1, in general, canna's massive roots are edible, containing a high content of starch, and its fresh products can be eaten as vegetables and dried products. Canna grandiflora, as a hybrid variety of canna, has no toxic and side effects, but its roots have certain pharmacological effects, and improper consumption may cause allergic or abdominal pain, so it is not recommended to eat it directly.

2. The roots and flowers of Canna grandiflora are mainly used as medicinal materials. Its medicinal properties are cold and sweet, and it is mainly used for treating excessive leucorrhea, traumatic injury, clearing heat and detoxifying, and also has a good hemostatic effect. Usually, decoction is taken orally or pounded on the wound externally, which can effectively achieve the purpose of diminishing inflammation and eliminating swelling. And because it is a medicine, it must be used under the guidance of a doctor.