How to spot invasive garlic mustard and stop its spread.
Garlic mustard can fool you twice—first by its harmless appearance, and then with its innocent backstory.
“It was likely brought as a medicinal pot herb,” says Michelle Fonda, an invasive species biologist with the West Virginia Division of Natural Resources and liaison for the West Virginia Master Naturalist program. “You can eat it. I’ve even made a pesto out of it, although it’s pretty strong.”
Some invasive species arrive accidentally, but many others arrive intentionally as food, medicine, or ornamentals, and that pathway still fuels new introductions and continued spread, Fonda says.
But it doesn’t stay innocent for long. Introduced to the Americas in the 1800s, garlic mustard didn’t evolve in West Virginia’s woods and doesn’t have the same natural pressures—predators, competitors, and relationships with other plants—that keep native plant populations in balance. Without those natural controls, it spreads fast, pushing out native species, including spring ephemerals, Fonda explains.
It can also do harm in ways you don’t see at first glance. Fonda points to the West Virginia white, a butterfly that normally lays eggs on native mustards. When it mistakenly deposits an egg batch on garlic mustard instead, toxins in the leaves can kill the caterpillars before they ever become butterflies—a major factor in the species’ decline in the area.
The good news: Garlic mustard is easy to identify, once you know the trick. It’s a biennial, and in the first year, it appears as a low rosette. In the second year, it shoots up, flowers, and seeds. The fastest confirmation is hands-on—crush a leaf and sniff. “The smell will be very garlicky, hence its name, and none of the lookalikes have that kind of aroma,” Fonda says.
It’s shade-tolerant and thrives in disturbed, rich, moist soils—woods, creek banks, trail edges—and especially in quiet, shaded pockets. It often completes its life cycle before the tree canopy closes.
For home gardeners and landowners concerned about the plant, Fonda recommends pulling by hand right after a rain, when the ground is soft, then tamping the soil back down so you don’t wake up more seeds. Do not compost the pulled plants if they’re flowering or setting seed. Larger infestations may call for herbicide, but only with a great deal of caution. She stresses the importance of reading the label carefully, following the instructions exactly, and paying attention to where and how it can be used.
And plan to come back, she adds. Because garlic mustard is a biennial, control isn’t one-and-done. Two consistent seasons of vigilance and effort can knock it back—especially if you follow up by planting native wildflowers and spring ephemerals to reclaim the forest floor.
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