The Union Square quilt block also goes by the names of Four Crowns and Union Block. It’s classified as a nine patch block and I’ve made it here as an 18″ square.
Cutting requirements for the union square quilt block
3.1/2″ squares: four white, eight blue
3.7/8″ squares: twelve blue, twelve white
Making the half square triangle units
First you need to make half square triangles with the 3,7.8″ squares. Place a blue and a white square with right sides together and mark a line along the diagonal. Sew a 1/4″ seam either side of the marked line and cut along the line. This will produce two half square triangle units which are now 3.1/2″ squares. Press the seam allowance towards the blue and trim the two corners where the fabric sticks out.
Making the union square quilt block
I’ve shown the layout with the plain squares first to make it more easy to see where everything goes. There’s a white square in each corner, four blue squares in the middle and one blue square on each corner of the central area.
The half square triangle units are placed everywhere else. On each edge of the central area there is a pair of half square triangles, placed so that the two white triangles together form a larger white triangle pointing outwards.
Between each pair of corner squares there are two pairs of half square triangles. These are placed so that in the middle of each edge two white triangles together form a larger white triangle pointing towards the middle.
Sew the squares together across each row and then sew the rows to each other to complete the Union Square quilt block.
For quilt ideas I have shown first a basic layout with nine blocks sewn together in three rows of three. This makes quite an interesting quilt.
In order to add a bit of pop to the quilt, I tried it with a red border and the white squares in the corner of each block replaced with red squares.
Here’s the video:
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