Giant knotweed and Japanese knotweed hybridize to form Bohemian knotweed (Fallopia Xbohemicum). Often Japanese Knotweed can grow upwards to 16 feet tall and spreads by means of its root system. Japanese knotweed plants in Europe and North America are known to be clones of a single female plant. Leaves can be up to 2.5 feet long, and flowers are greenish-white. Plants usually grow two to three metres high. Japanese knotweed (Polygonum cuspidatum) Japanese knotweed is also known as Japanese bamboo, Japanese fleeceflower, and bamboo. It has green leaves which are either heart shaped or square ended. How to identify Bohemian Knotweed: It has green leaves which are either heart shaped or square ended. Hybrid or Bohemian Knotweed Fallopia bohemica. Bohemian knotweed is a hybrid between Giant knotweed and Japanese Knotweed, sharing characteristics of both parent species.It was introduced to Ireland as an ornamental plant but has become widespread as a pest plant, especially along rivers and roadways. It’s even more rampant and vigorous in growth than … Japanese knotweed hybridizes with giant knotweed to form the Bohemian knotweed species. Description. Japanese knotweed is a shrub-like, semi-woody perennial growing up to 9 feet tall. The Japanese Knotweed is a bright green plant with a hollow stock similar to that of bamboo. Gallery: Common names: Japanese knotweed (Japanese bamboo, sally rhubarb, fleeceflower, and Himalayan fleece vine, Mexican bamboo, false bamboo) Giant knotweed (sacacline, sakhalin knotweed) Bohemian knotweed (Japanese-Giant hybrid) Scientific Name: Japanese knotweed: Fallopia japonica (syns. Japanese knotweed, giant knotweed and Bohemian knotweed are Minnesota Department of Agriculture Prohibited Noxious Weeds on the Control List meaning that efforts must be made to prevent the spread of seeds or other propagating parts. Both types can appear on the same plant. Regulatory Classification. Also called Fallopia japonica (this name is commonly used in Europe and in the nursery trade). Introduced from Japan and China, this fast growing, invasive perennial has naturalized in some areas. Additionally no transportation, propagation, or sale is allowed. Background. The hairs on the leaf undersides are short with broad bases. Japanese knotweed (Polygonum cuspidatum) The most ornamental of the knotweeds and shorter than Bohemian or giant. Giant knotweed (figure 3) is taller than Japanese knotweed. Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has characteristics of both parents. Bohemian knotweed possesses higher variability than the parent species. This knotweed is a cross between Giant knotweed and Japanese knotweed (hence its alternative latin name, Fallopia japonica x F. sachalinensis). Leaves are larger than Japanese knotweed, but smaller than Giant knotweed, and have short hairs on the underside. Polygonum cuspidatum), an herbaceous perennial member of the buckwheat family, was introduced from East Asia in the late 1800s as an ornamental and to stabilize streambanks.Knotweed is a highly successful invader of wetlands, stream corridors, forest edges, and drainage ditches across the country. Hybridization: Bohemian knotweed is a hybrid between Jap-anese and Giant knotweed. Himalayan knotweed (figure 6) grows to 6 feet tall. Giant knotweed. The hybrids are fertile and back-cross readily, yielding a continuous range of variation between the characteristics of their parent spe-cies, including size, leaf bases and tips. 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