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In spring, red/purple asparagus like shoots appear from the ground and grow rapidly forming canes. As the canes grow the leaves gradually unfurl and turn green. One of the tricks of Japanese Knotweed is how fast is actually grows in the early stages of spring. Very quickly, Japanese Knotweed stems can grow from small shoots to 10 feet (3 metres) in height. When it comes to Japanese Knotweed identification in spring, over a few weeks, the growth can look very different.
In summer, the plants are fully grown and mature canes are hollow with a distinctive purple speckle and form dense stands up to 3 metres high. The density of the plant can be seen at this stage making Japanese Knotweed identification in summer very easy. In late summer, the full bloom of the plant is actually very attractive with small white flowers.
In Autumn, Japanese Knotweed has a lot of similar identification traits as to that of summer. In the beginning of autumn, there will certainly still be a very good density of foliage on the plants. The leaves will begin to turn yellow in colour with a distinctive mix of green and yellow leaves within the foliage; the leaves will also begin to wilt.
In Winter, the flowers and the green of the leaves of Japanese Knotweed will die off, all that will remain are the bamboo type canes that will turn darkish red/brown, and die. The canes remain standing throughout the winter and can often still be seen in new stands in the following spring and summer.
Should you suspect the presence of any invasive plant on your property, we strongly recommend that for clarification purposes you contact us and a certified surveyor from the Japanese Knotweed Company will carry out a site survey.
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