Voluntary Purchasing Group Fertilome 10640Root Stimulator and Plant Starter Solution, 16-Ounce

Would this be good for a tree planted about 2 weeks ago?

I'm new to planting trees and bought a crabapple tree. Is this product good for it and is it all I would need?

Would it be appropriate to apply this to freshly planted holly & fraser fir trees in december in western nc with freezing temperatures?

Can this be used on tree clipping??