Posted: 25/09/2015 at 15:52
I have found that hostas divided in autumn sulk and sometimes die so best to wait till spring. However, if you need the pot for something else, there's nothing to stop you simply separating the two hostas and planting them while the ground is still warm enough for them to recover and re-root.
You can then divide them in spring assuming they're big enough and that that's what you need to do. You'll need to be vigilant with the wildlife friendly slug pellets once they're in the ground though. Start sprinkling lightly on Valentine's Day cos it's easy to remember and then weekly, still thinly, through the season. This gets the perishers as they emerge form hibernation or hatch from eggs and stops them feasting on your treasures and breeding.