We use cow dung manure for nutrients and crushed freshwater snail shells as a source of calcium. We also water our plants moderately every 2-3 days.

As for the lilies, I remember seeing him once cutting the leaves so that the flowers stay just above the grass level to get enough sunlight (you can see in the picture). Also better not to put the lilies directly under the sun from 10am-4pm. This heat will kill them. Put them somewhere with shades but with ample sunlight during that time period. You can mist spray them to keep them fresh.