In Hanakotoba†, the Lavender flower means "Faithful."
†Hanakotoba (花言葉 / はなことば / Hanakotoba) is the Japanese form of the language of flowers. In this practice plants were given codes and passwords. Physiological effects and action under the color of the flowers, put into words the impressions of nature and the presence of thorns with the height of tall plants, flowers and garlands of flowers through the various types. Meant to convey emotion and communicate directly to each other without needing the use of words. See "Hanakotoba". Wikipedia. Retrieved 2014-12-13.