Wonderful Quickly creeping groundcover sunny happy yellow flowers Zone 6-10 Perennial loves full sun to part shade. Also good for slope and erosion control and quite drought tolerant Cannot ship to California Washington Arizona Hawaii Oregon Landscapers favorite. Creeping St. John s wort often known as Aaron s beard is one of the most highly adaptable ground covers in the trade as it will spread vigorously to quickly cover a hillside or embankment even in conditions of shade. Morphology: A stoloniferous evergreen groundcover that grows to a height of 12 and a width of 24 . It bears simple opposite-arranged leaves which are ovate-oblong in shape and up to 2 - 4 long. The leaves are rich green in color in the summer but light yellow in the shade. The most notable feature of St. John s wort is the presence of 3 wide bright yellow flowers. Flowers consist of 5 petals surrounding a dense tuft of protruding yellow stamens that resemble an old fashioned shaving brush. Flowers are borne in groups of 2-3 and appear from July through August Adaptation: Easily grown in average medium well-drained soil in full sun to part shade. When it is grown in complete shade the plants simply don t flower. To maximize flowering give Aaron s beard as much sun as possible.