Japanese Knotweed Identification

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How to Identify Japanese knotweed

When it comes to Japanese Knotweed identification, the different seasons throughout the year have a large part to play. Our handy identification videos and links below should give you a better insight on how to identify Japanese knotweed right throughout the year.

Japanese knotweed growth is usually at its most prolific from April to October, but mild winters and warm damp summers in recent years have seen the growing season extended. Early signs of growth are now seen in mid-March and new shoots have even been identified as late as November. This is why Japanese knotweed treatment or removal programmes often have to be reviewed annually to ensure the methods being used will continue to be effective.

When is the best time to Identify Japanese knotweed?

Watch the videos below to help you identify Japanese knotweed throughout the year:

How to Identify Japanese knotweed in Spring

Initially taking the form of an asparagus like spear, knotweed shoots will rapidly grow through the spring. Click on the link below to learn more about identifying Japanese Knotweed in spring

Identify knotweed in spring

How to Identify Japanese knotweed in Summer

Summer sees exponential knotweed growth. Bamboo like stems and a dense foliage will form. Click the link below to find out how to identify Japanese Knotweed in summer.

Identify Japanese knotweed in summer

How to Identify Japanese knotweed in Autumn

Knotweed stems will start turning brown and leafs will begin to wilt and turn yellow. Click on the link below for further information on identifying Japanese Knotweed in autumn.

Identify Japanese knotweed in autumn

How to Identify Japanese knotweed in Winter

Knotweed foliage will now be completely gone and the canes will die off. Click on the link below to understand how to identify knotweed that is preparing to grow again the following spring.

Identify Japanese knotweed in winter

How to Identify the Japanese knotweed Rhizome

The knotweed rhizome system can be found at depths of around 2m below the plant. It may also extend 7m laterally from a parent plant. Click on the link below to learn how to identify it.

Identify the Japanese Knotweed rhizome

Have you have identified Japanese knotweed?

If you have a suspicious looking plant growing on or near your property and want to know whether it is knotweed you can upload your photos directly to us and we will let you know whether you have knotweed or not.

Wise knotweed service

Free knotweed photo assessment

Have you seen a suspicious plant and want to know if it is the dreaded Japanese knotweed? Simply click the button below to upload your photos and we will get back to you with an answer.

Upload photos

Do you need professional help with Japanese knotweed?

If you are still unsure whether or not Japanese knotweed poses a threat to your property and you want to speak to an expert, simply contact us online, find your local branch or call Freephone 0808 231 9218 and speak to one of our qualified and experienced Japanese knotweed experts.

Alternatively, you can always book a knotweed survey and have one of our Knotweed specialists take a look.

Book a Japanese knotweed survey

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