You might have to try it and see
I know that with the âSubcool Super Soilâ mix, youâre only supposed to fill the bottom 1/3 to 1/2 of the pot with the mix, and the rest with a standard potting soil. Never tried this myself, just parroting what Iâve read.
However, the store-bought super soil Iâve tried â Coast of Maine Stonington Blend â is just used as a standard potting soil, fill 'er up. Never had problems with burning on established plants. Iâm guessing what youâve bought is in that end of things.
Is there a back label with more info or a handy website for the brand?