I just had to tat this one again. Both the white and blue are Flora size 20. While Flora is just about my favorite thread, the #20 white was difficult with this pattern. There are so many chains that need uniform stitches. I found myself struggling and pulling out some trying to make it look nice. I also put one extra petal on the bottom flower, but I won't tell if you don't! By the time I saw it, I was disinclined to fix it!