The large leaves of the sweet chestnut are quite distinctive, being oval in shape and boldly toothed, almost ‘saw-like’ in appearance. When they first burst from their bud they are a pale green colour, which darkens with age, and then fades to a golden colour in autumn. The bark of the tree is deeply grooved, and may appear to travel up the tree in almost a spiral. The nut of the sweet chestnut is held in a green case covered in bristles. As the chestnut ripens it splits open usually revealing three nuts, although often only one of the nuts is fertlile.