flowers herbs medicinal perennials pink plants red summer valerian Valeriana officinalis Valerianaceae wales wild autumn brown calm Gower green landscape moor peace rural sheep sky sunlight tranquil arch bridge forest hills historical landmark old planks rail river timber welsh wooden aerate background cascade dam fall flow rivulets stone streams texture wall water ancient Carnation countryside flower rough field heather ling marshy meadow natural nature outcrop reeds rock trees communication estuary gantry indicator ladder Mawddach railway sign Signals view clouds dusk grey heaven horizon skies South Wales storm clouds sun sunset