Land Plants - invasive

Japanese Knotweed (Fallopia japonica) on Oct 4, 2018

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

Very large, alternate, heart-shaped leaves, stem with nodes like bamboo and purple spots, up to 10 or 12 feet high in spots, very small white flowers in a raceme. It is growing with a lot of Himalayan blackberry which is, of course, another invasive but that one is already widespread. (Sorry--no flower photos--I took these in June when I thought the city would help.)