Technical
The Dos & Don’ts of Japanese knotweed treatment
DO contact a specialist and start a treatment programme as soon as you are aware of it
DON’T damage it! The rhizome is grow into new plants. Damaging the plant can knock it into dormancy
DON’T uproot it! The underground rhizome system can extend up to 7m from the parent plant, and reach a depth of 3m or more
DON’T compost live material! A piece can grow into a new plant
DON’T treat the plant at the wrong undertaken during the growing season, which is typically during the months May – October but most
DON’T excavate previously treated
DO make sure that any boots or shoes that have come into contact with the weed are checked and washed thoroughly to ensure that
DO the area immediately. Having a fence will help minimise the risk of further
DO recheck any previously contaminated areas for up to 2-3 re-growth has occurred
DO who can implement a knotweed management plan
an insurance-backed warranty on all its indemnity cover for £5 million including structural damage cover.
“ 132 I PC OCTOBER/NOVEMBER 2016 Young stems of knotweed
Thinking long-term Bona fide
remediation firms will give customers the warranty and insurance that protects them throughout the remediation process
There have been a number of examples recently where previously treated knotweed, in the process of naturally biodegrading, has been excavated and disturbed. Knotweed is safe to leave in situ whilst it decays, but if disturbed by being excavated, re-infest or cross contaminate unless completely decayed.
highly successful if the correct chemical is applied at the right dosage rate at the right It is important to recognise that if any
works are planned within the contaminated necessary, this is especially important for large-scale sites that are being prepared for building works. customers to understand the long-term use
Knotweed stem
Knotweed leaf
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