I have inherited my grandparents garden and need some help with the Bergenia. This is the second season for me in the garden. Don't know how old they are, maybe 20/30 years. I don't think a lot was done with them. I'm wanting to turn this area into a part shade Butterfly/hummingbird garden area. I live is San Mateo, CA and once the Sun gets higher in the sky this part of the garden will get late morning/afternoon sun.

1.) How do I divide them, so I can thin/move them around so I can plant other things that will be for the Butterflies/hummingbird?
2.) What plants will do well with Bergenia and be inviting to Butterflies/Hummingbirds.

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Nick Rose