So I went outside, watered the other beds, watered the lemon balm, and then....
I heard hissing.
I turned around to see a raccoon napping in the middle of my morning glories. No wonder they're looking trampled if it's a regular nap spot for a raccoon! Startled, I sprayed it with water, but it didn't do anything. I turned off the water and went inside to get my camera. It was still there when I got back, but my gardening is done for the evening. It hisses ominously at me, and I don't really want to mess too much with an angry raccoon just now.
Update: It occurs to me that I was awakened at sunrise by a fight on the deck between two raccoons. The one in the photo is still there, several hours later. Perhaps it was injured in the fight?