My Observation. What Do You Think?
Per advice of many in this forum,
1. I try to bury graft/bud union, if the shank is not too long.
2. I do not allow mulch/ alfalfa pallets/ compost come in contact with the canes.
Most of my roses lost all or most of their original canes to canker or die back. I blamed it to insufficient root system, bad specimen, or just the way roses behaved. They slowly regrew new canes or added structure to what was left, forming bud union above ground. I have not lost a plant yet, but I have many weak ones in the yard.
While I was picking up my roses at Regan last month, I mentioned that to the lady who was helping me. She said that it was because I was planting them too deep and if I wanted own root plant, I should bury bottom of the graft and let the sun hit the top part. Having nothing to loose, I planted them this way this year. No cane loss yet!
Today, as I was moving the pallets which were piled too closely to the canes and center of the plant, I noticed that the roses that went backward, were all planted deep.
Now that I think about it, it kind of make sense. While planting deep, wet soil touching the canes make them rot.
Maybe that's why many say that in warm climates, bud union should be above ground.
What do you think?