I'd be very leery of water hyacinth, Freg. Beautiful, but spreads fast in fertile environment. Honestly don't think a hula hoop will keep it contained for long. My favorite 12 acre tank in southern Texas got 90 percent covered with hyacinth and they had a dickens of a time getting rid of it.

That said, it's your place and your choice. Just be prepared to take quick action when & if it gets out of hand.

7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160