It is not:
A dictionary or a drink. Nor is it a tree, bush, fungus, berry, tuber, fruit, spice, tea, cassava, brassica, nettle, carrot, yam, chives, taro, arrowroot, jerusalem artichoke, spice, sugar beet or swede. It is not typically processed before eating (other than cooking or, say, slicing), and is not typically found in British supermarkets or local garden centres.