Grew a few assorted grass trays for my baby tortoise, and then saw this offfering. Purchased a small bag, sprinkled in on of my soil trays, and three days later the seeds were already sprouting. My grass seeds usually take at least a week. Highly recommend these seeds, very viable. I tend to grow three to four trays, so I can change them out before the little girls eat the greens down to the ground . . . this way they can grow and refresh themselves between changes. ??????