These are, for the most part, submerged plants. They are very useful in supplying cover for aquatic insects and lavae and because they are fast growing will take up alot of nutrients from the water, thereby reducing algal growth.
They produce oxygen during daylight hours but as they take oxygen out of the water at night they should not be planted too densely.
Some oxygenators are not advised for large earth ponds as they can become invasive.
Callitriche autumnalis "Crystalwort, hermaphroditica" Native
Ceratophyllum demersum Hornwort Native
Eleocharis acicularis "Dwarf hairgrass, Needle spikerush" Native
Elodea canadensis "Anacharis, Canadian pondweed"
Fontinalis antipyretica Willow moss Native
Hippuris vulgaris Mare's tail Native
Hottonia palustris Water violet Native
Hydrocotyle nova zealand Miniature Pennywort
Marsilea quadrifolia Water clover
Myriophyllum brasiliensis 'Red Stem' Red stem parrots feather
Myriophyllum spicatum Spiked water milfoil
Pilularia globulifera Pepper grass
Potamogetum crispus Curly pond weed Native
Ranunculus aquatilis Water crowsfoot Native
Scirpus cernuus Fibre optic plant