It is a decorative stitch worked with a single thread unlike usual
couching that uses two threads. It is a wonderful way of giving
landscape effects. Interesting patterns can be made by arranging the
positioning of the couching stitches. The neatest effect is where the
next row of couching stitches stitches are put half a stitch to the left
of the ones on the laying stitch above. This gives a diagonal effect.
Bokhara couching is worked with one thread and needle. A straight
stitch is made across the ground material and the needle and thread
re-emerge to stitch the long thread down on the return. Small, slanting
stitches are worked over the laid thread or yarn to hold it in place