This stitch confused me no end. I think it was the work 'knotted' in the title that put me off. I knew 'Loop Stitch' but thought 'Knotted Loop Stitch' was a different one. I had about eight goes at the stitch, trying to make it too difficult. Once I got over that and realised it was the stitch I called 'Loop Stitch' things progressed.
I'm not sure that I like this stitch. It is good for skeletons of fish, seaweed, barbed wire, leaves and maybe small trees. I again found the wool the best for the free form stitching but must say that the rayon thread behaved a lot better than I thought it would. It really wasn't keen on the thing stranded cotton although I could see uses for this.