Norway Maple ‘Crimson King’ · Acer platanoides ‘Crimson King’

Acer platanoides 'Crimson King' carries the architecture of Norway maple, a broad rounded crown and palmate five-lobed leaves, but with foliage that emerges deep purple in spring and holds that colour through summer rather than reverting to green. Autumn brings orange-red tones over the dark base, shorter and less variable than the butter-yellow turn of the straight species. Small yellow corymbs in early spring carry pollinator value before leaf-out.

Climate suitability inside Spain is narrower than for the straight species. The cultivar performs reliably across the humid Atlantic northwest (cornisa cantábrica), Galicia, Asturias, Cantabria, and inland Basque Country, where cool summers and steady rainfall match its preference for oceanic conditions; it remains viable in the Pyrenean foothills and irrigated northern parks. Across the Mediterranean coastal belt, the central meseta, and the semi-arid southeast, sustained summer temperatures above 32 °C scorch the dark foliage and shorten its useful life. The species performs poorly south of the 37th parallel.

Water demand is medium through establishment and at maturity; this is not a drought-tolerant tree in the Mediterranean sense, and dark pigmentation increases canopy heat load relative to green-leaved alternatives. Plan for full irrigation through the first three summers and continued supplementary watering in any zone with prolonged summer drought. Hardiness reaches roughly -34 °C, so winter cold is never the limiting factor inside Spain. The cultivar tolerates alkaline, acidic, sandy, and clay soils provided drainage is adequate, and performs best on the deep loamy soils of northern Spain.

Mature size in Iberian cultivation settles around 10 to 15 m tall and 6 to 10 m wide, smaller than the 20 to 30 m reached in its native northern European range. The root system runs shallow and can lift paving in confined urban pits, so reserve the cultivar for park settings, wide verges, or generous tree pits with engineered substrate. The species is susceptible to verticillium wilt, a soil-borne disease worth checking against site history before specification. Best deployed as a focal specimen against lighter foliage rather than as a uniform avenue planting.