Name the world's most problematic aquatic weed. What is the nature of the water body in which the weeds grow abundantly?

@ ananda 

the most problematic aquatic weed is WATER HYASINTH ..

its often called as terror of bengal .

REASON 

1- it will creates unbalance in the ecosystem .

2- it will block the water channel and cause the destruction of many fishes . 

so, if grown rapidly then it can destroy the ecosystem of the area ..

HOPE IT HELPS 
CHEERS

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And also these weeds grow rapidly because of offset reproductive method..
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