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Canna Virus
  The Canna genus is susceptible to certain plant viruses, which may result in spotted or streaked leaves, in a mild form, but can finally result in stunted growth and twisted and distorted blooms and foliage. Known species of virus are:

Canna yellow mottle
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Sexual propagation
 
Canna fruit (green) and ripe seed pods
Seeds are produced from sexual reproduction, involving the transfer of pollen from the stamen of the pollen parent onto the stigma of the seed parent. In the case of Canna, the same plant can usually play the roles of both pollen
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Pests
Cannas are largely free of pests but in the USA plants sometimes fall victim to the Canna Leaf Roller and the resultant leaf damage can be most distressing to a keen gardener.
Slugs and snails are fond of Cannas and can leave large holes in the leaves, preferring the tender young leaves
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Canna Lilies and their uses
Detail of the seed pods and seeds. The seeds are used for jewelry and musical instruments.
The plant yields a fibre - from the stem - it is used as a jute substitute.
A fibre obtained from the leaves is used for making paper. The leaves are harvested in late summer
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Cannas Origins & History

The genus is native to tropical and subtropical regions of the New World, from the southern United States (southern South Carolina west to southern Texas) and south to northern Argentina.
 

Although all cannas are native to the New World, they have
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