User blog comment:CopperCookie/Hard Mode Bosses/@comment-11754715-20131027163243

in theory, Plantera is easyer than the Twins, Skeletron Prime and the Destroyer, because Plantera's Blob spawns after you have killed one of these bosses.

By the way. if you make a house with a bed near the place where you fight Plantera and set your spawnpoint there. Plantera doesn't go away if you die, only if you are to far away.

It also helps if you go to the surface after Plantera spawns and build a sky bridge of platforms a couple blocks above the surface. since Plantera's "travel arms" can't grabe on platforms Plantera will have trouble to get to you. i hope they don't fix that by the way ;)

I hope this was usefull to you and your brother :)