California Rose or California Wildrose is a perennial, deciduous shrub that can form thickets, growing up to 8 to 10 feet in height and width. It produces thorny stems topped with open-faced, pink flowers from May through August. This plant loses its leaves in the winter, and may grow berries, though not always. It can grow in full sun to shade, and though drought tolerant, this shrub grows best in moist soils near water.