I planted a row of Thuja plicata somewhat over a year ago as a boundary hedge. It's quite shady so they have not grown much but they are surviving and growing.
They're about 3' (1m) tall but quite spindly, should I already be pruning them, if not when? There's not a lot to prune but I don't want to miss the opportunity especially as I want to keep growth as low down the trunks as possible. What is the right pruning regime for these, given I want to keep them about 8 feet high (2-3m) eventually as a dense hedge?