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Érable rouge colonnaire à automne doré-orange
Acer rubrum ‘JFS-KW78’
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Armstrong Gold® Red Maple (Acer rubrum ‘JFS-KW78’) is the cultivar ‘JFS-KW78’, patented PP25301 and introduced by J. Frank Schmidt in 2013. Developed from a freely pollinated seed of the ‘Armstrong’ maple, it was selected from hundreds of seedlings for its more compact, dense, and narrow silhouette. Its branches grow close to the trunk, forming an extremely narrow columnar to oval crown. The medium green foliage, finer than many red maples, turns golden to rich orange in autumn. Expect a height of approximately 40 feet with a width of only 12 feet. The official hardiness is zone 4.
In Quebec, plant Armstrong Gold® in full sun or partial shade in acidic to slightly acidic, fresh to moist, well-drained soil. Avoid alkaline backfills, road salt, reflected heat, and small compacted pits, which can cause chlorosis and dieback. Keep the root collar and graft union visible, then apply 2 to 3 inches of mulch without touching the trunk. Water deeply during the first two seasons and during prolonged droughts. Maintain a dominant central leader and correct any competing branches early; open angles at the base of the branches promote a strong framework despite the very upright habit.
Armstrong Gold® is suitable for narrow yards, alignments, vertical screens, and streets where lateral space is limited, but its 40 feet height requires clearance under wires. Small red female flowers appear before the leaves. The patent indicates sparse fruiting: some samaras may ripen when pollination occurs, without abundant production each year. The species Acer rubrum is native to Eastern Canada and Quebec, while ‘JFS-KW78’ is a horticultural selection created in Oregon. Fresh, wilted, or dry leaves can severely poison horses; do not install the tree in an equine pasture and prevent access to fallen branches.
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