Prepare the Twine
Cut a length of twine - for this tutorial, I used about 4" (or about 1 meter).
Tie a simple loop at one end. You will hang the garland from this loop.
Thread a heavy duty needle (like a leather stitching needle) with the open end of the twine.
Assemble the Garland
Using thoroughly dried citrus slices, poke a hole at the top center of each citrus wheel with the needle.
Pick a location several inches away from the end loop where you'd like to hang your first citrus slice. To help the citrus hang straighter, tie a knot in this place.
Then, thread the first citrus slice through the twine until you hit the knot.
Stop and tie another knot. This will place a small knot on each side of the citrus to help stabilize it.
Repeat the process by tying another knot in front of where you would like to place the next citrus slice. Thread the slice, and stop and tie another knot.
You may also add bunches of cinnamon sticks, whole cloves, or whole star anise to the garland at various intervals. Each whole spice will combine with the citrus smell to produce a heavenly scented garland to be used straight through the winter.