UK / US crochet term:

Chain stitch – ch

Double crochet / Single crochet – dc / sc

Half treble / Half double crochet – h.tr / h.dc

Double treble / Treble – d.tr / tr

Shell: work 7 d.tr / tr in the same stitch

Front Post dc /sc - FPdc/sc

Foundation Chain: Multiples of 8 + 2

Row 1: 1 ch skip, * 1 dc/sc in next, 3 ch skip, shell in next ch, 3 ch skip; rep from*, 1 dc/sc in last ch, turn.

Row 2: 3 ch, * 5FPdc/sc over 5 middle d.tr/tr of shell, 3 ch; rep from*, 1ch, 1 h.tr/h.dc in dc/sc below, turn.

Row 3: 4ch, 3 d. tr/tr in foundation ch (see pictures below),

* 1 dc/sc in middle FPdc/sc, shell in foundation ch ; rep from*, 1 dc/sc in middle FPdc/sc, 4 d.tr/tr in last foundation ch, turn.

Row 4: 1 ch, 1 dc/sc in d.tr/tr below, 2FPdc/sc, * 3 ch, 5FPdc/sc over 5 middle d.tr/tr of shell, rep from*, 3 ch, 2FPdc/sc, 1dc/sc in ch, turn.

Row 5: 1 ch , 1 dc/sc in dc/sc below,* 2 rows skip and work shell in middle FPdc/sc, 1 dc/sc in middle FPdc/sc of previous row; rep from*,

at the end of row work 1 dc/sc in dc/sc below, turn.

Row 6: 3 ch, * 5FPdc/sc over 5 middle d.tr/tr of shell, 3 ch; rep from*, 1ch, 1 h.tr/h.dc in ch, turn.

Row 7: 4ch, 2 rows skip, 3 d. tr/tr in dc/sc below , * 1 dc/sc in middle FPdc/sc, 2 rows skip, work shell in middle FPdc/sc; rep from*, 1 dc/sc in middle FPdc/sc, 2 rows skip, 4 d.tr/tr in dc/sc below, turn.

Repeat 4 – 7 rows until you have reached your desired length.