I've used Kaytee brand a couple of times. Only one bag wasnt super green, but the rest were. I think it more depends on the time of year the hay is harvested.. AND how long it has been packaged [from packaging to trucks to stores to sell floors] Just look at it. and sometimes I even open the bag and smell it... or if its REALLY green and I can smell it from rows away... I know I have a good bag
But I defenatly would use other kaytee products... I think they would have a better rep. if they just stuck with hay, instead of guinea pig pellets with yucky seeds and stuff.