The plants growing on a stone wall for which fall the water.
I use put a bed of java moss, and when the moss has coveres all stone surface, i put the plants.
I put a water pump which take the water in the bottom of the tank and it leave to fall on top of stones wall so the roots allways are humidified. Another imortant point is keep the tank totally close to not lost humidity.
Down this condition all aquatic plants which we keep into us tanks can be grown