A guide to nonnative invasive plants inventoried in the north by ...

Alliaria petiolata
Garlic mustard ALPE4
Form: Herbaceous biennial plant 1½ -6½ ft (.5-2 m) tall;
glabrous or with a few simple hairs. First-year plants appear
as a rosette of green leaves close to the ground, which
remain throughout the winter developing into mature plants
the following spring.
Leaves: Deltoid or cordate (lower leaves often rounded or
reniform); margins coarsely toothed.
Flowers/fruit: Flowers white. Fruit a silique (pod), 1½-2½ in.
(4-6 cm) long, 4-angled, narrowly linear with a conspicuous
midnerve.
Habitat: Moist, shaded soil on river flood plains, forests,
roadsides, forest edge, along trails, and in forest openings.
Other distinguishing features/notes: Smells of garlic when
crushed.
Notes