The hedges of Treflach are rich in hazel. Formally of great economic importance, if cut every 7 years or coppiced the abundant growth supplied many trades. However today with modern developments (in fencing, roofing, horticulture and fuel) they have become mostly redundant but are useful to wildlife with both leaves and highly nutritious nuts.
I planted what I thought was an elm sapling a few years ago as they are so rare but identical to hazel when young only to find lambs tails on the twigs this spring and now nuts. There are a few 30 ft high specimens locally which look splendid when not in leaf and fully decked in catkins.
Most hazelnuts are now imported into the UK and in Treflach predation of the crop has been mostly by squirrels but with the sighting of pine martins locally that may change soon. They used to be a local staple, with hazel rods used to be used to divine underground water so needed locally with only one major brook running through the area that dries up in droughts.