Hello. They do use non-vegan products, including stuff like bonemeal, I'm afraid - being vegan isn't part of the organic standards. So do non-organic farmers, of course.
I think if you search for the word "veganic" you will find some threads about this issue, and you might also want to look at this website:
http://www.veganorganic.net/index.php
Maybe you could try and get an allotment if you would like to try growing your own? I've managed to grow a few veg veganically in pots but I wouldn't say I'd ever been self-sufficient
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