Does any one knows what makes a plant purple? I have bought strains that were known to be purple but just werent always purple. Like for instance if you have heard of a strain called granddaddy then you would know its suppose to be a naturally purple strain. I have bought this strain at the club before and on different occassions the buds werent even purple. Sometimes there batch would be and sometime it wouldnt. Is this have to do with the growth cycle?