Betula birch deciduous England english forest Great Britain natural nature spring sunlight Sussex trees trunks white woodland Carex pendula pendulous sedge stream water branch field grass green landscape meadow oak Quercus tree trunk beech Fagus shadow wood bucolic countryside farmland gate lane Natural landscape rural scene ancient flower garden historical lavender old plant Surrey tulip wall walled Dog's mercury Euphorbiaceae Mercurialis perennis poisonous uk united kingdom wild alone Downs one plain silhouette single south