We frequent LBI NJ and I've noticed these shrubs in many yards in Beach Haven covered with daisy-like flowers. They almost form hedges in some cases and seem to flower for an extended period of time.

Does anyone know what kind of bushes these are?

If so, do they only grow in sandy sea shore soil? Or could I grow them in eastern PA?

I haven't noticed them in my local nurseries, but maybe I'm not recognizing a small version in a pot?