I think uptown has sort of covered this. Not sure if you know what a Kina is .... oh yeah they are also known as sea eggs. In any case just, collect and crush a heap of shellfish Kina also if possible. You want enough to probably 1/4 -1/3 fill a 10 or 20 liter bucket and top up with water. Make sure you have a lid and keep it outside. keeping it in the sun is good because you want it to ferment. You can use this straight off. after it has had time to ferment a little ( you'll know when it is truely at it's prime) you can decant a bit...say 1L into a 2L bottle and top this up with water and use as you would to feed your plant. With the brew you have made just keep adding water and from time to time some more shell fish and you'll have a continuous supply of the best plant food, and to top it all off you'll keep the greenies happy. Although this is an amazing growth food the type of tree you are trying to grow from all accounts only grows up to 12" per year.