I grow mine in a large kiddie pool in full sun. I scoop out about 1/3 with a net every 3 days or so. At that feeding rate, it replenishes itself as fast as I feed it. (I fertilize it with humonia several times a week.) I'm guessing I feed 6 to 10 pounds of duckweed to my tilapia weekly. An added benefit is that the tree frogs love to lay eggs in the kiddie pool and the tilapia will DEMOLISH a netfull of pollywogs!

I've lost a large percentage of the duckweed crop this week due to heavy rains and my failing to drain the surplus water from the kiddie pool. Overflow washed away most of the crop, but it'll rapidly replenish.