I think this is a S. splendens seed strain.

In this climate (close to yours) they prefer some morning sun, but afternoon shade. Rich soil, well draining, that is kept moist, especially during the heat is best. They do not like root competition.

The good side is that they sometimes overwinter in the ground, but they generally require more care than many other salvia that are better adapted here.

Good Luck and keep us posted.