We came across a story that suggested if cattails are cut below the water in summer and then recut several times it will starve the roots. I've cut a bunch, over multiple weekends and it seems to be working but wondering if it works over years not just in that summer. The article noted cutting in spring promotes growth but later in the year the roots get nutrition from the fronds so cutting them cuts off nutrition.

Has anyone else done this? What is the longterm success?