When is the best time to treat
Japanese knotweed?

You may be wondering, when is the best time to treat Japanese Knotweed? Or, even how to treat Japanese knotweed? Carry on reading to find out:

When is the best time to treat japanese knotweed?

Japanese knotweed is similar to any other weed – it is best treated in late summer and autumn. The reason for this is that as with all perennials they start to absorb nutrients into the rhizomes as such by applying a herbicide at this time of the year it is far more likely to reach deep into the plant and kill the entire plant by applying at this time of the year. However, you can carry an excavation out year-round, if the location of the weed has been established. We will detail the treatment protocol we follow here at Japanese Knotweed Expert below. 

Spring

During this period, we don’t carry out any treatment however we do conduct site surveys. It is easiest to work out whether the plant is still present by examining the treated area for regrowth. Once we complete the 3-year treatment plan, there is then a monitoring period for 2 further years. It is important that inspections are completed during the growing season so that our surveyor can examine the area for regrowth.

Eradication of Japanese Knotweed in Middlewich
japanese knotweed in autumn

late Summer / Autumn

During this period, it is vital to apply the right concentration (dosage) of chemical to the plant. Typically we visit once in August, September, and October, spraying or injecting on each visit as long as there is viable growth. By applying our systemic herbicide which is significantly times stronger than weed killer that is available to the public. We find this highly effective in eradicating the Japanese Knotweed.

 

Additionally, at this time of year we carry out surveys and excavations as these can be done all year round.

free online identification

Don't spend money that you don't have to. Send us some photos of the suspected Japanese knotweed, and we will identify the plant for you, let us put your mind at ease.

Identification Time Frame

While there is a best period to treat Japanese knotweed, the plant can be identified throughout the winter period and a management plan can be put in place to start the following summer. However, early identification is crucial for a Japanese knotweed management. This is because there are recommendations in your management plan that you may wish to follow immediately.

For more information on how to identify Japanese Knotweed please see our identification guide.

Contact Us

In summary, if you are unsure if you have Japanese Knotweed or how to manage it, contact us to book in for a site survey. We will be happy to help in eradicating this invasive plant.

Contact us on 0800 133 7444 or complete our online contact form.

Moreover, we value customer feedback and offer fantastic customer service to all clients, to learn more about what our clients think, please view our testimonials page.

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Japanese Knotweed Expert