Water Sensitivity Plant. (Neptunia oleracea) This plant, when touched, is shy and will close it's leaves similar to the mimosa plant. It has a wonderful flotation system of bulbous material it uses to spread across the water. In addition to all this excitement it produces a bright yellow feathery flower that holds high above its sensitive leaves and reflects a beauty into the water. Add this most unusual aquatic plant to your water garden pool and all will be amazed when touched!