Perennial of the Polemoniaceae family, Phlox subulata is native to the eastern part of North America, where it colonizes rocky outcrops, dry slopes, and sandy edges, from the plains to the Appalachian uplands. 'Amazing Grace' is one of the most widespread and well-established white cultivars in specialized horticultural catalogs.
It forms a dense and regular carpet, reaching 8 to 12 cm in height, consisting of woody-based stems bearing linear-subulate, evergreen leaves, medium to dark green, prickly to the touch. During flowering, the foliage completely disappears under the flowers.
These are pure white to very slightly pinkish, with a distinctive small pink-violet eye in the center, slightly fragrant. Their fine texture and tight arrangement give the flowering cushion an almost mossy appearance. The purity of the white is particularly striking when combined with cultivars with purple or bright pink flowers, as can be seen in mixed rock gardens in spring.
In its natural habitat, the species' flowering extends from April to June. In cultivation under our climates, 'Amazing Grace' generally blooms in April-May. It requires full sun, well-drained soil, even poor and calcareous, and does not tolerate heavy soils or stagnant winter moisture.