Canna Lilies are a favourite of gardeners everywhere because of their good nature and reliable show. They are also safe around pets and children since they are not poisonous at all. Cannas are fast growing plants and can reach 6 feet in good conditions.Click to see full answer. Herein, are canna lilies toxic to dogs? Canna Lily This is another low maintenance plant which is very easy to grow. They offer perennial color without potentially threatening your dog’s health. There are MANY types of lilies that are highly toxic to dogs and cause serious danger for cats, including: Peace lily.Beside above, are canna lilies poisonous to cats? Many lilies are toxic to both dogs and cats but Canna Lilies are the exception. Subsequently, one may also ask, are all canna lilies edible? An Edible Ornamental Of all the canna species, only Canna edulis has a history of use as an edible food. The species is also called Canna indica. All cannas, including the edible species, have showy, ornamental flowers and tropical foliage similar to that of banana, a close relative.Are calla lilies poisonous to humans?Calla lilies contain insoluble calcium oxalate crystals that are similar to other plants in the Araceae family. When eaten, these crystals cause pain, difficulty swallowing, temporary hoarseness and swelling. Also, if the juices of the plant come into contact with skin, pain, burning and swelling may occur.