The lily-of-the-valley seem to be a law unto themselves. I tried to plant these within the brick circle around the tree trunk (the inner brick circle with moss) but these have decided to spread into the path (just to the right of Socks) rather than around the tree. No idea why. And why don't they grow from corms? No idea. I could only get these from the growing plants sold at Christmas, and a generous neighbour who had them growing like weeds.