How to Half Double Crochet into the Back Bump (VIDEO)
Blanket stitch worked along the edge of woven fabric becomes the foundation for adding a beautifully executed decorative crochet border.
Working into the back bump (sometimes called the “third loop”) of a single crochet forces the top two loops of the single crochet forward. This creates a series of horizontal Vs along the top surface of the border. It adds a nice dimension to the fabric and closely resembles a surface chain stitch.
Here’s a video tutorial to help you get a handle on how crocheting into the back bump is done.
You can see this technique at work in the yellow row of border #21 from my book, Every Which Way Crochet Borders, below:

To create this border yourself, simply follow the instructions — or the corresponding stitch diagram — below.
Base rnd (blue row, in photo), each side: Any multiple.
Begin 2 sts to left of corner st.
Rnd 1 (green row): Ch1, sc in each st around, placing 3 sc in each corner st, join with slip st to first sc.
Rnd 2 (yellow row): Ch2 (counts as hdc), hdc in back bump of each sc around, placing 3 hdc in each corner st, join with slip st to top of ch-2. Fasten off.
Rnd 3 (outermost green row): Slip st in each hdc around, join with slip st in first slip st. Fasten off.
