Propagation
Sow seeds when ripe in situ or in a container and place in an open frame. Germination will occur during spring, prick out and pot up and place outside to harden off.

Botanic information
Leaf: The broad dark green palmate leaves are up to 180mm (7in) wide with a sightly cordate base and ovate pointed lobes. The margin is irregularly serrated and the petiole is up to 125mm (5in) long.

Flower: The unisexual crateriform flowers have 5-sepals and 5-petals with 4-10 stamens and are arranged in  in an upright corymb-like panicle that appears with new foliage during spring. 

Fruit: The green samara are in pairs and joined at the base with membranous reddish wings that are overlapping or at right angles. They appear in a weeping cluster on the end of branches during autumn. 

General information on pruning Acer species 
The Maples normally do not require regular pruning apart from damaged, diseased or dead wood removal and this should be carried out from autumn to winter. 

Pruning in late winter or spring may result in bleeding of the sap and should be avoided. Remove reverted branches in variegated trees and clean up split bark with a sharp knife and allow natural healing.