Add bold color and drama to flower beds or containers with canna lilies. These easy-care tropical bulbs are prized for their super-sized leaves in bright green, bronze, black, or variegated. Plus, cannas shoot up showy stalks of yellow, red, salmon, orange, pink, or bi-colored blooms in mid to late summer that attract butterflies and hummingbirds. Cannas are sun-loving tropical plants that thrive in hot, humid conditions. They have few insect or disease problems and are available in standard forms that can grow 5 feet tall and dwarfs that grow just 2 feet tall. In colder regions, cannas need to be dug up and stored over the winter.