English lavender tolerates Midwest humidity better than most lavandins. Its favored in cooking. Graves: This elegant dark purple variety adds graceful height to landscaping; it reaches 36 inches tall and is noted for its strong fragrance. Tips for Growing, Cooking and Decorating with Lavender | Midwest Living.
Landscape with fly-repelling plants. Flies are deterred by the scents of some plants, so keep potted plants on your patio or near your doors that repel flies: False indigo Mint Lavender Elderberry Basil
Spanish lavender (Lavandula stoechas) is characterized by its intriguing pinecone shaped flowers topped with ‘rabbit ears’. It typically grows low and wide and is one of the earliest to bloom. Native to Mediterranean areas it seems to do better than most in very hot and humid climates. I find these are more suited to the landscape or as solo plants in a container. They do not seem to play well with friends in a mixed container design since they spread so wide. ‘Otto Quast’ is a popular variety,