I have recently bought a small collection of Mesembs (a couple of Titanopsis and a big bunch of Lithops). The plants have not yet acclimatized themselves. The weather has been quite cold for a couple of weeks (usually it does not drop below 5 ~ 6 Celsius in winter here), but the last few weeks have been quite cold and frosty. I do not know how they are going to respond to the change of climate (I live in a semi-arid climate with very hot summer and a humid spell of monsoon).
If you have any tips for growing Lithops and other Mesembs is sub-tropical climate, please share in the comments section below.