We have a long spirea hedge next door running along the side of our fence.
It sends out suckers constantly which take a fair bit of time to remove.
I was considering burying some sort of barrier, e.g. a wall of slate along the side of the fence to stop the suckers coming through to our garden. Can anyone tell me if this would/could work and how deep would the barrier have to go to stop the suckers coming under the fence.
Many thanks