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You can use any sturdy thread that you like, but some work better than others. Heavy embroidery floss is a good choice because it’s strong and comes in a variety of colors. However, you can also use clear fishing line, which is even stronger and won’t show up if there are any gaps in the garland.  If you don’t have any thread or fishing line on hand, you can even use dental floss to string your popcorn. In fact, using a waxed variety can make the task even easier because the kernels will easily slide along the floss.  If you’re using thread for your garland, consider using red, green, or a shade that matches the decorating scheme for the rest of the tree in case it shows in any gaps between the popcorn. If you're making a garland longer than 5 feet, it's best to leave the thread attached to the spool so it's easier to work with. However, cutting the thread in lengths of 5 feet or less makes them more manageable, and you can always connect them later by tying the ends together for longer garlands. Thin needles typically work best when you’re making a popcorn garland. Choose one with a large eye too, so it’s easier thread. Make sure to tie a knot at the end of the thread to ensure the kernels don't fall off when you begin to string them. You’ll want to push the needle directly through the center of the kernel and pull it through to the end of the thread. Continue adding popcorn until the garland is full. There shouldn't be any gaps between the pieces of popcorn, so push the kernels all the way down to keep them tightly strung on the thread as you go.  Get creative with your garlands by mixing the popcorn with other items, such as fresh cranberries, dried orange, lemon, or lime slices, and cinnamon sticks.  You can create striking patterns by alternating the other items with the popcorn. Fresh cranberries start to go bad after a couple of days, though, so you’ll want to spray the garland with shellac before putting it on the tree. You can also dress up your garland by dotting the popcorn kernels with craft glue and sprinkling colorful glitter across them. Allow the glue to dry fully before placing the popcorn string on your tree. You'll need to leave enough thread at the other end of the string so you can tie another knot to keep the popcorn in place.  If you plan to connect several shorter garlands, make sure that there is enough thread at the end of each so you can tie them together. If you're making a long garland and left the thread attached to the spool, you'll need to cut it when you finish the string. Then just tie off the end with a knot as you would with a shorter garland to secure it.
Choose your thread. Cut the thread. Thread the needle. String the popcorn. Secure the finished garland.