Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants lilies in containers

I have some habitat structures I've built which run down the slope of my pond bank from 18" to 8 feet deep. On top of the structure in 3 feet of water I've mounted a 55 gallon plastic drum cut in half the long way and filled with dirt. My hope is that whatever I plant in the drum won't migrate out because there is no soil outside of the drum for another 5 feet to the pond bottom. What lillies would be good and hearty in zone 5 for these containers?