When should you prune a eucalyptus tree?

Generally, trimming a eucalypt is only done to young trees to shape them. In that case, you would trim to an outward facing side shoot. Lower branches can also be removed. In older trees, pruning should only be done if necessary, and branches removed flush with the trunk. Some species can be rejuvenated completely by coppicing, or cutting right down to a stump. Only species with a lignotuber will regrow, so check first.