I was going to ask a similar question, except I already was planning on using root barriers. I remember finding somewhere
Online that sold them specifically for raspberries but of course I can't remember where now. I tried googling it and I did find some on amazon. They are tree root barriers and come in different depths. They are about $60 for the smallest roll and I want to make sure they are deep enough before I spend the $$ They come in 24" or less.
