I never could figure out why these plants are called 'cattails'. And I still don't know. They are called 'bulrushes' in England and some other places.

Interesting information about the cattail from http://www.cattails.info/ -

"Cattails are wetland plants with a unique flowering spike, flat blade like leaves that reach heights from 3 to 10 feet. They are one of the most common plants in large marshes and on the edge of ponds. Two species are most common in US: broad leaved cattail (T. latifolia) and narrow leaf cattail (T. angustifolia)."

"Cattails prefer shallow, flooded conditions and easily get established along a pond shoreline or in waters one to 1.5 feet or less in depth. When unimpeded however, the cattail beds will expand and can extend their hefty rhizomes well out into pond surface, actually floating above much deeper waters. Cattails need to have “wet feet” during most of the growing season."