agriculture background bio blue brassica canola cloud clouds colza forest green harvest nature oil rapefield rapeseed sky turnip wallpaper blade blades crop five gray mills rocks rotor stones windmills bioenergy crops energy fields flowers sundland yellow farming landscape sweden windmill Brassica oleracea var. gongylodes cabbage turnip garden gardening German turnip healthy food home-grown kohlrabi organic organic food plant vegetable country field HDR lane lines napus Nyberg power rape road rural scenery seed side spring street summer tree Brassica napus England english farm Great Britain national park plants seedheads South Downs Sussex bright countryside Hampshire hedge oilseed verge bank Cardamine cuckoo flower hedgerow natural peace brassica oleracea cabbage cultivar cut drops gongylodes group healthy leaves nutritious purple sprinkled stalks stems trimmed water wet winter vegetable