Couch grass & Dock

Put the roots in black sacks and leave in the corner for a couple of years . Will rot down to a great compost . As for the docks i would burn them.

If you saw the couch grass roots I fished out of my 2 year old compost you'd never let another near your compost bin.

Anything above the ground I now compost, anything below burn. Composting just isn't worth the risk. A physical barrier will stop the root from wandering in, I put some old 4" planks down and its greatly helped. Just a matter of picking out the odd clump where you've missed a root in the bed.

I don't dig or rotovate and I hoik it out as I come across it.  I think mine comes largely from the grass paths on my plot which I'd like to get rid of completely. It does go down very deep!

Many thanks for all of your replies. I think I'll carry on taking the dock roots away (as there's not too many of them - I just but them in the 'non-recyclable' bin at home - not the 'garden waste' bin as I don't want to pass the problem on to anybody else).

As for couch grass, I'll not risk composting them even after drowning or black bag storage - but I think I'll adopt a hybrid approach - I'll black bag them until such time as I have a bonfire 

But I also need to make barriers where they encroach onto the beds - obviously a longer term project dependant on availability of materials. Still, at least I now have a plan