When Is The Best Time To Separate Hostas

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My question is, when do you separate hostas? I’ve read that it’s best to separate them in the spring before they go into full flowering. I’m wondering if this makes sense because my soil has just been added and is still damp. Or should I leave them together for a few weeks so they dry out more than split up? Does it matter what kind of hosta or cultivar are you separating? Sorry for all the questions! 🙂