I sowed them in my compost. I covered them too. Mostly clay soil here. But I didn't try them a different method, but I knew not to sow them in compost again. My compost also has some soil, not all 100% compost either. Like I said it's not something to suggest to a newbie to try. I don't sow my seeds in clay soil either. I sow them in potting soil or starting soil for seeds. Much looser soil. Perhaps I think my compost was too rich, it came from my worm bin.