One of the most amazing summer perennials we grow is the native Berlandiera pumila ‘Chocoholic’. It is unfathomable to us, why this isn’t grown in every full sun garden where it’s winter hardy. The flowers, which smell like milk chocolate, top the 3′ tall clump nonstop from May until October. In the wild, Berlandiera pumila can be found from NC south to Texas, so its drought tolerance is excellent. We rate this as Zone 7a to 9b, but that’s only because we don’t have feedback from folks in colder zones yet. Please let us know is you have this survive temperatures lower than 0 degrees F without snow cover!