"Godzilla weed" is my own personal nickname for Polygonum cuspidatum, which goes by several other common names, including "fleece flower" or "fleeceflower"....
Photo of young fleece flower plants.
The most widely used common name for this weed is "Japanese knotweed
." Several other common names include the term, "bamboo," such as "Mexican bamboo." My nickname may never catch on with the general public, but anyone who has had to battle this weed knows that my "Godzilla weed" appellation is justified! "Fleece flower" is perhaps one of the plant's most unfortunate common names. For while its autumn flower does, indeed, look fleecy (click the following link for a photo:), "fleece flower
" is just too dainty a name for so tenacious a weed!