Since the plants do not all flower at once, the area should be rechecked several weeks after the first cutting. The vegetative rosettes can also be dug up if enough labor is available, otherwise, the area should be revisited the following year to remove any newly flowering plants. Burning removes litter and taller plants allowing parsnip rosettes to develop rapidly. When present, wild parsnip rosettes are among the first plants to green up after an early spring burn and they become easy to detect and dig up with a shovel. The following individuals are familiar with wild parsnip.
Control is achieved mainly by hand-pulling.
1207 Seminole Hwy., Madison, WI 53711. Mark Martin, Natural Areas Management Specialist, Wisconsin DNR, Box 7921, Madison, WI 53707. Monitoring is usually accomplished through simple qualitative observations of known infestations. Research is not considered a priority since parsnip does not invade high quality natural areas.