Timely pruning is acer up your sleeve

My acer is starting to get very overgrown. When is the right time to prune it? Alice, South Shields

DAVID: You should prune acers between the months of November and January – during this time they are dormant and most of their energy is focused in the roots.

Pruning them during this window will prevent them from bleeding sap, and will keep your tree in the best health.