How does hackberry do for bonsai? I ran across this one in a friends landscape. I’m going to have to ground layer this one. Any one know if these guys root good?
Hackberry make excellent bonsai. I have had several--all Southern Hackberry (Celtis laevegata). They are weeds. You cannot hurt them. I can't imagine trying to air layer one. THere's no reason to. Just dig the thing up, or rather saw it out of the ground. Simply move six inches out from the trunk, find the major roots, saw through them pull the tree up, hose off the field soil and plant in a training container (smaller the better) with good bonsai soil. INsure the nebari remains buried under two or three inches of soil to prevent die back.
You are likely dealing with regular old common hackberry (celtis Occidentalis), as southern hackberry (Aka sugarberry) doesn't grow that far north. I Sugarberry is susceptible to cold--I got one a long time ago from Guy Guidry (La. collector). It was a spectacular little shohin-sized bonsai. LEaves had reduced to 1/4 inch and less and it has extreme twigging. However, after a few Va. winters (even with protection) it lost all of the fine ramification to freezes.
I currently have a sugarberry I orginally collected in Texas. I planted it in my yard for the last 10 years. I dug it up this spring using the above techniques. In-ground, it also lost ramification every winter, but regained all of it by summer's end. We'll see how it does in a container.