Water hardness: 10-30 degree
Hygrophila polysperma is one of the "easiest" aquatic plants. Even in the worst possible conditions it will continue to grow. Improving the conditions is, obviously, beneficial to the plant and its growth. Under good lighting the shoots turn a reddish-brown colour. This plant grows very quickly and needs to be cut back more frequently than other stem plants. Highly recommended for new setups and as a preventive measure against algae.