I get organic seeds at Whole Foods Market for me and my birds. I sprout most of them before I use them. I think the main thing to look for is if they will sprout or not. Try to sprout some of them and if they don't sprout, they're probably old. Also, the bad seeds will float and you can just pour them off the top. If it's quality seed, there won't be very many that float. I've even sprouted a parakeet seed/pellet mix. I don't recommend it. It gets really gross when the pellets break down.