I am looking to make a plugin that extends the radius of the bonemeal growth event, have been searching the code base for bukkit and cannot seem to find the growth event for bonemeal's use on a grass block. Any ideas? Similar to http://forums.bukkit.org/threads/disable-override-bonemeal-usage-on-crops.27922/ EDIT: I believe I have found something that refrences the event http://forums.bukkit.org/threads/apply-bonemeal-effect-programmatically.63470/
Get the event when a player right clicks on a block with bone, cancel the event, apply your own grass/flowers to the surrounding area with a simple random generator.