Garlic mustard

Genus: Allaria

Species: petiolata

Description: Biennial herb of the mustard family. new leaves produce a distinct garlic odor when crushed. The fragrance fades as leaves age, and is virtually non-existent by fall. Adult plants range in height from .05m to 1.9m (1.5 - 6ft) and average 1m (3.3ft) at the time of flowering.

Where it grows: Garlic mustard is most common in deciduous forest and invades forested communities and edge habitats. It is also common in river-associated habitat.

How it spreads: Garlic mustard spreads exclusively by seeds which typically fall within a few meters radius of the plant. Seeds are transported by natural area visitors on boots and in pant cuffs, pockets and hair, and by roadside mowing, automobiles and trains. Seeds are widely dispersed in floodwaters.

What it threatens: No known natural enemies in North America, is self-fertile, and is difficult to eradicate once established. One of the few alien herbaceous species that invades and dominates the understory of forested areas, appears to alter habitat suitability for native birds, mammals, and amphibians, and may affect populations of these species.

More information: 4 County Cooperative Weed Management Association

Disclaimer - Clean Water Services does not endorse or recommend specific herbicides for use in controlling these species. To protect water quality, always follow herbicide label directions and obey application laws when using any herbicide.