This afghan is knitted on circular needles, forming a cable every six rows. I have made several of these in a variety of colors for family members and am always pleased with the result.
Basically, for seasoned knitters, with about 48 ounces of worsted weight yarn, cast on 230 stitches using size 10 1/2 circular needles, work a seed stitch for six rows and then begin knitting six stitches and purling six stitches across the row, maintaining four seed stitches on each side. Twisting a cable stitch on the knit stitches every sixth row, continue the same until desired length is reached, ending with six rows of seed stitch. Happy knitting !
The pattern book containing these directions can be purchased on amazon.com Easy Afghans - Art. J16 - #0122 - Knit and Crochet Afghans Pattern Booklet - Coats and Clark (Paperback)
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