I live in Southern Ca. Inland Empire, I have 10 queretaroensis seedlings that I was lucky enough to buy from nullzero, 4 yrs ago which I believe were 1 year old when purchased, so at 5 years old now, the seedlings are all about 4 feet tall and looking great.
I have several more from seeds that I sprouted, I also got those seeds from nullzero and at less than 4 years old, those are also 4 feet tall with one of those 2" shy of 5 feet from soil line. All seedlings are on their own roots, in 15gal pots and never grafted. Thanks null!