Countryside hedgerows are often more diverse, bigger and wilder than their neatly cut urban counterparts. Most consist of trees, shrubs or grasses, or a mix thereof, but they vary a lot in shape and composition across and within countries. In the UK, for instance, where hedgelaying – the art of maintaining hedges – is its own specialised craft, the National Hedgelaying Society recognises more than 30 styles of traditional hedge. These range from the tall "bullock" hedges fortified with hazel that enclose cattle pastures in the Midlands to short, thick ones in Wales that keep lambs fenced in.