Even a well laid hedge will need to be trimmed withing 5 years and routinely thereon, if that is how it will be managed. However landowners/farmers have been encouraged to flail only one side of any hedge, once every two years. This allows production of seed/food. I have taken pride in my hedgelaying skills I am on several County Councils approved contractors list. However, more and more hedgelayers are relying on their chainsaw to make fast/light work of a poorly paid craft. Where with a billhook, the blade will crosscut cleanly and if cut at a angle, the water will flow off the stump and no organic build up will occur, that can encourage rot, a chainsaw can leave a cruder finish. For years working as a hedgelayer, I have hated the tractor flail method. I now fully understand the necessity on economic grounds.