Lisa, hearing about this really upset me, too. It is just so sad to think that someone who loves plants would have the gall to do this. Gardeners are supposed to be the best people in the world, or so I thought! I am so sorry that this happened
I agree with Becky regarding putting up a sign. And also adding that whoever took the other plants return them as they were not available for digging. If you already have your suspicions, that person probably comes around the school often and will see the sign. I think I would find out where they live and if they have the dl's, then call them out about it.
oooooh! I am getting madder and having more vicious thoughts the longer I type. I wish I could do something about this.