No not sure about GMO, maybe University of Arkansas selected instead of bred. It has been a great grower and producer for me. Fruiting on the primo canes is no joke easily double the next best crop on the year. My little boy loves raspberries, I’ve been wanting to try heritage. Good to know about taste on mysore. I’ve heard they grow well here but if it doesn’t taste like a raspberry then might as well go blackberry! I have some native Texas dewberries selected that I dug up from the wild. They are thorny as all get out and require some water and trellis training to get them off the ground, but it’s one of the best berries in the world. None of the generic blackberry taste. We’ve foraged for them since I was a kid. I can taste the dewberry cobbler now. Can send you some slips if you want, send me a pm. I will warn you they are THORNY though