Minecraft wiki entry for Bone_Meal, associated text: Using bone meal on a sea pickle on a coral block creates sea pickles. This generates sea pickles up to 3 blocks (of coral) away, so a 7( + ) X 7( + ) block (49+ blocks) of coral may be necessary, to return the most sea pickles per given bone meal attempt (more attempts grows them more numerously, exactly - including the range of it growing, like grass with heights on grass blocks - as coral and coral fans, though those others being non-solid blocks).