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1.  Climate change in northern high latitudes is predicted to be greater in winter rather than summer, yet little is known about the effects of winter climate change on northern ecosystems. Among the unknowns are the effects of an increasing frequency of acute, short‐lasting winter warming events. Such events can damage higher plants exposed to warm, then returning cold, temperatures after snow melt, and it is not known how bryophytes and lichens, which are of considerable ecological importance in high‐latitude ecosystems, are affected by such warming events. However, even physiological adaptations of these cryptogams to winter environments in general are poorly understood.

2.  Here we describe findings from a novel field experiment that uses heating from infrared lamps and soil warming cables to simulate acute mid‐winter warming events in a sub‐Arctic heath. In particular, we report the growing …