This sturdy native grows a single unbranched 3 to 5-foot-high stem topped by several bright 2-3" sunflower-like flowers. Prefers full sun and medium to dry soils. Its common name comes from the gummy, fragrant resin produced by members of the Silphium genus. Supports a variety of pollinators. Drought-tolerant. Photo by Krzysztof Ziarnek, Missouri Botanical Gardens (Creative Commons license).