Hi Frankie, this plant is in my eyes Aster ageratoides 'Adustus Nanus' and no Erigeron at all.
I have it more than 20 years and it has rather long runners. Take care to keep it at the place you want it.
When the runners are in other plants you cannot pull them away without damagint the other plant.
During the time I have it the name has sometimes been Kalimeris
have been looking again more carefully at the pictures and if the plant has no long runners I think I'm wrong and it is an Erigeron