A flower mill assembly grinds vegetation into ground vegetation. The flower mill assembly includes a container defining an opening and an interior chamber for holding vegetation before it is ground and for collecting ground vegetation after the vegetation is ground. A sifting screen is secured to the container within the interior chamber. The sifting screen allows the ground vegetation to pass therethrough while preventing the vegetation from passing therethrough. A knob covers the opening of the container to enclose the interior chamber. A rotor is secured to the knob. The rotor defines a grinding surface, a center axis, and at least one grinding channel, whereby the rotation of the rotor grinds the vegetation disposed adjacent the grinding surface and the at least one grinding channel.