allium ball-shaped black black-seeds brittle brown colors colours dried-up dry flowering onion-seed-head-ball onion-seeds onions seed-head seeds straw-colored straw-coloured vegetable vegetable-garden closeup grow grows head heads macro milky nature parachute plant plants sap seed spread taproot white wind Dandelion countryside flower green foliage growing seedhead England goatsbeard Hampshire Tragopogon wild autumn corn fall field garden poppy summer