Most roses can grow on their own roots, but it's the rare hybrid tea that can truly thrive enough on its own roots to grow large and floriferous. I have some own-root hybrid teas that look great, but most of them just stay small and rarely bloom.
According to my plant list, I have 584 hybrid teas, but only about 20 of them are growing well on their own roots. About 400 of the 584 are grafted, and the remaining own-root hybrid teas (other than those 20) aren't worth the real estate they're occupying. I'm planning some big changes, opting for maximum impact at minimal care.