Cinta to be clear - the sedum I brought inside are mostly from mexico and cold hardy to zone 8 or 9, so only marginal for me here (plus we get so wet that they don't like that) I don't think these ones need any cold, but they do need airflow, so I have a fan going along with grow lights for this pot, the others are in windowsills, I leave my windows open most of the winter so there is airflow that way. I've been spray misting them since they don't seem to like being too wet, just until they get more rooted!