I would sprinkle it on the top, and use your fingers to lightly mix it into the top ~1/2 to 1 inch of the soil (being careful of any roots). But I have been lazy in the past and just added to the top with no "problems" ('YMMV' tho )sounds like a plan, thank you, now can I mix it in from the top of the soil while its in the pot, or should I mix it into the soil before potting it?