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

box elder 'Elegans' · Acer negundo 'Elegans'
Grow in fertile, moist but well-drained 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.