artichoke artichoke blossom blossom botanic cook cooking field flower food fruit gardening globe artichoke leaf leaves nature plant summer vegetable vegetables ripe flowers globe plants appearance bracts budding cluster cultivar cultivated cynara-cardunculus distinctive edible-plant edible-portions flower-buds flower-head French-artichoke fresh globe-artichoke green-artichoke inflorescence petals produce raw shape surface surfaces tender-heart texture textured textures thick thin thistle-species tips tough-exterior uncooked unusual varieties