Propagation
Collect seeds when green and they can be sowed directly or stratify for 2 to 3 months and then place in a cold frame. Germination may take up to 2 years. 

Botanic information
Leaf: The broad ovate leaves have 3-lobes with the centre being larger with a long acuminate apex. The margins are biserrate and the reddish petiole is up to 20 mm (¾ in) long. During autumn leaves turn orange before falling.

Flower: The small cyathiform (cup-shaped) flowers have 5-reddish green tepals and have a short pedestal. They are arranged in a pendant raceme that appears with the foliage during mid-spring.

Fruit: The small greenish twin samara has wings that diverged horizontally and are partially hidden by the persistent calyx.

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.