I am attempting no dig on my allotment, it’s a plot I have just taken in and it was just a patch of grass so decided to attempt not to dig 😬. I cut the grass back and covered for a couple months, raked it over then lay cardboard down before covering in mushroom spelt compost and so manure (about 4inches or so). All was looking good but went up there today and grass has started to poke through. I thought the cardboard would stop the happening? I know there are a few gaps from overlap but I have patched these up with more cardboard but one area is particularly bad with lots of grass poking through. Have I not added enough compost? Any tips gratefully received .