thistlebloom
Garden Master
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i'd never before seen any recommendation to bury a grafted union like that. would be hard to keep after IMO.
as a kid i grew a lot of different roses and would lose a few in the more difficult locations from time to time. usually they were the showier and newer varieties that had grafted unions.
Burying a rose graft is actually a common practice in cold climates.
You do have to be watchful of rootstock canes emerging, but it doesn't happen as often as it seems it would.