Cannas Cannas are quick growing, vigorous ornamental plants with heavy foliage and large flowers. Donald E. Janssen, Extension Horticulture Ass't. Flower colors range from dark red to light green.
Leaf colors can be reddish-purple, bronze or green.
They are used most effectively for bedding plants in public parks and larger home grounds where they can be planted in front of taller shrubbery and viewed from a distance. Their vigor and size make them less desirable for planting in restricted areas. Cannas require a warm, sunny location and under such conditions are capable of giving a subtropical effect if used in quantity with ricinus or castor bean, caladium or elephant's ear, or other appropriate plants. They thrive best under conditions suitable for corn, that is, a warm, well drained soil, well enriched with decayed manure. The tubers should be planted after all danger of frost is past.