Mr. Willy,

In case I misunderstood your statement regarding "Weed Seeds" I wouldn't think aquatic weeds seeds would wash in from a terrestrial field.

I believe your lower water levels last year allowed weed growth to take off due to a higher concentration of fertility due to less water, and sunlight reaching farther down due to less water depth. You may also be getting more nutrients this spring from all the wash in, but not "weed seeds."

I believe most aquatic weeds make their way in via birds and adding water with fish that has aquatic "seeds" or fragments from other ponds. However algae is everywhere.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.