The message
from Kate Morgan contains these words:

Is there an organic way tyo get rid of lesser celandine?
tia
Derek

I generally just wait a few weeks and it goes away by itself.

Neil

me too, I enjoy it when it is there and as Neil has said it just goes
away :-)

In a wild garden, shrubbery or hedgerow, I agree. But I wouldn't want
it in seed beds or rows of cuttings.

Janet.