I've grown most members of the complex and have a few thoughts to share. I agree with most of what has been said but offer a word of caution regarding repotting. There is an urge when plant is doing well to repot into larger containers. In my experience this is not always wise, and especially so for the petiolaris plants. Rapid growth and offsetting in my collection often happened prior to the plants heading into dormancy. The moisture content in the pot needs to be reduced in increments *as soon as signs of dormancy are noticed*, so that the pots are just moist by the time new growth ceases. I found plants growing lustily one month quickly shut down growth. Too much moisture in the pot and you get crown rot and plant loss. The larger pots take longer to dry off, and the time difference can spell success or failure. I would suggest a largely inorganic medium that can be quickly dried out, and close attention to signs of incipient dormancy, and recommend that the plants be kept in smaller pots for this reason. I haven't run any controlled experiments, its just a gut level feeling. I also haven't been able to determine any rhyme or reason to the dormancy triggers: some plants shut down in winter, some in summer. I believe that uniform warmth with little differential between day and night temps. *may* contribute to forestalling dormancy, but it isn't an absolute. I have watched large offsetting plants take a nose dive within a month, so there is little forgiveness. I also recommend plants not sit in tray water, but be given water only when the need is apparent. For me, the plants did respond to higher than normal levels of humidity, and were grown outdoors in terraria with covers open a few inches while avoiding night time drops by applying bottom heat as necessary. It meant a lot of fussing in my area since the differential is 5-10 degrees even in summer.