Norway maple (Acer platanoides)

Third place champion Norway maple in Fort Collins

Species info:

Leaves: Opposite, simple, 5-lobed, 3–6 inches across with long 3–4 inch petioles. Color varies by cultivar — new growth may be rust to red-purple fading to green, or remain red-purple all season.

Leaflets: N/A (simple leaves)

Leaf Surface: Smooth, glossy upper surface; lighter underside.

Bark: Distinctive gray-black bark with pronounced root flare; becomes furrowed with age.

Flowers: Small, greenish-yellow, attractive clusters appearing in April before leaf-out.

Fruit: Twin samaras forming a straight line (unlike most maples, whose samaras angle at 30–90°).

Botanical: Acer platanoides

Family: Sapindaceae

Mature Height: 40 to 50 feet

Canopy Spread: 40 to 50 feet

Foliage Type: Deciduous

Tree Shape: Rounded to oval; some cultivars columnar

Growth Rate: Slow to medium, depending on cultivar

Fall Color: Usually yellow; some cultivars show orange or red tones

Water Use: Moderate; tolerates heat and drought better than most maples

Hardiness: Zones 3–7 (depending on cultivar); best below 6,500 ft

Soil Preference: Tolerates a range of soils, including heavy alkaline clay; prefers well-drained sites

Wildlife Value: Provides light shade and habitat; samaras eaten by small mammals and birds

Pests/Pathogens: Aphids common; their honeydew can promote sooty mold. Susceptible to frost cracks, root girdling, and shallow rooting that may lift sidewalks or restrict lawn growth.

Planting Recommendations: Performs well below 6,500 ft in sunny, open sites. Avoid planting near sidewalks or compacted areas; prune in late fall to minimize sap bleeding.

Information Sources:

• Michael A. Dirr. Dirr’s Encyclopedia of Trees and Shrubs. Timber Press. 2011