David Layland, founder and managing director, said: "We’re embarking on a public communications campaign that we’ve nicknamed ‘Gone But Not Forgotten’, because one of the biggest challenges, besides getting rid of the plant itself, is the amount of misinformation and misconceptions that exist in the UK.
"The biggest of these is the myth that once knotweed has been treated, the problem has gone away. In reality, without a proper warranty, insurance and long-term remediation strategy, your knotweed treatment can leave you just as much at risk as when you first spot the distinctive leaves."
He says herbicide is "by far the least expensive and a highly effective treatment method".
The UK’s mild, wet winter coupled with this year’s humid summer has encouraged the growth of the plant, he adds.He said: "If you have the right information and back-up from your knotweed professional, such as insurance and warranties, then you should have not only peace of mind but also the legal guarantee that solicitors and conveyancers are looking for to demonstrate the knotweed issue is under control."