ZZ plants are used as landscape plants in the southern part of the state but won't survive cold winters here. I used to see them at our Home Depot garden centers but I guess they must have lost popularity because I haven't seen them for sale around here in a couple of years. I had a large ZZ back a few years ago but lost it to the winter freeze last year. I had luck rooting the stems in water once. I put a stem in a glass/jar of water and after a few weeks thin roots appeared, then at some point the little rhizome formed. I had forgotten all about ZZ plant until I was out in the yard a few days ago. I was transplanting a few things and in the same pot as a dracaena was a little maybe 4" tall stem with two leaves. When I pulled it out of the soil I recognized that little plant ... a ZZ. I repotted it in it's own little container and will wait and see how it does. This photo is my ZZ plant on December 8, 2007:
