Lilies (Lilium) is a genus of flowering plants grown from bulbs. Found in the northern hemisphere, lilies are found in a wide range of colors and flower styles. Many lily species are quite fragrant, making them a popular garden plant. Lilies can be toxic to cats, so grow them with care if you have cats as pets. In Asian countries, lily bulbs are eaten as a delicacy. They make a starchy vegetable similar to other root crops.