Acalypha gracilens, commonly known as Slender Threeseed Mercury or Shortstalk Copperleaf, is an annual herb native to a variety of habitats in the southeastern United States, including open woodlands, forest edges, and disturbed areas such as roadsides and fields. It is particularly common in frequently burned pine communities and coastal plains. This plant typically grows up to 3 feet in height and features pubescent stems with elliptic to lanceolate leaves that can add a textured greenery to garden settings.

Slender Threeseed Mercury is valued for its adaptability to various soil types, provided they are well-drained. It prefers full sun to part shade and is drought-tolerant once established, making it a low-maintenance option for gardeners. The plant produces inconspicuous flowers from spring to late frost, with separate male and female flowers on axillary spikes. The flowers are not particularly showy, but the plant’s ability to flower throughout the year in southern Florida can provide consistent greenery. It is often used in restoration projects and as a filler in garden beds. The seeds are dispersed by an explosive mechanism or by ants, which can contribute to its spread. While not typically problematic, its seed dispersal methods can lead to self-seeding in gardens, which may require management.CC BY-SA 4.0