This is a one command that makes flowers explode! When thrown they explode after half a second and when they have been placed they explode whenever an entity walks into it.

Download link: http://pastebin.com/WRQpCuYb


Installation Instructions:
Just give yourself a command block with /give @p command_block copy and paste the command into the command block. Then click on "Needs Redstone" to change it to "Always Active" and click "Done." That will install the command creation into your world