Sometimes when you stop trying hard for something it just seems to happen on its own. We have had a pair of avocado trees volunteer in the middle vege garden. How an avocado seed got in there we don't know but I suspect small hands and a bit of mischief might have something to do with it. Of course we can't have avocado trees growing in the middle of our vege garden so we made the decision to transplant them to the bottom of the chicken coop in the old sandy loam garden that was there. Avocados like lots of drainage so they should be happy there. Cross fingers... we might finally be on the way to some Persea americano goodness.