|'Moonlight' is a low-growing, evergreen perennial with lance-shaped, gray-green leaves. It is mat-forming, to 10 inches in height, and woody, spreading to 18 inches. Early spring to early summer flowers are pale sulfur-yellow. Branches are slender. Best grown in zones 6 to 8 as this plant is susceptible to cold. Tolerant of poor alkaline soils and full sun. Trim back after flowering.