You can choose any yarn you like to crochet this flower. Just to give you an idea of the size, with cotton thread size 10 and a 2 mm crochet hook, the flower is going to be about 4,5 cm (1,8 inches) in diameter.
You will also need a needle to weave in loose ends and a pair of scissors.
Make a magic ring (or ch 6 and sl st in first ch to form a ring).
- Round 1: Ch 3 (counts as dc), dc in the ring, (ch 6, 3 dc in ring) 5 times, ch 6, dc in ring, pull the thread end to tighten the ring and join with sl st in 3rd ch of first ch3.
- Round 2: * Ch 1, skip 1 dc, in next ch-6 sp work (sc, hdc, 7 dc, hdc, sc), ch 1, skip 1 dc, sl st in next dc; repeat from * around.
Fasten off and weave in loose ends.
See a variation of this flower in Crochet Flower Urania.