Thanks everyone!
Sorry for late reply......life.
If you haven't already, hope everyone will try this winning plant.
I didn't even know it was part of the mum's group, but see the
resemblance. I've planted regular mums, but they never last more
than a season or two. But these find a spot every year on their own.
Happy to share seeds...very tiny....just send me your address, and I'll put some in
an envelope (free).
The blooms are petite, just 3/4", but so many, it really adds
to any garden.
To see it against other plants for size reference...
And this one grew & bloomed out of a crack in the rock.