The return of Mystery Guess

What am I?

Is it a bird? Is it a plane? No, it's the return of Mystery Guess, the blogospheres must irritating gardening quiz. If you've never played before, let me quickly explain the rules. I post a close-up picture and ask you to guess what it is. Simple. There are no prizes, medals or fanfares for winning, just the opportunity to crowned Mystery Guess Champion of the World. I usually post pics of plants, but this time around it's an item/thing/object that you commonly find in the garden...