I tried a mini-lotus this year along with two compact tropical water lilies. The tropical water lilies are doing great; the hotter it gets here the more leaves they make.
The lotus however is barely putzing along. It has a total of six small (quarter sized) leaves and none of them are airborne. What gives? It is planted in a 1/2 whiskey barrel (plastic), 8" of water on top of it, heavy topsoil ...