jerijen said:There are some roses that simply don't perform well, unless budded ... but if they CAN make it on their own roots, I personally prefer it.
Your rose, yes, may have been budded to 'Dr. Huey' rootstock, and as Daisy suggests, that rootstock may be taking over.
Huey isn't the ONLY rose used as Rootstock, but it is the most-common, in the U.S.
Learn more about 'Dr. Huey' at:
If you think that at least part of your lavender rose is still living, and you want to save it, you will have to remove all of the canes of 'Dr. Huey' down below ground -- right where they emerge from the roots. If not, it will just keep growin' and growin' -- and in your conditions, it's going to blackspot like crazy.
If you think the lavender rose is gone, I recommend that you dig the Good Doctor up and get rid of him, before he reaches the size of a house.
jerijen said:Oh, I've seen Huey with prickles. 'Dr. Huey' has been bred for decades ONLY as rootstock. It's been selected for vigor, rather than any other characteristics. It's probable that a series of slight mutations has crept in.
Likewise, look at 'Gloire des Rosomanes' ("Ragged Robin") -- which likewise was used as rootstock for a long time. You really see a wide variation in characteristics, from one rootstock reversion to another.
Alternatively, I suppose you could have a different red rose used as rootstock. I bought a rose years ago that turned out to have been budded onto David Austin's 'Claire Rose.'