Cannas are beautiful flowers, but they are occasionally problematic. In areas where canna bulbs can survive the winter underground, the flowers can take over. Some varieties will slowly invade the space and steal the resources of other plants in your garden. They can even spread out into the lawn. In other gardens, canna may contract diseases or pests that are not easily managed. Whatever your reasons for getting rid of your cannas, a little know-how makes removing them a quick and easy process.
Dig the canna bulbs out of the ground. Canna is a perennial that grows from an underground bulb so cutting the foliage will not get rid of them. Use a hoe to dig the entire bulb out of the ground, and they won't come back.
Search the neighboring soil with your hoe to make sure you have not missed any bulbs or bulb pieces. This is important if you are getting rid of canna bulbs that have yet to germinate this season.
Toss the canna bulbs into the compost pile. That is unless you are getting rid of your cannas because they have been infested with pests. These cannas should not be composted. Their leaves may harbor pests or unhatched eggs. Instead, tie them in a plastic bag and throw them in the garbage can.