Once established, crown vetch provides an excellent, almost maintenance-free, cover for soil stabilization and slope beautification. It grows approximately two feet tall and blooms from June through September, producing pink to pinkish-purple flowers. Crown vetch is strongly rhizomatous (underground root stalks) and grows well on clay textured and shallow soils. It is highly recommended for low maintenance areas such as slopes around commercial or public buildings, highway and/or driveway slopes, lawn areas too steep for safe mowing and slopes associated with many recreational facilities or parks.
Powell, A. J. Jr., "Slope Stabilization with Crown Vetch" (1980). Agriculture and Natural Resources Publications. Paper 27.