There's a similar question here so because cherry tree roots are quite superficial and spreading, they can damage structures such as walls. So, keep the trees 20 feet from the wall.

There's a similar question here so because cherry tree roots are quite superficial and spreading, they can damage structures such as walls. So, keep the trees 20 feet from the wall.

Or, you could try growing the tree in an air-pot which would prevent surface root spread.

This is Prunus serrula 3-4 m high from a UK nursery, and other nurseries might have the Prunus you want.