Veganics Defined Seriously, the core difference between the two is the fertilizers a farmer chooses to use. If the birds and other animal wild life already living in the fields leave droppings the farmers aren't going to complain, because other beneficial insects break down the animal droppings in the fields. Veganics as it applies to an indoor grow operation... No guano, chicken/horse/cow/lamb manure, blood meal, bone meal, feather meal, fish emulsion. Earthworm castings are fine because most do not mistreat or slaughter earthworms. Most people just feed the worms and leave them alone to do what they do. Earthworm castings are generally in the soil already and earthworms are part of the soil food web. BioCanna is veganic.