(a.k.a. Japanese Knotweed, Giant Knotweed, Mexican or Japanese bamboo, fleeceflower)
- Thick green to reddish stems that look similar to bamboo
- Large bright green leaves ranging from egg to heart-shaped with a pointed tip
- Sprouts in April, grows to 15 feet tall or more by July
- Spikes of white flowers appear from July to September
- Seen in flood zones along rivers and creeks, also frequents ditches and yards
CAUTION–DO NOT MOW
Knotweed is considered extremely invasive. Tiny root fragments can produce new plants and often travel by waterways.
To date, knotweed has been treated along 27+ miles of the Calapooia River, and infestations in the lower watershed were inventoried and treated during summer 2009.
Resources on Japanese Knotweed