As we go into autumn, Japanese Knotweed will remain looking similar to late summer with tall stems and dark green leaves and white flowers.
As we approach late autumn the leaves start to go yellow and start wilting, this is a sign of the plant starting to pull all the nutrients from above ground into the plants rhizome (root system) below ground as the plant becomes dormant over the winter. Japanese Knotweed holds over 90% of its nitrogen in the plants foliage.
