(Acer platanoides)1. Leaf & Keys
Deciduous broadleaf. Leaves are opposite and simple.
They have 5 lobes. Lobes and edges have scattered, blunt-shaped teeth. There are 5 or 7 main veins that spread from base of leaf. Upper surface is dark green. Underside of leaf is a paler green and hairless. Leaves are dark green in summer and bright yellow in autumn. Leaves are 4-7 inches wide. Milky sap secretes from the broken leaf-stalk.Similar to Sugar Maple. Flowers:
- Flowers are 8 mm wide and have 5 greenish-yellow petals.
- They grow in upright or spreading clusters.
- Usually male and female flowers are on separate trees.
- They bloom in early spring before the leaves.
Fruit is 4-5 cm long. Light brown. Pairs of keys have long wings and flattened bodies. Wings are spread widely, almost parallel. Maturing in late summer/early autumn. Twigs:
- Coloured like the buds.
Smooth. Young trees are light brown or gray. They become dark gray and roughly cracked when older. Height:
- 18 metres.
- 0.6 metres.
Species Requirements Distribution Range:
Zone: 3 to 7. Habitat:
- Native across Europe.
- Introduced to North America where it is considered a common, invasive species.
- Planted along city streets and in parks.
- It frequently escapes from cultivation to grow in disturbed woods and roadways.
- Found in humid temperate regions.
Tolerance to Salt:
- Norway maples grow in full sun or light shade.
High Tolerance. Preferred Soil:
Grows in almost any well-drained soil. Can grow in sandy, loam, or clay soil. pH Range: 3.7 to 7.0.
- Tolerant of many soils, easy to transplant.
Care Common Diseases:
- Basal canker.
- Bleeding canker.
- Leaf spot.
- Eutypella canker.
- Phomopsis blight.
- Ganoderma rot.
- Verticillium wilt.
- Leaf scorch.
- Yellow leafhoppers.
- Leaf stalk borer.
- Norway maple aphid.
- No serious insect problems; however, susceptible to Verticillium wilt, anthracnose, and some leaf scorch.
- Verticillium wilt can be a problem, especially in sites with compacted soil.
- Trunks of young trees frequently suffer sunscald injury.
- Norway Maple casts dense shade and it is difficult to grow turf underneath low branching specimens.
Many mammals and birds eat the seeds.
- A good specimen to plant in a variety of locations; nice shade and street tree.
- Adapted to urban conditions; tolerant of city pollution and salt.
- Transplants easily.
- Tolerates hot, dry conditions better than Sugar Maple.
- They need to be regularly pruned and branches should be thinned out.
- Best time for pruning is between May-July, and between November-December.
- Avoid pruning in late winter/early spring due to sap flow (more cosmetic than detrimental).
- Avoid pruning from spring through summer due to insect or disease problems.
- This will reduce the density of growth, otherwise the tree will provide too much shade and compete with grass.
- Requires little or no maintenance.
- Because of this tree's dense foliage and shallow root system, mulching around the base of the tree is suggested since it is hard to get anything to grow under it.
Cultivars: Crimson King Maple
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