Underwater plants are very important to the pond ecology. They contribute to clear water as well as anything else you might put into your water garden, sometimes referred to as nature’s filtration system. To be the most effective, they should be stocked at the rate of one bunch per two square feet of pond surface area or one bunch for every 20 gallons of water.
Besides helping water quality, these plants provide cover and protection for adult fish and baby fish. Goldfish will spawn in May and June on these plants, attaching their eggs to the foliage where they soon hatch. Fish fry (babies) will be protected by hiding in the submerged plants from adult fish until they can grow larger. Stock early to be able to get all benefits of these important plants. Stems are held together by a rubber band. Plant this end in gravel to weight it down. Floating the plant is not nearly as effective.In shallower areas of the pond, they provide needed shade for algae management. In the depths of the pond they’ll take nutrients from the water through their foliage.