Like other invasive perennials, Bishop's-weed, also called Bishop's Goutweed (Aegopodium podagraria), can be difficult or time-consuming to eradicate once it's established. As with other weedy perennials, the only way to get rid of it is by either spot-treating it with systemic herbicide (potentially more than once if it regrows) or by digging it out, roots and all.

If you prefer to avoid chemicals, remove it manually and be thorough and vigilant for regrowth from missed pieces. The faster any new foliage regrowth is removed, the faster the roots will run out of stored energy and starve, killing the plant. Well-established perennial weeds may take weeks or months to eradicate with this approach if you're avoiding herbicides, though even with herbicides, the process may take a while depending on how resilient the plant is after treatment. The most commonly-used systemic herbicide ingredient is glyphosate, since other systemic options run a greater risk of entering groundwater or being absorbed by other nearby desirable plants if any of the chemical enters the soil. (Glyphosate binds tightly to soil, so isn't likely to move anywhere if spray drips get on the ground.) Check the product label to see if it provides information about the best time of year to apply it (often early fall for perennials, but for some species it might not matter, other than temperature restrictions) and how often it can be re-applied. Each application will need time to move from foliage into roots and then generate symptoms, so give it time before determining that another dose is needed. If the plant has lost foliage for winter, you'll need to wait for regrowth in spring to begin treatment.

Miri