72 Microseasons of the Pacific Northwest

Black cottonwood (Populus trichocarpa), the largest North American poplar and one of the fastest-growing deciduous trees in the PNW, lines every major river corridor from the Willamette to the Fraser. In late February, its large, pointed buds begin to swell and split, releasing a thick, golden-yellow resin that coats fingers and carries an extraordinary fragrance — a sweet, balsamic, honey-and-cinnamon scent that traditional herbalists call "Balm of Gilead" and that many Pacific Northwesterners describe as one of the most evocative smells of the returning season. The buds are visible from close range as sticky, reddish-brown points on the ends of twigs. On warm afternoons, the resinous scent carries on gentle breezes along river floodplains, sometimes noticeable from 100 meters away without seeing the trees themselves. The Skagit River valley, Snoqualmie River bottomlands near Carnation, the Willamette River banks near Eugene, and any riparian zone in the Interior Valleys will be thick with cottonwood scent on sunny late-February days. Chickadees and red-breasted nuthatches forage actively in the bursting buds, and native bees collect the resin for nest construction. For herbal practitioners, this is a traditional gathering time for cottonwood buds, which are tinctured in oil to make salves used topically for muscle pain and inflammation. The phenological moment — sticky buds splitting in the first warm light of late February — is one of those quiet, intimate harbingers of spring that rewards those who walk river corridors with awareness. Combined with red alder catkins, early pussy willows, and the calls of song sparrows beginning to intensify, the cottonwood bud burst marks the unmistakable beginning of the PNW's slow biological thaw.