In a Miami study, large African marigold plants proved the best at extracting phosphorus and nitrogen from canals
Ornamental flowering plants are more than attractive, they can also help to clean up water pollution. Fertilisers and manure on farms are loaded with phosphorus, nitrogen and other nutrients that get washed away by rain and flushed into waterways. Algae can then feed on the nutrients and grow so rapidly that they starve the water of oxygen, killing off fish and contaminating entire ecosystems.
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