Aruncus is a spring and summer flowering perennial that is commonly known as goatsbeard for its white feathery flowers. It is hardy in USDA zones 3 to 8 and thrives in consistently moist soil and filtered shade to full shade and full sun exposures. Aruncus is well loved for its dramatic flowering and low-maintenance sensibilities. It will change color in the fall, providing visual interest well beyond bloom and should be mulched in the winter for protection.
Prune down aruncus stems in the late fall as they begin to look ratty or lose their golden foliage. Use your secateurs to cut down each stem to just a few inches above the level of the soil. Discard the cuttings in the compost bin.
Lay down a blanket of organic mulch over the crown of the plant, covering it with at least an even 2-inch layer of mulch. Use shredded bark, compost, well-aged manure or cocoa bean hulls for optimal insulation and nutrient-boosting effect for the soil.
Water your aruncus year round so that the soil never completely dries out. Supplement winter rainfall with irrigation as needed to maintain moist soil under the blanket of mulch. Refrain from fertilizing in the late fall and winter, and resume the feeding regimen in spring after the last frost has passed and new growth is just beginning to show.