Snowflake in US terms:
Ch5 and join to make a ring.
ROUND 1 Ch1 (counts as 1sc), 1sc, ch3, 2sc, ch3, rep from 4x more (till you have 5 loops + another ch-3), sl in initial ch-1 to join. 
ROUND 2 :: sl in the next chain loop, ch1 (counts as 1sc), 1sc, ch3, 2sc, In the next loop 2sc, ch3, 2sc, rep from around, sl in initial ch-1 to join.
ROUND 3 :: Sl in the next chain loop, 1sc, ch3, 1sc, ch5, 1sc, ch3, 1sc, ch2, rep from around, sl in initial ch-1 to join.