I went on the internet looking for Lavender Extract under Hechsher. I found a company called Silver Cloud Estates in Maryland, (1410 565 6600), which sells it. I called them from the UK and they gave me their customer service supervisor’s email. The supervisor replied to me that their extracts are under hechsher from Earth Kosher, which is under Rabbi Z. Blech of Monsey, whose phone number is 1845 304 7506. The hechsher is reliable according to the CRC.
Hope this helps you. B’hatzlacha!