I thought I'd be really good and follow the way to go and buy organic grow bags and I've used the soil for all sorts of potting.But it has attracted numerous flies into the greenhouse and is quite smelly!!They are even gathering around pots in the garden where I've used it,Is this to be expected and do I now have to buy something to get rid of the flies as it's not very nice being in the greenhouse?Didn't really want to kill things in the sake of being organic,sort of seems wrong.Hints and help appreciated