Huddle a few plants together and top-dress the pots with sphagnum moss or helxine, the mind-your-own-business plant, to create a microclimate and water frequently in summer with a fortnightly feed and do not let the compost dry out in winter.
There is a wonderful variegated form of this and you would need to ask for Helxine, although the botanists have now changed this to Soleirolia soleirolii Aurea.