How to Prune mountain maple?
Little pruning is needed. Remove diseased, damaged, crowded or crossing shoots and unwanted growth. If needed, Prune only from late autumn to midwinter.

mountain maple · Acer spicatum
Also known as: spike-flowered maple
Grow in fertile, moist but well-drained neutral to acid soil in sun or partial shade. See tree cultivation for further advice
Little pruning is needed. Remove diseased, damaged, crowded or crossing shoots and unwanted growth. If needed, Prune only from late autumn to midwinter.