PHLOX SPECIES AND HYBRIDS The backbone of the summer perennial border, most of the hybrids derive from American native species, by selecting a range of cultivars the blooming season can be extended from spring until frost. Phlox are at their best in rich soil in full sun, the fragrant flowers cut well and will perfume your house for weeks. We also are listing a number of the challenging western species, they will test the skill of the finest growers, and our patience as well, please don't call because you bryoides doesn't make a yard wide subulata mat, if there is even a few green shoots on a half dead plant you are doing better than most.