Alnus hirsuta grows in some of the most demanding landscapes on earth: the foothills and mountain slopes of Siberia, Manchuria, Japan, and Korea, at elevations between 2,500 and 5,000 feet, beside cold streams and in boggy ground at the base of mountains. Its species name, from the Latin for coarsely hairy, hints at the textured character of its leaves, quite different from the polished surface of its European cousin. The tree grows 30 to 60 feet tall with a rounded, low-slung canopy and a 20 to 30 foot spread.

What distinguishes the Manchurian alder among its genus is drought tolerance that puts other alders to shame, an asset that broadens its landscape usefulness considerably beyond waterlogged ground. It still performs best with consistent moisture and tolerates occasional standing water without complaint, but it will not falter in periods of summer heat and dryness that would stress less resilient species. Dangling male catkins appear before the leaves in spring, the smooth gray bark is handsome in winter, and the shallow roots sucker freely to form colonising stands that stabilise eroded banks. Its root associations with soil bacteria fix nitrogen, gradually enriching poor ground. Hardy to zone 3, it is among the most cold-tolerant trees in this catalogue.