Ok, the actual pattern says
With first colour - chain 6, join into a ring with a slip stitch. make 16DCs into the circle hiding the tail in the DCs as you go., join with a slip stitch.
Join second colour into fastened off stitch.
3ch, make 1 treble into next 2 stitches, 3ch, ss into next stitch. repeat from 4 more times (makes 5 petals in total)
Mine ended up with 4 petals as my DCs were too bunched up and I ran out of room (very crap novice with the crochet)