Propagation
Stratify seeds for 1 to 2 months during winter in peat and sow seeds in pots then place them in a cold frame. Seeds may be pre soaked for 24 hours prior to stratification.

Botanic information
Leaf: The bright green leaves are broad ovate with 5-tapering lobes. The petiole is long and the leaf base is hastate. During autumn the leaves turns yellow befor falling and the reddish brown buds are imbricate and 4-sided growing to 6mm (¼in) tall.

Flower: The tree is monecious and the male and female flowers may not open at the same time. The tiny greenish yellow flowers have five-pointed calyx with a pedicle up to 12mm (½in) long. They are arranged in an upright terminal corymb that is up to 75mm (3in) wide and appear during early spring. 

Fruit: The fruit is a twin samara that is joined at the base and arranged at a 90º angle with obovate reddish wings. The ovoid seed is compressed.

Note
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 for natural healing.