A vegetable is the edible portion of a plant. Vegetables are usually grouped according to the portion of the plant that is eaten such as leaves, stem, roots...
A vegetable is the edible portion of a plant . Vegetables are usually grouped according to the portion of the plant that is eaten such as leaves ( lettuce), stem  (celery), roots (carrot), tubers (potato), bulbs (onion) and flowers (broccoli)...