As I recall (and things might have changed), J&P roses were only grafted onto Fortuniana for MerryGro, a nursery in Florida that has since gone out of business. We in the Dave's Garden rose forum bought lots of roses from MerryGro when it was in the process of shutting down. That was the one and only time I bought J&P roses grafted onto Fortuniana.
Incidentally, Fortuniana is an excellent rootstock for California. On the average, my J&P roses from MerryGro are easily twice the size of the J&P roses I bought through the years directly from J&P, which were grafted onto Dr. Huey.
Is it possible, Steve, that the roots on your Sunsprites looked different because they were own-root roses? Sunsprite seems like the type of rose that doesn't need grafting to perform well. J&P didn't climb onto the own-root bandwagon until a comparatively short time ago, but even in the past they never grafted their Simplicity roses or their Meidiland landscape roses because they simply didn't need it.
