Steve/Joel
We currently grow it in a small 250 litre plastic tub.
At the moment, we've de-stocked pending some earthworks in our back yard so we are only feeding the duckweed to our worms.
Many birds and animals will resist eating anything new once they've become used to proprietary pellets so it's best to feed duckweed or other fodder to them from their earliest days.
You won't have any problem with fish, however. We've got a small aquarium in the house and the fish make short work of any duckweed that we put in the tank.
Every week or so, we remove most of the weed from the top of the water. About a week later, it has covered the top of the tub again.
I'll probably kill off our existing plants because, as I indicated earlier, I want the short-rooted variety.
Once we crank up our own Aquaponics set up, we'll incorporate a duckweed pond into the system.
You can buy it from any aquarium shop and all you do is spread it on top of the water in any container large enough not to get too hot in the sun. Our current tub is in semi-shade.
On a number of occasions, I've almost killed it off (which is actually quite hard to do) and I've bred it back up from half a dozen tiny plants to many thousands in just a couple of weeks.
It's worthwhile putting a few plants in a shallow dish under some light and watching it multiply. It really is a fascinating plant.
Good Luck!
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