(Curtis White, NPS)
At least 27 species of plants are found within the wetland areas surrounding the Saugus River. Many of these plants are common throughout the marsh, such as narrow-leaved cattail. The tall wetland vegetation provides excellent habitat for nesting red-wing blackbirds and other bird species and breeding fish, such as the fourspine stickleback.
Wildflowers are also abundant throughout the year at Saugus Iron Works. Jack-in-the-pulpit, skunk cabbage, jewelweed, goldenrod, and several species of asters can be found throughout the historic site. Saugus Iron Works is also home to three species of fern: sensitive fern, cinnamon fern, and lady-fern.