I use wheat and barley, BOSS, and millet. Occasionally lentils. (I sprout lentils mostly for myself.) Agreed with previous posters, any seed mix meant for consumption is fine for sprouting. I buy a bag of barley or wheat, and a bag of BOSS every fall. The flock gets sprouts during snow season. Occasionally, feed grain will be heat treated. Whole corn would be an other option. Don't use bird seed mixes which have sunflower chips or cracked corn. I would research milo or sorghum before sprouting that. Some folks have trouble with oats b/c it apparently is more prone to getting moldy or sour.