Sea Island Jamaican Bat Guano Pure High- Phosphorus (1- 10- 0) Nothing is better for blooming flowers or ripening fruits than pure, high-phosphorus Sunleaves Jamaican Bat Guano (1-10-0.2). Listed by the Organic Materials Review Institute (OMRI), Jamaican Bat Guano is most effectively used at the root zone to heighten root and flower development. Gardeners can amend their soil with it, use it as a top dressing or create a "guano tea" and apply it directly to plant roots in a fortified water dilution.