Materials:

Yarn

Crochet hook

Abbreviations (US Terms):

ch: chain

dc: double crochet

sp: space

st: stitch

Instructions:

Chain multiples of 4, add 3

Row 1: (2 dc, ch1, 2dc) in 5th ch from hook, *skip 3 ch, (2dc, ch1, 2dc) in next; repeat from * to last 2 ch, skip 1, dc in last ch. Turn.

Row 2: ch 3 (counts as dc), *skip to next ch-1 sp, (2dc, ch1, 2dc) in sp; repeat from * to end, dc in top of ch-3 from previous row.

Repeat row 2 until desired length

Full video tutorial below: