My daughter-in-law has sown some 70 toilet roll cardboard tubes with carrot
seed for me in seed compost on the window cill.
I always thought it was wrong to do this because the carrots will "fork" in
compost. Or is it just manure that is wrong to grow carrots in?

I always sow them in soil because of this, but of course this year with the
weather mine/ours have failed.

Is it OK to sow in compost?

Thanks.
Baz