These handsome plants may be grown in pots in the greenhouse or in flower beds out of doors in summer. The broad foliage is green, brown, or bronze, and the flowers are of many colours.
Cannas are not hardy, and need to be wintered under cover. The strong, thick rootstocks form large masses, which can be taken out of the beds in autumn with soil adhering and stored in a frost-proof place for the winter. These clumps can be divided in spring. It is usual to pot each division, and to plunge the pots in bottom heat, but they can be started in a warm frame or greenhouse. When they have begun to grow they should be hardened off in a cold frame, and planted out after mid - May.
Much the cheapest way to raise cannas is from seed, which is the size of a pea and very hard. Germination is hastened by soaking the seeds in water for 12 hours, then sowing in a warm greenhouse. The seed may be covered with half inch of soil.
When grown in pots the plant needs a rich, porous compost A mixture of three parts loam, one part leaf-mould, and two parts decayed manure, with plenty of sand, suits it. It should be well watered, and when the flower spikes push up, liberal doses of liquid manure should be applied.