Worsted Weight Cotton yarn and an H hook. Or whatever size you like ;o)
Rnd 1) ch3, 12dc in 3rd ch from hook, sl st to top of first dc, 12dc
Rnd 2) ch2, 2dc in each st around, 24dc
Rnd 3) ch1, * sc in first st, skip next st, 6dc in next st, skip next st, repeat from * around. 6 petals and 6 sc
Fasten off and weave in end.