east coast (mountainous Virginia), but spread VERY easily when tiny bits of roots are moved (as in bulldozer work).

It is very hard to get rid of, too. VERY. 25% glycophosphate helps on cut stems. Applied on foliage, the plant laughs. Those little peices of roots keep expanding to bigger and bigger patches.

Negative dbelcher On Sep 27, 2009, dbelcher from Florence, SC (Zone 8a) wrote:

In South Carolina the Japanese Knotweed is listed on their Invasive Plant list as a Severe Threat.

Positive Kim_M On Aug 25, 2009, Kim_M from Hamburg, PA (Zone 6b) wrote:

This plant stays in it's place. But wherever the place is make sure it has a lot of room. It grows extremely fast. At first I thought it may be a bit invasive, but it isn't. Just a very fast strong aggressive grower.


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

Pelham, Alabama
Glen Ellyn, Illinois
Newburgh, Indiana
Clinton, Mississippi
Stratham, New Hampshire
Gilbertsville, Pennsylvania
Millersville, Pennsylvania
Charleston, South Carolina
Bristol, Tennessee
Loudon, Tennessee
Murfreesboro, Tennessee
Primm Springs, Tennessee
Bridgewater, Virginia
Faber, Virginia
Newport, Virginia
Norfolk, Virginia

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