The tall arching green plant Acorus calamus ‘Argenteostriatus’, also referred to as sweet rush or sweet flag, thrives in moist or boggy soils, making it a sensible choice for your shallows of the pond edge. Ponds may also call for electric powered or photo voltaic powered pumps, to circulate h2o. https://www.amazon.com.au/gp/product/B0D5BZZZ7K