Invasive Species‎ > ‎

Norway Maple

NORWAY MAPLE (Acer platanoides)

Medium tree that a fast grower and is popular on urban and suburban boulevards and lawns.  It is prized for it large, dense crown and tolerance to difficult growing conditions such as poor soil, drought and pollution.  

Native Range:  Norway

Description:

  •   large deciduous with broad, rounded crown
  •   distinguished from other maples  - leaves & twigs ooze sap when cut or torn
Height:  60-70 feet (18-20 meters) high with trunk diameter 6-7 feet (2-3 m)

Stem:  smooth gray-brown bark, stout twigs

Leaves:  dark green - 6” wide and 4-5” long with 5-7 lobes (sugar maple leaves are longer than wide).  Last to change colour in the fall and turn bright yellow

Flowers:  yellowish-green in stalked clusters mid to late April as the leaves are growing

Fruit/Seed:  double samara (keys), wings diverging at 180 degrees, wind dispersed

Roots:  Shallow rooted, frequently exposed at surface


Effects of Invasion:

  •   frequent invader urban & suburban forests
  •   extreme shade tolerance allows growth beneath intact forest canopy, fast grower & prolific seed producer
  •   out-competes native trees for water/nutrients
  •   invaded forests suffer losses in diversity of wildflowers


Native Alternatives

  •   Red Maple (Acer rubrum), Sugar Maple (Acer saccharum),  American basswood (Tilia americana), Red Oak (Quercus rubra), Hackberry Celtis occidentalis)