Biological data are provided for Alliaria petiolata (M. Bieb.) Cavara and Grande (garlic mustard). This weed is found in Victoria, British Columbia, in the St. Lawrence valley of Quebec and in Southern Ontario where it attains maximum abundance in Middlesex County. It is most commonly found in shaded sites: in deciduous woodlands, under hedges and in gardens. When crushed, the aboveground parts exude a strong odor of garlic.

The vegetation at a Lesser Snow Goose breeding colony was examined to determine if particular plant species or species associations were characteristic of the nest sites of the geese. A stepwise discriminant analysis revealed that nest sites could be satisfactorily distinguished from the ambient vegetation using 2 of the 29 plant species growing in the quadrats. These two species, lyme grass (Elymus arenarius ssp. mollis) and arctic daisy (Chrysanthemum arcticum ssp. polare) were strongly associated with Snow Goose nest sites.Possible explanations for the association are examined. It is suggested that rather than a cause and effect relationship between plants and nest sites, E. arenarius and C. arcticum have similar ecological requirements to those of the geese for a nesting site.