Canna lilies, or cannas, aren't actually lilies at all---they're tropical flowering perennials more closely related to banana and ginger plants. Cannas have solid or variegated green leaves with large, fragrant flowers that come in an assortment of colors. They can grow to heights of two to 10 feet, depending upon the canna lily variety, and once fully grown can quickly become a colorful focus in any garden landscape. Canna lilies can be successfully grown by transplanting existing plants from their pots directly into the garden.
In the spring, after the danger of frost has passed, dig holes to plant canna lilies. Select locations in the garden that receive full sun or partial shade and has fertile, well-drained soil. Holes should be placed one to two feet apart, depending on the maturity size of the canna lily cultivar.
Dislodge canna lily plants from their pots. Trim back foliage to two to three inches tall.
Split canna lily roots, called rhizomes, if necessary. Each rhizome contains growth points, or eyes, in various places along the root. Split rhizomes with a sharp knife or shovel so that there are at least three eyes per root section.
Plant the new canna rhizomes in garden holes, and cover with two to three inches of topsoil.
Water the canna lilies liberally.
Apply a layer of organic mulch around the canna lilies after new growth appears. This step will help the plants retain moisture and prevent weeds from growing.