My DH received a partially done GFG from his grandmother years ago and I am finally getting it put together. I am making lots of black hexes, I use card stock to sew the fabric to and then whip stitch them together. Yes be careful of placements, I had a hard time undoing a seam when I sewed too many in a row. Since I am laying them on top of what was built I remove the papers and baste around the inside and outside of the circle, starch them well. Then I use the school glue and iron the ring over the flower to lock everything in place and stitch them down. I am using green diamonds to join everything. With what we were given it should be large enough for our bed. My DH remember the fabric in the flowers so it is a memory quilt which is why I have the black fabric with little white flowers surrounding the flowers.
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Which ever way you choose to do your flowers, enjoy the hand work. I find it very relaxing and am surprised how quickly it goes.