The chipboard/old door/lawn edging goes in vertical down about 6" @DorsetMark and helps stop the underground roots spreading. That's why I enjoy the bare soil - means I've won another bit back (temporarily mostly) to plant what I want!
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it." Sir Terry Pratchett
Thank you @Lyn, great idea and I have way more old plastic sacks than old doors. Sadly the piece of chipboard in the picture is on its last mission as the bottom has now rotted away - but plastic sacks now
Commiserations on the ground elder seems to be one of the very few weeds I don't grow
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it." Sir Terry Pratchett
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Commiserations on the ground elder
seems to be one of the very few weeds I don't grow