Answer: It is possible to overwinter four o'clock roots by keeping them in a cool (about 45 degrees) place, and then replanting them the following spring, after the soil has had a chance to warm. Gently clean off the soil, allow the root to dry off for a few days, and then store it. The root can be nestled in wood chips, sawdust, or peat moss, then set in a paper bag or cardboard box which allows for some air flow. Like so many things in gardening, there aren't really specific instructions -- everyone finds their own most workable storage place and materials, and works from there. Good luck with your four o'clocks!
Q&A Library Searching Tips