Wild and Weedy Wednesday: Bohemian Knotweed
I am sure many of you have heard of Japanese Knotweed , a huge plant that is considered one of the worst invasive species worldwide, growing up to 30cm a day and spreading by rhizomes deep in the soil. Well, we have something similar in our garden: Bohemian Knotweed . Reynoutria x bohemica. It is in fact a cross between Japanese Knotweed and Giant Knotweed. The leaves are much larger – up to 30cm – and a kind of elongated heart shape. It can grow to over three metres tall and the stems are extremely tough and hollow, resembling young bamboo shoots. It is actually a very attractive plant, and I expect that was why Japanese Knotweed was introduced to parks and gardens as an ornamental plant in the west in the 19th century – before they realized how rapidly it spread. Not only does it have beautiful foliage, the white flowers which open in August also look quite majestic the way they stand upright. (And in autumn the leaves often turn a lovely burnt orange colour.) Bohemian ...