Green
Saint Patrick's ministry was in Ireland, and Ireland is known for its green landscape. Green is the color of Ireland (often called "The Emerald Isle"), the color of shamrocks, the official "Irish" color, as it were.
Saint Patrick's Day is March 17.
White and gold are also prominent.
Actually Blue was the original color until the clover was brought into it for the Father, Son, and the Holy Ghost....
Potatoes are not special on st. patricks day
"Fröhlicher St Patrick's Tag" is the translation, but normally when mentioning an event one uses the original phrase..
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No, they are not only the shamrock: the Father, the Son and the Holy Spirit. Must be an American thing. "Luck of the Irish" etc.