My borders are w-a-y too big for the block. I should have used the Golden Ratio rule. I’ve been trying to finish the Farm Buddies cow wallhanging. I quilted and embroidered the block and found an adorable border print that I thought would be perfect. Then, after I attached the borders, it was not right. Just one more reason for test sews!
You have a stack of 8.5-inch blocks that will finish to 8 inches once sashing is added. Multiply 8 x 1.618 and get 13. This does not mean your sashing is 13-inches wide. Divide 13 by 4 (for all four sides of the block) and you get 3.25 inches for each strip of sashing finished. Add one-half inch for seam allowances and you can cut your sashing strips up to 3.75-inches wide. That is the largest size sashing that would still look good with your blocks. This size looks particularly nice when using cornerstones with sashing.
For the smallest sashing width, take the finished size of the block (8 inches) and multiply it by it by .618 (roughly half the Golden Ratio): 8 x .618 = 5 inches. Divide 5 by 4 = 1.25 inches. Add one-half inch for seam allowances and the sashing should be 1.75-inches wide.
Your sashing can fall anywhere within these two measurements - 3.25 inches at the widest and the narrowest at 1.25-inches wide (finished) - and it will look wonderful. If sashing is wider than 3.25-inches or narrower than 1.25-inches (finished), it will look out of proportion.
Try, try again!