for various reasons. It's possible that the root somehow took over the whole plant.

Botanists and plant people could explain it better.

If you have a grafted rosebush, the graft needs to remain well above grade.

Usually when the grafted rosebush is doing well, you won't get canes coming up from below the graft. If you do, they should be pruned off and the plant may need attention to restore it back to good health.

I generally limit a grafted rosebush to about 4 healthy canes. Keeping them well pruned, fertilized, disease and pest free helps.

the rootstock survived. When I looked it up, it turned out to be a Dr. Huey rose. Dr. Huey is frequently used for grafting more delicate hybrid tea varieties. If your "new" rose turns out to be a flattish double circle of red petals with a white center, it might be Dr. Huey. I posted an image of it. Incidentally, I have read that roses in planter pots are more likely to be hurt by cold weather than those in beds.

You may have answered it. Here's a pic of the red, couple days after cutting.




HERE's Mr. Lincoln bud, a neighbor to the Austin.



Just moved them today from protected patio, their winter home, to front of the house where they are more subject to wind and cold.

I tried pretty hard to dig up the rose bushes when I first moved in. Only the lavender roses bloomed last year. This year I got extra, wild looking red dudes, who just showed up.



Wide red dudes

Only have one sad looking pink bud now; did have one closer to open a few weeks ago. Your lavenders look nice.

Nice and healthy. I've had some aphids this year. Unleashed the ladybugs on them.

all pink and lasted very late into the season. Did have japanese beetles, for which I treated it (and Mr. Lincoln nearby.)

Have some black spot, for which I've treated. VERY wet here, so fungi to be expected I guess.