Upper branches of Platanus x acerifolia Exclamation!™ with upright form.

Platanus x acerifolia Exclamation!™ (London Plane Tree)

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Platanus x acerifolia Exclamation!™ is a cultivar of the hybrid London plane tree, which was originally created a hybrid of the native American sycamore, Platanus occidentalis, and the non-native Oriental plane tree, Platanus orientalis. The Exclamation!™ cultivar from Morton Aboretum is named for its highly upright appearance, standing out like an exclamation point in the winter landscape, and is also noted for its strong resistance of frost cracking as well as anthracnose, a common fungal disease of many broadleaf trees.

Platanus x acerifolia is a large, fast-growing tree that can reach 55' to 65' tall, with a canopy up to 40' wide. As a hybrid of American sycamore, one of the easiest ways to identify London plane is by its large, palmate leaves that look sort of similar to very large maple leaves. In addition, older bark becomes mottled and flakes off easily, revealing shades of white, yellow, and green underneath the gray bark exterior; the inclusion of yellow shades is one of the key identifiers that sets this tree apart from a straight sycamore species. Trees tolerate a wide range of soil and environmental conditions, and leaves turn a brilliant shade of golden yellow in the fall, before dropping to reveal the mottled bark, which both add further interest.

Blooming in the spring, Platanus x acerifolia Exclamation!™ ball-shaped flowers are medium sized, but inconspicuous, and pollinated flowers turn to fluffy seed balls which may persist through the winter. The tree's large size and seed balls attract all sorts of wildlife, with pollinators seeking out the inconspicuous flowers, butterflies and moths seeking out the tree for shelter, and small birds, like goldfinches, juncos, and chickadees, as well as small mammals like squirrels, beavers, and muskrats seeking out the seeds for food.

Mature Tree Height: Large: over 30 feet
Deciduous
Sun (6+ hours)
Soil Moisture: Medium and Well-drained
Soil Type: Wide Tolerance
Bloom Time: Spring
Flower Color: Green and Red
Foliage Color: Green
Features: Attracts Birds, Attracts Wildlife, Attracts Butterflies, Attracts Pollinators, Host Plant for Butterflies or Moths, Keystone Plant, Fall Color, and Winter Interest
Tolerances: Clay Soil Tolerant, Salt Tolerant, Drought Tolerant, Wet Soil Tolerant, and Flood Tolerant
Garden Type: Meadow, Specimen Tree, and Shade Tree

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