My garden is completely enclosed. I live on the outskirts of Lancaster, an old city (orig. Roman) with a castle in nw England. It needs to be enclosed for all the doggies in the family. Re. Volunteer plants, I have a volunteer holly tree that planted itself in the shadow of a huge fern. The fern hasnt grown this year so the holly is thriving. It must be five years old and has finally made it to 12inches tall, bless its little cotton socks!
Edit: the mummy gnome has reappeared. He is a Manchester City gnome and is currently closing on the one from the red side of Manchester. In the background you can see the holly as mentioned above, bless!