Where's Tommy?

As we are going away for a few days soon, I thought I'd set the grandchildren the next gardening challenge which is to find Tommy. At this stage they don't know what Tommy is so it will require a certain amount of observational skills, the only rule is that they mustn't touch anything (more for safety than anything else). The winner gets a huge bag of Maltesers and if they don't find him I get to keep the sweets!