Frequently Asked Questions

1. Can Japanese knotweed be successfully eradicated?

A. Yes, Japanese knotweed can be eradicated. The costs and timescales are dependent on site specific recommendations following a HIS site visit.

2. Does Japanese knotweed spread by the dispersal of its seeds?

A. No. Japanese knotweed spreads through the movement of rhizomes, the shoots that come from the root system, usually by tracked excavators, and occasionally by humans.

3. Can Japanese knotweed grow through concrete?

A. No. Japanese knotweed is a structurally damaging plant, but it cannot grow through concrete. Knotweed can push through small weaknesses and gaps in concrete, brickwork and other surfaces.

4. Can your solutions help save time and money?

A. Yes, we offer a range of invasive weed solutions that are customised to meet client’s budgets, and timescales.

5. Can you treat Japanese knotweed close to water courses?

A. Yes, Japanese knotweed can be eradicated close to water courses, when undertaken by a carefully designed programme that meets EA and SEPA regulations.

6. Are there financial implications if I delay treating Japanese knotweed?

A. Yes. For instance, Japanese knotweed herbicide treatment undertaken in 2009/2010 could be 10% of the cost of excavating and taking to a registered landfill.

7. Are the herbicides you use harmful to the environment, people and animals?

A. No. Not if applied in a responsible manner. All herbicides used by HIS are regulated by the EA, and all our Herbicide Application Technicians are trained and qualified.

8. I hear Japanese knotweed is edible. Is it true?

A. Yes. Apparently Japanese knotweed tastes like rhubarb.

9. Is Japanese knotweed poisonous?

A. No. But another invasive weed that H.I.S tackles, Giant Hogweed, is noxious and can cause serious burns.