I planted 2 avocados last week. I lost 2 seedlings last year to the floods. I'm hoping the charcoal will help with drainage.

If you can grow avocados, you can probably grow macadamias. They're about the only nut that has a decent fatty acid profile (ie not PUFA dominant).

I haven't had a lot of joy with the coconut I planted, but it's a lovely Palm.