I make my own blend for the little acre that my nursery occupies. I try to keep pH, macronutrients, and micronutrients as close to ideal as I can. After applying 3 tons of lime to the acre in 2019, my pH has been at a perfect 6.5 – 6.9. Local soils can sometimes dip into the 4.5 – 4.0 range, given their acid shale parent material.
In 2020, I had to add zinc. 2021, I needed extra boron and copper.
This year, I made a blend of the usual urea (nitrogen) and muriate of potash (potassium), plus some extra sulfur.
I’ll likely need to add a dose of magnesium via epsom salts, come autumn.