Does anyone know what understock would have been used on a “tree rose” version of ‘Petite Knock Out’?
This photo is from a local Lowes hardware store. Note that the understock has sent out long canes, overtaking the actual budded rose. I don’t have an interest in ‘Petite Knock Out.’ On the other hand, I have quite a bit of interest in understocks for budding/grafting. Any idea what this understock is?
Please note that it does NOT appear to be R. multiflora, which I initially thought it might be.