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How can I spot Japanese Knotweed during summer?
By Ross Cheeseright

How can I spot Japanese Knotweed during summer?

Question: How can I spot Japanese Knotweed during summer?

Answer: Look for tall canes growing 3 to 3.5m high, with large, shovel-shaped green leaves and clusters of creamy-white flowers, forming a dense canopy of lush green foliage.

A Closer Look: 

Identifying Japanese Knotweed (Fallopia japonica) during summer requires attention to its distinctive features amidst the season’s lush vegetation. One of the most notable characteristics is its tall canes, which can grow between 3 to 3.5 meters high. These canes are bamboo-like, hollow, and segmented, often with a reddish-brown speckling that becomes more pronounced as the plant matures.

In addition to its impressive height, Japanese Knotweed has large, shovel-shaped green leaves that can grow up to 200mm in length. These leaves form a dense canopy, creating a lush green cover that stands out in the summer landscape. By late summer, the plant produces clusters of creamy-white flowers that appear in elongated panicles, adding to its distinctive appearance. Spotting these features can help differentiate Japanese Knotweed from other similar-looking plants and ensure timely and effective management​

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