I thought they spread from roots, but sure enough a few plants got fruit for the first time!
Lily of the valley set fruit
I h ave never seen that before. It will be interesting to see if the seeds germinate.
Mine have orange-red berries, too. I read that if you let them dry on the stem, there are 3 seeds in each toxic berry. They are sometimes viable, but plants are easier to propagate by root stock.