Usually when I ma adding a border to a quilt I just add the border along the top and the bottom and then down each side. Sometimes it’s better to mitre the corners of the quilt border to give that extra something to your quilt. It can also be particularly noticeable when a smaller project like a bag or a cushion has mitred corners for the border.
Cut the borders for a mitred border
The first point is that you will need to make the quilt borders longer than just the width of the quilt or panel. The panel shown is 10.1/2″ wide and the border is 2.1/2″ so I have cut the border strip 14.1/2″ long. That’s 10″ for the quilt block and 2″ extra each side. Find the middle of both the border and the quilt block by folding in half and pin the quilt border in place.
Sew the borders for a mitred corner
With right sides together and using a 1/4″ seam, sew the border to the top of the quilt block. Begin sewing 1/4″ from the edge of the quilt block and finish sewing 1/4″ from the edge of the quilt block. Backstitch at each end so that the stitching doesn’t come loose.
Repeat the procedure with a strip of border down the next edge of the quilt, again beginning and ending the stitching 1/4″ from the edge.
Fold the quilt or quilt block along the diagonal with right sides together. Match up the two border strips so that they are in line with each other.
Mitre the corners
Line your ruler up and along the fold line of the quilt, through the last stitch of the seam and across the border strips. Mark a line on the border strip following the line of the ruler.
Stitch along the line that you have marked, starting stitchingon on the last stitch of the seam line. Trim the excess triangle off about 1/4″ from the seam line.
There is another method of mitring the corners of your quilt borders that I have used. I don’t find it as neat a method as this one but you may find that it suits you better. Click on mitred borders.