i have a temp half filled npt on my porch used to grow tadpoles and salamander larvae, now it has one larva in it and lots of snails, the plants i have in it all came from a vernal pool and shallow area of a lake in upstate ny. they include arrow arum (which grows huge but apparently only in deep enough soil), narrowleaf arrowhead, duck weed, and some other plant which i cant identify but has shot up stems with bunches of white flowers. the arrowhead started as bulbs from a single plant i had in a pot that i thought died overwinter but surprised me. they spread like wildfire. all of these plants grow out of the water and havnt rotted from being emersed.