One might think that silene capensis would be rather tender being from South Africa. Well, apparently silene capensis can tolerate freezing temperature better than most plants. The silene capensis plant shown above has been subjected to freezing temps for at least three straight days with the thermometer dropping as low as 27 degrees F. According to Wikipedia, it seems that silene capensis can tolerate temps down as low as -5 degrees C (about 23 degrees F). With the leaves in such good shape on young plants, I am willing to bet that this species can withstand even lower than what Wikipedia predicts.
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