Dan, You could try covering them on the cold nights. Use of some heat tape under the mulch? How often do you have below 20 degress nights? Or bring them in for the cold months to be on the safe side.
Baja, I purchased some Dyckia seeds on ebay and most sprouted for me and then took forever to grow. After one year, I was lucky to have any over 1 inch. I over watered one winter night and that's all it took, Next day all dead with rot. Trouble with growing seeds indoors during winter months. Too dry then too wet. My Aloes are much more hardy to water and dry spells.
