If you can tell which direction the roots are coming from, you may just be able to dig a trench on that side of your beds and slide a metal or semi-hard plastic root barrier down between the beds ...

Or, better yet, replace the turf with organic mulch such as shredded or chipped hardwood bark. Root barriers made of metal, plastic or fabric have been tried with some degree of success in slowing the ...

UOcean founder Chris Desai said the plastic floating barrier, which costs £25,000, would run from one river bank to another and dipped about 30cm into the water, allowing fish to pass under.