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Then you are going to fold them in 1/2 and then 1/2 again so the form quarter circles, and align them so that the curved edges are toward the inside.
Now, we will start stitching them together. starting from the top stitch loose stitches across the curved edge, through all four layers, ending with the needle coming up from the bottom again... this may sound a little confusing, but you want the edges of each piece to point downward when you start to gather.
Repeat this process until you have all of the petals on the thread. Then pull tight to gather them into a circle. Tie a knot and cut off JUST the knot tail, leaving the needle tail attached. Then take the 6th circle and sew the loose gathering stitches about 1/2" in from the outside of the circle.