Culture. Grow in dry, average to sandy, well-drained soils in full sun. Avoid heavy clay soils. Rots may develop in moist or poorly-drained soils. Best flowering is in full sun, however plant foliage appreciates some afternoon shade in hot summer climates.Cut back plants up to 1/2 after flowering to help maintain attractive form. In hot and humid summer climates such as the St. Louis area, this plant is difficult to grow well and can be very short-lived.his is a mat-forming perennial with woody roots that grows to 6-12” tall and features spatulate basal leaves (to 5” long) and smaller linear-oblanceolate stem leaves. Leaves are gray-green. Bright yellow flowers in corymbose panicles bloom in spring. Synonymous with and formerly known as Alyssum saxatile.