Pond Boss Forums GENERAL QUESTIONS Help Does pondweed contribute to algae?

I killed off almost all the southern naiad, and more besides, last summer. Pond turned healthy green for a couple of months, nothing grew due to lack of sunlight penetration beyond about a foot. Fortunately no issues with toxic cyanobacteria, but then my place is naturally infertile.

Pondweeds have slowly come back this year, but still not at levels they were prior to treatment. Obviously it depends on your situation, in a very fertile pond you may need to exercise great caution & only kill a portion at a time to avoid trouble.