One embodiment of the present invention relates to an insertion plate disposed on an external surface of a cannabis bucking machine configured to receive cannabis plants containing stems and buds. The insertion plate includes a top surface, a first angled surface, a second angled surface, and a bottom surface. One or more additional angled surfaces may also be included. The first angled surface includes a plurality of insertion recesses and the second angled surface includes a plurality of insertion channels. The insertion recesses and channels are substantially conically shaped to function as a funnel for receiving larger cannabis bunches. The unique correspondence between the angle of the surfaces and the shape of the recesses allows feeders to efficiently insert larger cannabis bunches and continue to feed as the bunches are levered down from the insertion recesses to the insertion channels.