Acer pseudoplatanus 'Leopoldii' (Leopold Sycamore Maple)


Michael's Opinion

A European cultivar that is seldom used in Ontario for what reason I am not sure. A. pseudoplatanus can reach a height of 20 m and is a broad, dense canopied tree. Since it occurs in lean, often poor soils it can be used in similar situations on the landscape. A wonderful tree where room permits such as parks and institutional settings. Best planted where the full form of the tree can be appreciated. This cultivar is supposed to have pink in the leaves, I have never seen this and in fact believe that the cultivar Leopoldii could be confused with 'Variegatum'.

Botanical Information

FamilySapindaceae (Aceraceae)
GenusAcer
Speciespseudoplatanus
Cultivar'Leopoldii'
CategoryWoody
TypeTree (deciduous)

Details

USDA Hardiness Zone5
USDA Hardiness Ref.
Canadian Hardiness Zone4 - 6a
Canada Hardiness Ref.
RHS Hardiness ZoneH7
RHS Hardiness Ref.
Temperature (°C)-29 - (-23)
Temperature (°F)-20 - (-10)
Height20 m
Spread12 m
GrowthFast
Flowering PeriodMay

Description and Growing Information

General DescriptionA large tree with a somewhat rounded canopy, casting a dark shade.
ID CharacteristicIt can easily be distinguished from most maples in Ontario because of its deeply set venation and its extremely long petiole (10cm or greater). The leaves are randomly splotched with a dark cream colour resembling paint splatters.
ShapeLarge rounded crown.
LandscapeParks, Institutional Landscapes and Estates where room is not an issue. A. pseudoplatanus 'Leopoldii' is somewhat salt tolerant and hence it may find limited use as a street tree, especially within developments that have private roads but sufficient space for the tree to develop.
PropagationMust be budded onto A. pseudoplatanus rootstock.
CultivationEasy to grow, tolerant of lean soils and winter salt.
PestsIt suffers from aphid infestations and the associated sooty mold.
Notable SpecimensOld Specimen area, Niagara Parks Botanical Gardens, Niagara Falls, Ontario, Canada.
HabitatHorticultural origin.
Bark/Stem DescriptionOrangish inner bark, covered with irregular exfoliating scales that are light grey in colour.
Flower/Leaf Bud DescriptionTerminal buds are prominent remaining green throughout the winter. Similar in size and form to A. plantanoides.
Leaf DescriptionDeeply veined, opposite, 3-5 lobed, dark green above and light grey green below. Deeply veined with an extremely long petiole.
Flower DescriptionYellowish green flowers on upright panicles to 15 cm.
Fruit DescriptionSamara, ripen in early autumn and are about 5 cm long.
Colour DescriptionDark green in the summer, silver undersides to the leaves and turning a dull mucky brown in the autumn. The dark green upper colour is overridden with a dark cream colour which resembles paint splatters.
Texture DescriptionRough textured leaves because of the deep venation however they are smooth on the upper surface.

Photographs