For those that would like to try something different.

Cattail Flour

Dry the peeled roots (peel roots while they are wet–they are
difficult to peel if allowed to dry). Chop roots into small pieces,
and then grind or pulverize them. When the long fibers are removed,
the resultant powder can be used as flour.

An old recipe from Grandma Walters Cook Book. Pretty tasty too.