There are hundreds of varieties of Canna. Some are grown from seed, others from rhizome or bulbs. They have a tropical look and are grown as much, if not more, for their beautiful foliage rather than the flowers. The Canna species have large leaves, some green, dark red, teal and even variegated with yellow and orange. They are strong plants, that like rich, well draining soil and lots of sun. If you are looking for some bold color to add to garden mid-summer, then one or more of the Canna plants are for you.
Keep Canna plants in full sun to partial afternoon shade. If your plants are in containers, you may have to move them around as the sun changes position. In the ground, make sure nothing larger is planted too close that will block their sun as it matures.
Water the plants to keep the soil moist. Some Cannas like to be wetter than others. Read the directions on the plant you purchased or watch the plant carefully. If the foliage starts to curl up, it needs more water.
Fertilize with a liquid fertilizer for tropical plants once a month from the signs of first growth, through the beginning of August. Follow the manufacturer's directions on how much fertilizer to use.
Cut flowers anytime for use in vases or flower arrangements. Cutting the flower will not damage the plant, but do not cut the foliage until after it has yellowed and withered. Up until this point it is gathering sunlight and nutrition for next years growth.
Mulch over the rhizomes or bulbs heavily to keep them warmer through the winter in zones 7 and 8. Colder zones should dig up the rhizomes, wash them off and place them in some fresh peat moss in a container. Keep them in a frost free place until replanting the following spring. You can divide the rhizomes into more plants just before replanting.