The six-module Massachusetts Qualified Tree Warden (MQTW) training course is held every other year; the next class is scheduled for Fall 2021. It is designed to educate tree wardens about what they need to know to fulfill their duties. Those who successfully complete the course receive the Massachusetts Qualified Tree Warden (MQTW) designation and certificate of achievement. Here is a list of frequently asked questions. Please email us for further information. Click here for a session-by-session course outline.