Oxygenating Plants Help Keep Water In Ponds Aerated & Pond Life Healthy. Planting Depths For Pond Plants Are Grouped Depending On Whether The Plants Need Reliably Moist, Boggy Soil Or Deeper Water To Grow In. ceratophyllum Demersumcommonly Called Hornwort This Is A Dense, Mat Forming Plant With Insignificant Flowers. flowers july height 5cm/2in. spread 1m/39in fontinalis Antipyretica this Fresh Green Oxygenating Pond Plant, Also Known As The Common Water Moss, Adds Oxygen To Your Pond Which Helps To Keep Pondwater Clear & Healthy, & Contributes To A Lovely-looking Pond. myriophyllum Spicatumthis Hard-working Aquatic Remains Underwater Releasing All-important Oxygen For Pondlife. It Can Grow In Water 3m (10ft) Deep But Is Best Established In Shallower Water & Allowed To Acclimatise Gradually. Drop In Your Pond As A Weighted Bunch Or Plant In Soil In Aquatic Pots.height 15cm/6in.