Thanks steiconi.

See if your wild birds like it. Apparently chickens and ducks do, if you had some as pets.

koi love it.

I'd be willing to take some of that off your hands!

Yes you can because the good advantages reverse at night. So your pond can run out of oxygen at night in theory.

From my understanding Duckweed would decrease oxygen. Plant roots naturally take in O2. They also decrease the amount of water exposed to the surface. They are great nutrient filters though. Their roots get covered in micro organisms that can be fed off of by smaller fish.

Hello @catherinet. Nice to see some familiar faces here, been away for a few yrs. Late to the party so guessin you've got your answer already....yes, there is such a thing as too much of a good thing. Duckweed is either a blessing or a curse depending - I personally love it. Hey, the eye of the beholder and all that;) But absolutely, if it covers the entire surface for an extended period it will deplete oxygen levels to the detriment of your pond. I'm no frog expert but I expect they're leaving out of sheer survival instincts.

For some reason, I had it in my head you also kept fish in one of your ponds. Either I got you confused with someone else or I'm just getting old, lol. (hope it's the former :p ) I struggle to keep duckweed here. My puddle is three small ponds connected by water falls - who am I kiddin, more like cascades *snort*. Anyhoo, the upper pond is labeled the settling pond, it's first in line after the skippy filter. The middle pond is the fish pond and the lower is the frog pond. I keep duckweed confined to the upper/settling pond. Some does escape to the 'fish pond' when it gets prolific but mostly, I frequently dip it out and toss it in the fish pond as a treat for my goldies where it disappears in mere seconds.

That to say, fish will keep it in check (if you could keep it at all with fish) but yeah, sans fish you'll need to remove some often to keep your pond healthy. If it's worth the trouble to you, you could sell excess and more than support your pond maintenance and any new plants you might care to add. Hilarious to me in our neck of the woods but duckweed is expensive to buy online. Whodathunk? I keep a small reservoir on the side just for duckweed because my fishies make it do a disappearing act and I do love it.

Happy ponding and again, good to see you!

~digger

I need some. Mail some to me