SHORT ANSWER: Most commercially-available herbicides are ineffective when used on Japanese knotweed. Appropriate herbicides are required to get this invasive plant properly under control.

Japanese knotweed can be dealt with in several different ways, but treating the plant with herbicide is the most-used method. Herbicide application is less disruptive than excavation (which involves digging the plant up and either disposing of it at an approved landfill site or burying it in a geotextile membrane), and it's far more cost-effective as well. In general, we only recommend excavation when time is limited, e.g. when Japanese knotweed needs to be cleared ASAP so that a property sale can be finalised or so that building work can go ahead. Many sites are not suitable for excavation at all.

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You may be aware of the headaches that Japanese knotweed (Reynoutria japonica) can cause for homeowners unlucky enough to find it growing on their property. This pesky plant is notoriously hard to get rid of, and you can find yourself on the wrong side of the law if you help it to spread into the wild.

Image Source: Wikimedia Commons

But even if you already knew all that, the true scale of the UK's Japanese knotweed problem may stun you. This isn't a niche issue that only affects a handful of unfortunate landowners - according to a recent study led by Dr Ross Cuthbert of Queen's University Belfast, Japanese knotweed costs the UK economy a whopping £41 million every year. And that's a conservative estimate.

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Finding Japanese knotweed on your property can be alarming, especially if you've read those scary news articles about how much damage this invasive plant can cause and the amount it can knock off the value of your home.

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There are many benefits to a garden that's teeming with plant life. Not only can a beautiful garden make your property more appealing to buyers, some research suggests that tending plants is great for your mental health, plus your local bees will certainly appreciate all those flowers.

But there are some plants that no gardener wants to find in their flowerbeds. Certain species are renowned for their uncontrollable growing rate, or for the damage they're capable of causing. Some plants - such as Japanese knotweed - can even lead to legal trouble if you allow them to spread.

Come with us as we examine five problematic plants that you definitely don't want anywhere near your garden...

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Last year, we received an enquiry from the Llanharan Miners Hall in Rhondda Cynon Taf. They were concerned because Japanese knotweed had spread onto their land from a neighbouring property - quite a common problem, unfortunately - and they wanted to make sure the plant didn't get out of control.

Total Weed Control carried out a survey of the affected site and recommended a treatment programme, which is now in progress.

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