border problem..
 

I have problem with my border..I measured from the middle and cut my border to that size, it is now too long for the side.. I think that the problem is that the center of the quilt is a radiant star and maybe it stretched on the bias.... So do I go with the middle measurement of the side???

After squaring up top. I would measure both sides and the middle, add three numbers together than divide by three to get the average use this number for border length. Good luck, hope this helps you.

Hard luck , at least it is too long rather than short so you can cut it down.
I agree with Gramie Bj .

square up the quilt top before adding your borders.

Don't do what I did. I put the long borders on the sides and it was extremely wavy on the edges. Then, stupidly, I thought I could quilt it flat. Well it didn't work. And I had to make darts in the borders to deal with the problem. So, in my opinion, cut the borders the side measurement (average).

I would go with the middle measurement, cutting the border to that size. Measure to find the midpoint of both the top and the border and pin there. Then pin at both ends and ease the rest of the quilt onto the border's length by pinning generously. It helps if you can do this on a large, flat surface. This allows you to distribute the bit of extra length in the quilt top evenly along the length of the border strip.

it may be best if you "block" your quilt top first since it is wavy. spritz it wet if necessary and pin to the rug or how ever you can get it to stay in place after making sure it's straight. each end should measure the same width or length. then measure for your borders and match centers and ends and pin, pin, pin. then stitch on. Good luck!

You have to be very careful with the amount of the difference. If is greater than an inch, what might happen is that the quilt top will poof up in the corner because of the tightness of the border. Having professionally quilted for others. I have seen it all. Not a pretty sight. If there is that fullness, try carefully to spread out the fullness evenly thru-out the entire length of the border.

I just found this http://www.threadbearquilting.com/wavyborders.shtml

I think that my star in the center has too much fullness and thus makes my ends shorter...when piecing I remember laughing and saying that is looked like a little bra..haha

I think most of the suggestions you have received are for dealing with the opposite issue. If your edges are too long because they have stretched, then a shorter border and careful pinning/easing can often correct it. But if your center is too big, then your quilt is going to puff up in the middle. Definitely don't cut your border to this size, because you'll just compound the issue. I would go with cutting the borders the length of the edges (average the two edges, just to try to keep it somewhat square). But you are going to have a serious challenge to get the center to quilt flat.

If you are willing to do some disassembly to correct the root problem and make the center of the star lie flat, then you will get a much better result that way. What I suspect has happened (because it happened to me on one of my early star quilts) is not that your star stretched (although that may be part of it). I think that your diamonds were not true 45 degree points when you assembled the 8 star points. And then when you joined them in pairs, they were not 90 degree square. I would take apart the center of the star into the 4 quadrants that you assembled. Carefully lay a square ruler on the center point of each segement, and trim it to 90 degrees. Then re-assemble the top. You could possibly do this without disassembling the y-seams and setting squares/triangles if you are careful (so you have a star with an open center while you trim. Then resew the partial seams to put it all back together.