Check the sunflowers heads in the late summer and early fall and wait for the back of the sunflower faces to turn down and the heads to turn yellow on the back. They are ready to pick at this point.
Cut the stem of the sunflower with the shears with about 1 foot of stem attached to the head.
Slip the head through a hanger and hang the seed head in a well-ventilated dry area free of pests.
Wrap a large piece of cheesecloth around the face of the sunflower loosely and tie it in place with twine. The seeds will drop into the cheesecloth net when they are dry.