Plant Profile: Heracleum maximum

Cow Parsnip is a biennial herb or a short-lived perennial wildflower belonging to the carrot family, primarily found in North America and temperate regions of Asia. It stands out as the sole representative of the genus Heracleum in North America, with its presence noted in the western mountains of North Carolina. This plant typically grows along the edges of marshes, beside streams, and in moist, open meadows.

During its first year, Cow Parsnip develops basal leaves, but in the second year, it produces a flowering stem that can reach heights of 4 to 8 feet. Atop this stem, a compound umbel measuring 6 to 8 inches showcases numerous small white flowers, which are highly attractive to a variety of pollinators.

Cow Parsnip thrives in silty or sandy loam soils and prefers full sun to partial shade, although it can adapt to other soil types as long as there is sufficient moisture. While it requires moist conditions, it does not do well in overly saturated environments. This plant can become invasive, making it best suited for naturalized settings like woodland edges or meadows, where it can effectively draw in pollinators.

Caution is advised when handling this plant; its sap can cause skin irritation if exposed to sunlight, leading to blistering. Therefore, it is essential to wear gloves when working with Cow Parsnip.