Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00001143
01/01/98

Polygonum japonicum (P. cuspidatum)--Japanese Knotweed

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.                                  

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

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