Water canna (Canna glauca ) an aquatic plant, native to South America and regions of Florida, it is treasured for its blue-green foliage and ability to grow in shallow water. The plants grow 4 to 6 feet in height. Yellow flowers are produced on long spears from early early spring through summer. Water canna is an ideal plant for growth in and around ponds or creeks. The plants also flourish in water-logged regions of the garden where other plants will perish.
Grow water canna in tropical and sub-tropical regions. If grown in regions that suffer cold winters, dig up the rhizomes and replant in the spring. The water canna flourishes in the southern United States, including Texas and in parts of California.
Planting the Crown
The crown of the plant must be submerged in water or waterlogged conditions. Place the plants crown no deeper then 10 to 12 inches under the water for optimum growth. When grown in soil conditions, make sure that the soil remains waterlogged and soggy. Periods of dry soil or drought will quickly kill the water canna.
Species and Hybrids
The true water canna produces a flower that resembles a yellow daffodil, but several species and hybrids are currently available. The blossom colors range from peach to a brilliant red in appearance. Several varieties offer more cold hardiness but all must be lifted in extreme winter.
Water canna requires full sunlight for ideal growth. The plants needs to receive four to six hours of sunlight per day to produce abundant blossoms.
Dig up the plants' rhizomes and store in peat moss. Keep the rhizomes in a cool, dark place during the cold months of winter. The temperature should be above 65 degrees F and below 70 degrees F. for ideal storage. The plant can also be dug up and placed in a sunlight south facing window, but success is limited and difficult. The plant must be kept waterlogged in a warm area to maintain throughout the winter or it will easily perish. Indoor humidity can also pose a problem when wintering the water canna plant.
Insects and Disease
If the water canna becomes infected with rust, cut the plant off at the crown and discard the infected foliage. The plant will return healthy. Aphids often pose a problem for water canna but can easily be controlled by simply washing them away every few days.