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As plants continue to respond to global warming with phenological shifts, our understanding of the importance of short‐lived heat events and seasonal weather cues has lagged relative to our understanding of plant responses to broad shifts in mean climate conditions. Here, we explore the importance of warmer‐than‐average days in driving shifts in phenophase duration for spring‐flowering woodland herbs across one growing season. We harnessed the combined power of community science and public gardens, engaging more than 30 volunteers to monitor shifts in phenology (documenting movement from one phenophase to the next) for 198 individual plants of 14 species twice per week for the 2023 growing season (March—October) across five botanic gardens in the midwestern and southeastern US. Gardens included the Holden Arboretum, Kirtland, OH; Dawes Arboretum, Newark, OH; Chicago Botanic Garden, Glencoe, IL; Missouri Botanical Garden, St. Louis, MO; and Huntsville Botanical Garden, Huntsville, AL. We tested: (1) that higher‐than‐average daily temperatures (deviation from 30‐year historical mean daily temperatures for each location) would be related to truncated phenophase durations; and (2) that phenophase durations would vary among species. Our findings support both hypotheses. We documented significant inverse relationships between positive deviations in daily temperature from historic means (e.g., warmer‐than‐average days) and durations of three reproductive phenophases: “First Bud,” “First Ripe Fruit,” and “Early Fruiting.” Similar (non‐significant) trends were noted for several other early‐season phenophases. Additionally, significant differences in mean phenophase durations were detected among the different species, although these differences were inconsistent across plant parts (vegetative, flowering, and fruiting). Results underscore the potential sensitivity of understory herb reproductive phenophases to warmer‐than‐average daily temperatures early in the growing season, contributing to our understanding of phenological responses to short‐term heat events and seasonal weather cues. 

Combining ecological questions with evolutionary con- text generates novel insight into both ecology and evo- lution. However, our ability to draw broad inferences can be limited by the taxonomic diversity present within and across species at a site. Public gardens (including botan- ical gardens and arboreta) may focus solely on aesthetics in developing their gardens, but some public gardens include scientific inquiry and conservation at the core of their missions (Hohn, 2022). These scientifically oriented public gardens follow community standards of excellence (Hohn, 2022) to provide unique access to curated plant collections specifically designed to gather high levels of biodiversity, both among and within species, at a single geographic location. These research‐grade collections include long‐lived species cared for over many decades. Such public gardens have long histories of conducting and supporting research harnessing the power inherent in these diverse collections, including explorations of sys- tematics, ecophysiology, and ecology. By bringing together species, as well as individuals within species, from across broad spatial ranges into a single site, these collections offer living repositories of diversity ripe for scientific exploration as de facto common gardens (Dosmann, 2006; Dosmann and Groover, 2012; Primack et al., 2021).