Marginally hardy in St. George. We've had mixed results at the garden. We have tried these over two seasons now and usually lose half of them in the winter. The ones that survive freeze back to the ground before regrowing in the spring. The beautiful summer blossoms persuade us to give them another chance. They recover best with full winter sun, preferably reflected heat from a wall or boulder. Your best bet is to treat them as an annual and cross your fingers that they come back.