WHEN POTTING ON HERE IS HOW I ALWAYS GET THE PLANT IN THE MIDDLE OF THE POT. IN THE PHOTO I AM PUTTING A 3" POT INTO A 4" . ENOUGH COMPOST IS ADDED TO THE BOTTOM OF THE 4" TO BRING THE 3" UP TO THE RIGHT LEVEL, PLACE THE SMALLER POT IN THE MIDDLE OF THE 4". FILL THE SPACE IN BETWEEN WITH COMPOST.
POTTING ON A 3" INTO A 4" POT.