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How to identify Bohemian Knotweed. It’s even more rampant and vigorous in growth than … Japanese knotweed is a shrub-like, semi-woody perennial growing up to 9 feet tall. 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. Additionally no transportation, propagation, or sale is allowed. Both types can appear on the same plant. Also called Fallopia japonica (this name is commonly used in Europe and in the nursery trade). This knotweed is a cross between Giant knotweed and Japanese knotweed (hence its alternative latin name, Fallopia japonica x F. sachalinensis). Plants usually grow two to three metres high. Hybrid or Bohemian Knotweed Fallopia bohemica. Leaves can be up to 2.5 feet long, and flowers are greenish-white. 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. Background. Leaves are larger than Japanese knotweed, but smaller than Giant knotweed, and have short hairs on the underside. Japanese knotweed (Polygonum cuspidatum) The most ornamental of the knotweeds and shorter than Bohemian or giant. The hairs on the leaf undersides are short with broad bases. Giant knotweed and Japanese knotweed hybridize to form Bohemian knotweed (Fallopia Xbohemicum). 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. Description. Giant knotweed (figure 3) is taller than Japanese knotweed. 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. Japanese knotweed plants in Europe and North America are known to be clones of a single female plant. 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. Regulatory Classification. Introduced from Japan and China, this fast growing, invasive perennial has naturalized in some areas. Both types can appear on the same plant. Japanese knotweed (Fallopia japonica syn. Bohemian knotweed possesses higher variability than the parent species. Reynoutria japonica, Polygonum cuspidatum) Giant knotweed: Fallopia sachalinensis (syns. 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. Often Japanese Knotweed can grow upwards to 16 feet tall and spreads by means of its root system. Himalayan knotweed (figure 6) grows to 6 feet tall. Plants usually grow 2 – 3 metres high. It has green leaves which are either heart shaped or square ended. Japanese knotweed hybridizes with giant knotweed to form the Bohemian knotweed species. Japanese knotweed (Polygonum cuspidatum) Japanese knotweed is also known as Japanese bamboo, Japanese fleeceflower, and bamboo. The Japanese Knotweed is a bright green plant with a hollow stock similar to that of bamboo. 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