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

Loosestrife, purple Lythrum salicaria - Controlled in July

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

Clover, white sweet Melilotus alba - May - July

Buckthorn, common Rhamnus cathartica - within oak savannas and on the prairie
Buckthorn, glossy Rhamnus frangula

Honeysuckle, exotic bush Lonicera species and cultivars