Has anyone successfully propagated buttonbush(Cephalanthus occidentalis) from seed? If so, when did you start the process and what process did you use? I have buttonbush seeds in a number of pots with different soil types, and some in a refrigerator. I have had these experiments going for a few weeks with no results. It may not be the right time to try and propagate this plant. Maybe results will not appear until the spring. Buttonbush seed may have a low germination rate.