<p>The influence of vertebrate herbivores on plant populations can be significant. Herbivores can impact plant vital rates, including survival, growth, and reproduction, but disturbances can mediate this interaction. While the herbivore-plant-fire feedback has been well studied in various grasslands, little is known about the dynamics between herbivores and understory plant populations in pine savannas (<i>Pinus</i> spp.) post-fire. Our study aimed to understand how the dominant understory bunchgrass species, wiregrass (<i>Aristida beyrichiana</i>), responds to herbivory. Following a summer prescribed fire, we selected 60 wiregrass individuals and placed metal-mesh fences around half of them (n = 30) to exclude vertebrate herbivores, while the other 30 remained unfenced. Plants were monitored over two years for tiller length post-fire (i.e., growth), basal area, and reproduction (whether the individual was reproductive and the number of flowering culms it produced). Our results showed that herbivory exposure reduced the probability of wiregrass reproduction by approximately 25%, while wiregrass tiller length and the number of flowering culms were unaffected. The effect of herbivory on reproduction was size-dependent, declining with increasing basal area. In addition, tillers were longer for plants with a greater basal area 5 months post-burn. These size-dependent responses were likely driven by differences in resource availability and allocation. Herbivory and fire did not significantly affect plant survival; all wiregrass plants survived during our study. Although wiregrass reproduction is mainly stimulated by fire, our findings emphasize the value of integrating herbivory pressure into plant population dynamics, underscoring these interactions in pine savanna functional integrity.</p>