Morning Laurel,
Looks like Tansy to me! Depending on the size of the infestation, there are several methods that can be used to control and potentially eradicate it...manual control via pulling/digging up plants before they have gone to flower, or if later in the growth cycle, before they have gone to seed is effective. Chemical control options with a variety of herbicides (Glyphosate, 2,4-D, Aminopyralid) exist and are most effective when treated in the spring (before flower) and fall. Biological controls in the forms of the Cinnabar Moth and Tansy Flea Beetle exist as well, but take ~6 years to make any sort of impact...Typically, a combination of all 3 control methods, sustained over several years, will help to make a measurable reduction in the size of an infestation!
- Jackson Morgan, Polk SWCD

Polk SWCD
July 27, 2020, 3 a.m.