I have grown an avocado plant using the infamous toothpick method, i.e. suspending an avocado pit in water using toothpicks. Since the avocado pit contains the necessary nutrients, I left it in water for over a year while the plant was growing. I have since potted it into soil, but the pit hasn't vanished so I imagine it is still taking nutrients from it.
Can I add another avocado pit to the soil, close to the "original" one to feed the plant? Will the roots attach to this pit over time? If not, can I blend the avocado pit into tiny fragments that I can use to fertilize the soil?