A washing machine appliance may include a cabinet, a tub, a wash basket, a plurality of rotatable blades, and an infuser basket. The cabinet may define an opening. The tub may be disposed within the cabinet. The wash basket may be rotatably mounted within the tub to rotate about a rotation axis. The plurality of rotatable blades may be attached to the wash basket to generate a vortex airflow within the cabinet. The infuser basket may define an infuser compartment to hold a scent additive therein. The infuser basket may further defining a plurality of slots to permit the vortex airflow to flow through the infuser compartment within the cabinet.