Drowning weeds

Good morning
I’ve heard that drowning weeds such as nettles, bind weed and that sticky stuff will make it safe to compost. Is that correct and if so, could you tell me how long I must drown them?
Thank you in advance!

 

Ha! Thank you. We have one of those!

 

I do that with lesser celandine and Allium triquetrum. Into a bag into a water butt, make sure bag is full of water; might need to weigh it down. Make sure water container is away from house and neighbours as it will pong. I leave it three months; at which point the contents should be a sludge, then onto compost.
Shredding doesn't work with lesser celandine or Allium triquetrum as they can spread from small tubers and bulbils respectively.

 

Fabulous. Thank you.

 

I like the sound of this idea… at the moment I’m literally trying to separate the soil from the celandine tubers so as not to lose too much soil. I guess I can just top the whole lot into the water for a couple of months?