Janet Baraclough wrote:
I'd also be happy to give anybody as much creeping buttercup as
they'd like.
Don't part with it! CB is superb compost-heap material (and it won't
survive the process).
Ditto, nettles, thistles, rosebaywillow herb,bracken and fern.

Interesting. We have a separate compost heap for weeds, and I would always
put the buttercups on the weeds. Along with nettles (which I know I can
compost as long as they're not in seed, but I tend not to) and an awful lot
of twitch and dandelions!