I used 6 bags around my tree last fall. Haven’t done much this winter but going to fertilize and spray some iron this week, then more manure and maybe peat moss next month.
Too expensive to use liquid nutrients on an 18’ tree so I’m giving these a try.
I have some yellowish leaves on the top half and I’m guessing/hoping it’s from lack of iron.
They all seemed to handle the cold weather without too much damage. Should have lots of new growth in another month or two.