https://hortnews.extension.iastate.edu/2020/09/purple-carrot-seed-moth-new-invasive-insect-iowa

Hello Kristina,

That looks like a purple carrot seed moth caterpillar, a new invasive species that was first found in Michigan a few years back.

See https://hortnews.extension.iastate.edu/2020/09/purple-carrot-seed-moth-new-invasive-insect-iowa

For homeowners, recommended products for controlling insect pests on ornamentals and vegetable garden plants ar cyfluthrin (sold as BioAdvanced Vegetable and Garden Insect Spray, Insecticide), bifenthrin (sold as Ortho Bug B Gon) and carbaryl (sold as Sevin). Neem oil an DIpel may also be effective. Be kind to our pollinators by spraying in the evening and avoid spraying blossoms. Be sure to read and follow all instructions on the label before using any pesticide.

Best regards,

Howard