From Franchi's 1928 Seed Catalog

AGERATO, FLOSS FLOWER OR BLUEMINK

An elegant annual plant, easy to grow and approximately 20 cm tall, that offers a touch of refined class. The splendid intense blue blooms are ideal for creating refined bursts of color in borders and pathways. They prefer full sun and flower long into the season, effortlessly providing elegance and color for those who desire it.