Because alligator weed can look different depending on where it grows, use these key features to identify it: North WestRegional Best Practice Guide for: Alligator Weed

Alligator weed ( Alternanthera philoxeroides ) is an aggressive, invasive perennial from South America often described as one of the "world's worst weeds". It thrives in both aquatic and terrestrial environments, forming thick, dense mats that can double in biomass in just 50 days.

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