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Missouri Botanical Garden PlantFinder lists Cornus nuttallii for USDA zones 7 to 9 at 15-40 feet tall and 10-25 feet wide, in full sun to part shade with medium water, tolerating deer, clay soil, and black walnut.
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The Lady Bird Johnson Wildflower Center documents it as native to CA, ID, OR, and WA in the U.S. and British Columbia in Canada — a coastal western species west of the Cascades with a small disjunct population in northern Idaho.
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Missouri Botanical Garden notes it performs well in the western U.S. but does not prosper in the eastern U.S., and that stressed trees are susceptible to dogwood anthracnose, leaf spot, crown canker, root rot, and leaf/twig blight, plus borers, leaf miner, and scale.
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Plotwright Heat Tier Warm–Hot per ADR 0021 — a maritime Pacific Northwest-to-California species whose published USDA range tops out at zone 9; not adapted to the humid, hot eastern U.S. summers where anthracnose pressure rises.