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When do grasses resprout after fire?

Fire can drive selection for plant traits or strategies that enable populations to survive or recover from this disturbance. Two main persistence strategies are used by plants to regenerate after fire: resprouting, where individuals are termed ‘resprouters’; or from seed, known as ‘seeders’ (Clarke et al., 2013; Pausas & Keeley, 2014). Resprouters and seeders maximize their fitness differently: seeders reproduce quickly to maximize abundance of viable seeds before the next fire event, whereas resprouters invest inmaintaining and protecting buds (Pausas & Keeley, 2014). Both persistence strategies can facilitate self-replacement of species so that post-fire plant communities are similar to those pre-fire, or initiate succession so vegetation recovers in a predictable way before the next fire event (self-replacement over the longer term). Current understanding of post-fire persistence strategies is largely based on woody species or are regional in context (Bellingham & Sparrow, 2000; Clarke et al., 2013; Moore et al., 2019). In this issue ofNew Phytologist, Simpson et al. (2021; pp. 832–844)make an impressive contribution to further our understanding of how regeneration strategies in grasses (Poaceae) are related to fire regimes. Hypotheses of post-fire grass persistence strategies are tested using a global and spatially-explicit dataset across gradients of fire frequency and intensity.