Blackberries

Information from Paradise Nursery website.
Triple Crown Thornless Blackberrypad Yes, we really did pick this Triple Crown berry! Triple Crown blackberries are one of the newer thornless blackberry introductions and a real credit to the hybridizers. The sturdy vines are less erect than Navaho, requiring more support when they are young - especially when the summer harvest of huge blackberries appears! Triple Crown plants have the capacity to produce larger berries than any other variety we have seen, so be prepared to fertilize them well if you'd like to have award-winning blackberries. Their size does not make them insipid - these have a wonderful sweet flavor and are a thrill for kids to pick.

Information from Indiana Berry website.
Triple Crown—Large, sweet, aromatic blackberries called "Triple Crown" may run away from the competition once they begin appearing in supermarkets around the country in a few years. Triple Crown is the newest thornless blackberry from the Agricultural Research Service's Fruit Laboratory in Bellsville, MD. The berry is named for its three crowning attributes—flavor, productivity and vigor. It's being offered for sale by some nurseries for the first time this year. Triple Crown ripens from about July 10 to about August 10. The plants yield large, glossy black fruits that are pleasantly firm and able to withstand the rigors of shipping. Attractive and flavorful, it ripens later than the popular "Hull Thornless" blackberry and a week or so earlier than another widely planted berry, "Chester Thornless." Triple Crown berries are larger than both of these other commercially grown varieties, and should help ensure that berry farmers, owners of pick-your-own operations and backyard gardeners have a constant supply of big, flavorful thornless blackberries throughout the ripening season.
Michella's Vineyard