Click the links below for more information on these exotic species:

Purple Loosestrife Lythrum salicaria - Controlled in July

Garlic Mustard Alliaria petiolata - Controlled in May-June, under the oak savannas

White Sweet Clover Melilotus alba - May - July

Common Buckthorn Rhamnus cathartica - within oak savannas and on the prairie
Glossy Buckthorn Rhamnus frangula - within oak savannas and on the prairie, especially moist ground

Honeysuckle Lonicera species and cultivars