Xanthorhiza simplicissima Yellowroot Description A simple but effective native plant that spreads via roots to form small colonies. Small purple flowers are borne in clusters in spring. Finely toothed foliage turns yellow in fall. Can handle full shade. Avoid clay soils. Characteristics Hardiness Zone: 4 Light requirements: Shade Height: 2-3' Native: Yes Sizes & Prices Size: 1 GALLON $16.98 Other Information All Yellowroot Yellowroot Xanthorhiza simplicissima Zone: 4 Shade HT: 2-3'