One main fertilizer we use is guano - bat shit! I had used it to plant before, but today we went to the caves where the rat bats live to harvest it. In Jamaica, bats are called "rat bats" while these big black moths are just "bats." We climbed into this tiny hole in the stone into a wall, which opened up into a larger cave. It was amazing! We filled several bags with the bat poop, and walked back home, where we promptly went to the beach and washed it all off.
Also: I got stung, again, bringing my total count up to 3.