| Water Hyacinth along with Water Lettuce are very good absorbers of nitrates and are used most effectively in plant filter application where water flows past their roots rather rapidly. Adding these floating plants to a Koi pond will usually result in dead plants as Koi love to root around in the roots and will strip the roots bare in short order killing the plant.
These plants originated in Brazil and are banned here in Florida because of their rapid growth in sub-tropical climates. They have taken over some freshwater waterways here and are costing the state millions of dollars to control. I believe your climate is similar, so you may want to check with your authorities about importing this plant.
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Werner
Pond-On (tm)
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