I planted two grafted cherry trees in the spring of this year. A Black Gold and a Vandalay, both on Gisela5 rootstock.
In May, I received them bareroot and dug and planted. when planting them I made heading cuts to encourage low scaffolding limb's growth. I see that the trees are not seeming to be establishing themselves with a new central leader.
I am wondering if I made the cut at the wrong time and this could have caused this growth habitat for the trees or what else might be within my range of options if I intend to try to grow both of these as a modified central leader, under 7' tall.
The traditional shape for cherry is a open vase, so you are going to have to actively force it into a modified central leader by removing one of the two branches next year. You are going to have to tie the two branches together to force it grow parallel to the old trunk.