Crab apples. They don't taste good off the tree, but they can be made into an applesauce that can be sweetened to your taste.

Bill Skinner wrote on Aug 5^th, 2017 at 11:36am:

Sounds like a new weight loss method.

My ponds have duckweed.  Usually, it's just a few sprinkles here and there.  However, if they get fertilized, they explode and will cover the entire surface of the pond, sometimes up to an inch (25mm) thick.  They are free drifting, sometimes the wind will pile them up thicker.  That's when they are easiest to harvest, you can get a lot without much work.  And it will take a lot when you boil them that hot for a meal.

My neighbor fertilized his hayfield this spring, he used commercial fertilizer.  Then we got 30+ inches (about 1m)of rain in about three months and we got some of the run off in one of my ponds. 

When his hay field was a pasture, we got a massive out break every wet year or every time following a hurricane.

Ok, I assumed as much. Ive never been a huge fan of cow manure. Just not my thing. I'm not prejudice, but I have my limits.