This pattern is written in US Crochet Terminology and uses standard crochet abbreviations.
Description
With centre colour make a magic loop. Work 12 dc into loop. Join with a sl st to first dc and fasten off. (12 sts)
Working in the back loops only, and with 2nd colour work 2 dc into each st. Join with a sl st and fasten off. (24 sts)
Working in the back loops only, and with 3rd colour, work (2 dc into next st, 1 dc) around. Join with a sl st and fasten off. (36 sts)
With final colour and again working in back loops only ch1 (not counted as a st), 2sc, *(hdc, ch 2, hdc) into next st, 5sc; rep from * 5 times more. (hdc, ch 2, hdc) into next st, 3sc. Join with a sl st into top of 1st sc and fasten off.
If you need a bit more help the tutorial video below may help.