I have a beech hedge which is 3 years old and I'm wondering if I can trim it now in order to make it look more uniform? If so, how would I go about it? Just take the tops off? Please excuse my lack of expertise.
Its normal to trim Beech in August so that it keeps its leaves in winter, but it would do no harm to cut that down by half. Each spindly main shoot could come down by two feet. That would encourage it to bush and ultimately make a better hedge. A good watering , then a mulch mixed with some feed such as growmore or blood , fish and bone will help it grow well during the summer. Do not feed later in the season or you get weak sappy growth which gets damaged by frosts.
give it a trim with a pair of secateurs not a hedge cutter, take it back to a leaf or a joint in the branch and then feed it, I would also mulch underneath it as they don't like dry roots, something like woodchips will be fine