(Pay attention to the things marked in turquoise. The corners change a little every round, so I marked it to make sure you picked up on that)
Ch 4, join w/ a sl st to form a ring.
Round 1: Ch 2 (does not count as a stitch) do 15 dc in ring. Join w/ sl st to first dc.
Round 2: Ch 3 (Beginning chain counts as stitch here and for the rest of the pattern), do 1dc in same stitch, ch 1, do 2 dc in same stitch, do 1dc in each of the next 4 sts, *2dc, ch1, 2dc in next stitch, do 1dc in each of the next 4 sts.* Repeat from *to* until you reach the initial ch3. Join with a sl st.
Round 3: Ch 2, do 1hdc in next st. *2 dc, ch 2, 2dc in ch1 space, 1hdc in next 2 sts, 1sc in next 4sts, 1hdc in next 2sts*. Repeat from *to* until you have 4 sts left. work 1sc in each of those 4 sts. Join with a sl st.
Round 4: Ch 3, dc in next 3 sts, 3dc, ch2, 3dc in ch2 space, *dc in next 12 sts, 3dc, ch2, 3dc in ch2 space* Repeat from *to* until you have 8 sts left. Work 1dc in next 8 sts, join with a sl st. Finish off.
To join into a garland, sc in each stitch along the top of each triangle and chain what you wish in between each motif.