Invasive Japanese Plant Named After Tied Shoelaces

This page is the CodyCross answer for the clue below from Photography, Group 2004, Puzzle 3 (Picture Frame).

Question is: Invasive Japanese Plant Named After Tied Shoelaces

and the answer is: KNOTWEED

Word Meaning:

KNOTWEED — Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers

Definitions from Wiktionary.