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The term understock or rootstock and be used interchangeably.
Most rosebushes are budded or grafted onto the rootstock of another rose.
A bud-eye is taken from the desired rose, for example "Double Delight", the bud-eye is grafted to the stem of a growing rootstock rose. After the Double Delight bud-eye produces adequate growth, the top of the rootstock plant is cut away entirely, leaving Double Delight growing on the roots of the understock.
Fortuniana: Is the preferred understock for most southern states and used mainly in Florida, because roses not grafted on Fortuniana rootstock often die because the nematodes in the soil destroy the root system
Manetti: Has more flexible roots that don't break quite as easily as Dr. Huey.