I've just purchased a beautiful huge Midnight Reiter which looks as if it's already root bound in it's pot. I'd really like to be able to divide it now but I've had mixed results in the past (hostas - GREAT, coral bells -- terrible and shocky for more than a season after) so I'm here to ask if anyone out there has divided perennial geraniums and if so do you have any tips for me? Can I divide with a sharp shovel or do I need to delicately separate the roots or what? Thanks!