Flower mill assembly

A flower mill for grinding vegetation into ground vegetation, said flower mill comprising:

• 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 secured to said container within said interior chamber, said sifting screen allowing the ground vegetation to pass therethrough while preventing the vegetation from passing therethrough;
• a center rod fixedly secured to said sifting screen, said center rod extending through a portion of said interior chamber toward the opening of said container;
• a knob for covering said opening of said container to close said interior chamber, said knob including a central boss for receiving said center rod therein;
• a rotor secured to said knob, said rotor defining a grinding surface, a center axis, and at least one grinding channel cut into said grinding surface, whereby rotation of said rotor grinds the vegetation disposed adjacent said grinding surface and said at least one grinding channel;
• and
• a retainer disposed within said central boss for securing said knob to said container and said retainer includes at least one magnet, wherein said retainer is configured such that said center rod and said retainer do not contact when the knob is in a closed position.