Vallisneria and Sagittaria are two of the plants that give off more oxygen than most. Vallisneria leaves have a stripe down the centre diving them into three nearly equal stripes of two shades of green. Both plants are normally found in three types, straight, twisted and giant. Anacharis, propagated from cuttings and found in several varieties, especially Elodea, is another strong oxygenator.
Other plants propagated from cuttings are ludwigia and hygrophila. Ludwigia, some species of which have leaves that are tinged with red in the summer and autumn. While hygrophila is similar to the former but comparatively rare and of a very light and pleasant shade of green.
There are also bushy plants, such as myriophyllum, ambulia and cabomba.
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