The mystery plant is in a back flowerbed that usually doesn't get enough sun because the oak tree limbs shade the ground after a point in spring. But Dad trimmed the limbs last week and the struggling cane of rose is there and this mystery plant and mostly mum plants. There could be a plant or two Mom transferred from pots to outdoors but I don't know their names.
I'm hoping the sunshine is helping the plants all prosper and we'll have the bloom to id this mystery plant. Thanks for your help, GoJays! And for the name of the tiny flowers!

