I want to plant raspberries between my neighbor's yard and my yard, where we both have lawns. How do I keep the raspberries from sending their roots over into our lawns and sprouting new plants?
Putting in a root barrier should do the trick. Don't be concerned so much with the material used for a root barrier, but rather the depth of the material. You will need to dig down at least 18 inches - preferably 2 feet - to put in the barrier. If you find raspberry roots at this depth when you dig, you may want to put the barrier deeper. Tin makes a good barrier. It is tough and durable and should be there forever. Ideally, you put in the barrier at the same time you plant the berries.