Sour cherries have been a disappointment for me. I have a from Cummins that I planted in 2015 and 2016. Balaton on Gisele12 and a Surefire on Mahaleb. Neither has grown much. The Mahaleb rootstock looked like it had been regrafted a few times. It was over in 1" thick below the short scion with thick roots. Despite that huge rootstock, it is still less than 5ft tall after 5 years. The Balaton/Gisele looks healthier but it is only about 6ft tall. I had another in 2015, a Sumadinka on Mahaleb, that was the worst tree I ever got from Cummins, especially since I was charged for top grade feathered tree. It was about a 36" tall whip with a couple tiny side roots. It started to leaf out but was dead by July. Maybe if I had potted it and babied it, it would have survived.