Leaves are larger than Japanese knotweed, but smaller than Giant knotweed, and have short hairs on the underside. It has green leaves which are either heart shaped or square ended. Regulatory Classification. Bohemian knotweed possesses higher variability than the parent species. Hybrid or Bohemian Knotweed Fallopia bohemica. Often Japanese Knotweed can grow upwards to 16 feet tall and spreads by means of its root system. Giant knotweed (figure 3) is taller than Japanese knotweed. Giant knotweed. Japanese knotweed (Polygonum cuspidatum) Japanese knotweed is also known as Japanese bamboo, Japanese fleeceflower, and bamboo. It’s even more rampant and vigorous in growth than … Japanese knotweed (Fallopia japonica syn. 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. 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. Himalayan knotweed (figure 6) grows to 6 feet tall. Description. Reynoutria japonica, Polygonum cuspidatum) Giant knotweed: Fallopia sachalinensis (syns. Also called Fallopia japonica (this name is commonly used in Europe and in the nursery trade). Additionally no transportation, propagation, or sale is allowed. 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. Plants usually grow 2 – 3 metres high. How to identify Bohemian Knotweed: It has green leaves which are either heart shaped or square ended. Plants usually grow two to three metres high. How to identify Bohemian Knotweed. Giant knotweed and Japanese knotweed hybridize to form Bohemian knotweed (Fallopia Xbohemicum). Leaves are larger than Japanese knotweed, but smaller than Giant knotweed, and have short hairs on the underside. 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. For example, Bohe-mian knotweed leaves are a blend of both parents- they are slightly longer than wide (about mid way between parents for size) and are typically shallowly cordate at the base. This knotweed is a cross between Giant knotweed and Japanese knotweed (hence its alternative latin name, Fallopia japonica x F. sachalinensis). Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has characteristics of both parents. 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. The hairs on the leaf undersides are short with broad bases. Hybridization: Bohemian knotweed is a hybrid between Jap-anese and Giant knotweed. Japanese knotweed (Polygonum cuspidatum) The most ornamental of the knotweeds and shorter than Bohemian or giant. Japanese knotweed hybridizes with giant knotweed to form the Bohemian knotweed species. 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 plants in Europe and North America are known to be clones of a single female plant. 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