Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001143
11/12/99

Fallopia japonica--Japanese Knotweed formerly Polygonum japonicum (P. cuspidatum)


Hardiness Zones: 4 to 8
Height: 8 ft Spread: 24 in
Type: herbaceous perennial
Flowers: White

Comments: Japanese Knotweed may also be called False
Bamboo. It is a massive, thicket forming plant that can
become a tenacious, virtually indestructible weed. The
fleecy, white flowers are produced in late summer. The
plant is not suggested for the small landscape.

Propagation: Seed or division.

Cultivars:
'Compactum' (P. reynoutria) - A compact version only 3
feet tall that produces pink flowers. The leaves
turn red in the fall (Vis. 1).
'Glozam' (Glo-worm TM) - A cultivar of 'Compactum' or P.
reynoutria that produces pink flowers from mid-summer
until frost.
'Variegata' - Leaves green, white and pink (Vis. 2).

References for Cultivars: Walters Gardens 1999, Bailey
Nurseries 1999, Monrovia Nursery Company 1997, Lake County
Nursery 1999.


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