Abstract: A harvester for removing cannabis flower from stalks includes a blade follower iris that adjusts the size of the flower-stripping opening to correspond to the diameter of the stalk. The size of the opening may be controlled by centrifugal and spring forces that cause the iris to open and close. In addition, an improved stalk-pulling belt drive conveyor system utilizes two relatively floating, releasably coupled belt systems to pinch and pull the stalk through the blade follower iris.