I'm interested to know more. What has your experience been so far? Have you had a chance to harvest them and try them out? There is a boggy spot on the property we are buying and I'm looking for water-loving plants to try out. I was initially under the impression that this was the same plant used to make arrowroot powder, but now I know differently. Here's what I learned from my research:
-They are from the diverse order Zingiberales
-There are over 100 species of the genus
Canna
-The plant from which arrowroot powder is made is in a different genus:
Maranta arundinacea
-The starch from
C. edulis (Queensland Arrowroot) is very easy to digest.
-The rhizome clump of
C. edulis can be two feet long!
http://www.eattheweeds.com/canna-confusion/
Growing
Maranta arundinacea probably wouldn't work for us, as it's tropical.