blue bluebells England english exercise flowers footpath Great Britain Hyacinthoides non-scripta natural nature path spring Sussex track trail trees Trek walk woodland autumn bank branch color colour fall forest leaves trunk hedgerow lane pink red campion road roadside Silene dioica umbellifers verge white wild cornwall countryside farm fast flowing hillside Natural landscape Riparian zone rocks stream water water resources watercourse waterway background coast colors colours Cornish eroded erosion pebbles pool smooth stones texture underwater worn bushes Calluna flora Frensham Common heath heather heathland landscape ling purple summer Surrey plants fence field green herb marjoram national park oregano Origanum vulgare post South Downs cloud crop Ears grain harvest hill quality rural Triticum view wheat