I've been trimming a rather rangy bush located right off my deck. Its long thorns have been tearing at my market umbrella. While hacking it down, I suddenly noticed tiny yellow cherry-sized fruits dangling from the branches. After looking the unfamiliar bush up online I discovered it was a cherry plum.
This explains why the birds keep visiting the tree. I plucked a few cherries and yum! They taste exactly like a delicious yellow plum. A lovely discovery. Apparently cherry plum is an ingredient in Bach's Rescue Remedy. Hm, I'll be trimming more carefully now.