ash background bark Fraxinus rough texture tree branch bud burst England fresh life New spring Sussex branches bright brilliant green leaf leaves summer sunlight sunshine charcoal chopped cleared cut felled log production Stump timber trunk woodland cracked crevice fissured hard natural nature protection protective english Great Britain crack durable fissure lichen pattern strong bank flood meadow landscape reflection river rural scene Stour Suffolk trees water fence fields footpath path South Downs track trail Trek