Answer: Hostas can grow quite large and as a result can have a rather large rootmass. This rootmass is practically solid so you'll need a sharp spade to divide a large plant. I dig the entire plant up, lay it on its side, and slice through the rootmass with a spade. You'll want each division to have both foliage and roots so the size of your divisions will be determined by the size of the hosta. It's best to get them into the ground as soon as possible but you can easily transport them if you pop the divisions into a large pot and cover them with soil (to keep the roots from drying out). Set several thicknesses of wet newspapers over the top of the pot and set it in a cool place out of direct sunlight. In the trunk of a car they can last an hour or two, depending upon weather; inside an air conditioned car they can last up to 6 hours before the soil and the newspapers begin to dry out.
Best wishes with your new hostas!
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