A very fast-growing stem plant that prefers cooler water and soaks up nutrients, which helps against algae.
Check your local laws. New Zealand: on the National Pest Plant Accord (unwanted organism, banned from sale, propagation and distribution). Not on the EU Union list (Elodea nuttallii is listed, not E. densa) and not on the US Federal Noxious Weed list. Present in Florida but not considered a problem species there. Never throw it into ponds, rivers or drains.
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Animals that leave it alone
