We finally found some cattails. They are in our local bird sanctuary, so it will be easy to follow them for a year now that we've found them. The kids really wanted to touch them but they were too far away for us to reach, as well as being on protected ground. I will have to keep my eye out for some they can feel.
Here is a picture of my sweet boy trying to climb a tree to reach the cattails.
Here are the children and my drawings of cattails. Going clockwise~ Tom Sawyer (7), Me, Little Red Riding Hood (5), and Goldilocks (8).