Posted: 26/06/2015 at 08:55
Actually, Justin, I think you are on totally the right track. Just try googling tansy and wildlife together. Much better than perovsKia which I don't think would contribute much, but could be wrong there too as I think it is a wild plant in some part of the world. Could you put it in some other part of the school property to do it's good work? I can see a great future with you and the kids becoming dedicated guerrilla gardeners!
if you want it in your border just do it. It will be easy and effective and encouraging. You can hack at it another time. One thing I would not put in a border is comfrey tho bees love it.