Which preposition to use with cowslips

from Occurrences 2%

Cockayne would derive cowslip from cu, cow, and slyppe, lip, and cow-wheat is so nicknamed from its seed resembling wheat, but being worthless as food for man.

in Occurrences 2%

By sowing the seed of the wild cowslip in the garden, a number of varieties will be produced, some of which have flowers of a beautiful bright red colour.

on Occurrences 1%

A lover would not tread A cowslip on the head How appropriately such lines come to mind as one carefully picks one's way down a green hillside yellow with cowslips, and breathing perhaps the most delicate of all flowery fragrances.

Which preposition to use with  cowslips