Japanese knotweed has various stages of growth, meaning it can look very different (as you can see in these Japanese knotweed pictures), depending on the season. See our images below to identify Japanese knotweed in Autumn. In late spring, canes can reach up to 3 metres (10 feet) high. Japanese knotweed is an invasive weed which grows rapidly, forcing itself through concrete, brickwork, gutters, drains, patios and more. They're a luscious green colour and grow up to 200mm long. Short hairs can often be found on the veins, edges and undersides. You can book a Japanese knotweed survey here. Here is a selection of our latest pictures taken of Japanese knotweed surveys and removal projects we have been working on in Cornwall, Devon and Somerset. For more information on Japanese Knotweed, visit our what is Japanese Knotweed web page. Stems are usually green (though leaf stems can contain the distinctive knotweed pink) and have the characteristic ‘zig zag’ from node to node. The leaves also have scattered hairs (trichomes) on the undersides. Japanese knotweed can look very different throughout the year and can cause all different sorts of damage. It is widely distributed, with both male and female plants recorded in the UK. It is a closely related species to Reynoutria japonica, but less widely distributed outside of the Far East. Japanese Knotweed leaves look different within the different seasons, being a light green, or red colour in spring. Similar Images . Although similar in many respects to japonica (cane structure, distinctive ‘zig-zag’ shape of stems, similar growth habit, etc), it grows much taller (4-5 metres or 13-16 feet) and has much larger, elongated leaves. Romsey, The leaves grow in a heart-shape, having pointed tips and straight edges. Like knotweed, it gains its strength from an extensive underground stem system and can be extremely difficult to eradicate once it has taken hold. 269 Field End Road, Japanese knotweed leaves are shovel shaped (some people think they look heart shaped) with a point at the tip and staggered on the stem (one stem per node), creating a zig-zag stem growth pattern. By Paolo Martini on 2nd July 2019 (updated: 30th November 2020) in News. If we didn’t use cookies, every time you visited our site, it would think you are a new visitor, meaning that your web experience wouldn’t be as smooth or as fast. Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. It seems some lessons are slow to learn. Japanese Knotweed identification in winter is more difficult. Crown Street, Large Piece of Japanese Knotweed Rhizome. Japanese knotweed identification. The base of the leaves are deeply lobed, forming a heart shape. Knotweed flowers are small creamy-white and form in loose clusters (panicles) in late summer or early autumn. Leaf size can be variable, though conforms to the same long shape. This field is for validation purposes and should be left unchanged. See our images below to identify knotweed flowers. The leaves are fairly smooth, mid-green in colour, with a characteristic straight top edge, giving the leaf a shield or shovel-type shape. Japanese Knotweed goes by both latin names Polygonum cuspidatum (more common in North America) and Fallopia japonica (more common in Europe), with the latter accepted by “Flora of North America” (FNA, our definitive reference). Japanese Knotweed Identification – A Complete Guide. Download our Japanese knotweed identification guide, here (2.3Mb). Persicaria campanulata grows to a height of around 60-90cm (2-3 feet) and produces flowers mid-summer that remain until the autumn. 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