Mike from Rochester Ny writes
Unfortunately, Casoron 4G Herbicide is not labeled for mugwort and not for use in oriental lilies. Unfortunately, we are unable to find any pre-emergent herbicides that are labeled for mugwort, or that specifically labeled as safe for applications to oriental lilies. We suggest reaching out to your local nursery or to the master gardener at your local county extension office for treatment recommendations.
Answer last updated on: 02/14/2022
