Tall Water Parsnip

About Tall Water Parsnip

Tall Water Parsnip is a stately semi-aquatic wildflower that brings architectural interest and immense ecological value to wet landscapes. Growing 3 to 6 feet tall, it features hollow, ribbed stems and large, flat-topped clusters of tiny white flowers known as umbels. These blooms appear from mid-summer into fall, providing a crucial nectar source for a wide variety of pollinators, including beneficial wasps and beetles. Most notably, it serves as an important host plant for the larvae of the Black Swallowtail butterfly. Native to wetlands, swamps, and shorelines across North America, Tall Water Parsnip is perfectly suited for pond edges, rain gardens, or consistently mucky areas. It thrives in full to partial sun and requires wet to medium-wet soils. While it resembles some toxic relatives like Water Hemlock, its once-pinnate leaf structure and habitat preferences distinguish it as a safe and desirable addition to any water-focused native garden. Its ability to thrive in saturated conditions makes it an indispensable tool for wetland restoration.