Buy the 2015 Old Farmer's Almanac!
Don't separate them but tryDon't separate them but try to carefully move all 4 tubers together with the soil into a bigger pot. Or, you can leave them in the pot and separate them in the fall, after they are done blooming.

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats