flowers of chestnut male and female

agriculture alternative botanical botany brown bur burr castagna castanea catkins chestnut chestnuts closeup crenata cultivar fagaceae female flowers garden gardening genus green hedgehog herbal homeopathy husk kernel leaf leaves lower macro male medicinal medicine natural nature nut pharmacognosy phytomedicine phytotherapy plant sativa season sexed spiky splinter sweet tasty thorns thorny tree upper urchin