Which preposition to use with crocuses

in Occurrences 2%

She wore a bright dress,blue, I think,and a white crocus in her hair; she had a dainty white apron tied on, "to cook in," she said, and her pink nails were powdered with flour.

at Occurrences 1%

When I see you as I saw you last, small and white and clear and brave, I can't think of anything but the first crocuses at White Orchards, shining out, demure and valiant, fearless of wind and storm and coldfearless of Fear itself.

for Occurrences 1%

Hail to the King of Bethlehem, Who weareth in his diadem The yellow crocus for the gem Of his authority!

to Occurrences 1%

As an early blossom fades, a later one takes its place through all the flowery way from crocus to aster.

Which preposition to use with  crocuses