RAH, thanks for that link! I never really thought much about what type of cattail I had, I just knew I had cattails. After reading that link I actually have the invasive species or narrow leaved cattail as well as the native species. What's interesting is that the native species is in one stand that actually seems to stay in check. The narrow leaved cattails are the issue. They seem to spread rapidly and grow aggressively. They have surrounded 3/4 of one of my ponds already. Very interesting information!
I went on to read what they had to say about management of cattails. Some food for thought...
http://www.dcnr.state.pa.us/forestry/invasivetutorial/cattail_M_C.htm
