I've just removed everything (12 tons of concrete, old shed and dead trees) from our garden and now have a rather intimidating blank canvas in front of me. The idea is to eventually design a wildlife garden with a microclover/grass seeded lawn in the middle, but that won't be until next year. Meanwhile, I want to stop the garden turning into a haven for weeds. I don't really want to put down unenvironmentally-friendly plastic sheeting. I've thought of laying bark chippings, but I'm worried that I won't be able to seed the grass over this. Could anyone help with this?