Growing outside is good but mold is still an issue during the growing process.I sprout my barley grass in the basement.And I grow it outside in 4tier grow racks using 60% shadecloth.The shadecloth protects the grass from direct sunlight,along with keeping the birds at bay.If you desire a steady supply like I do you will have to start a tray every day or so.Deepending on how much you want to consume.Good luck on your growing of grass,it is a challenge worth taking.Feel free to shoot me an email if you have issues with your grass.may you be blessed with vibrant health!