The color of his vestments would depend upon the liturgical season:
Green - Ordinary Time
Violet - Advent and Lent
Red - Feast days of the Holy Spirit, the Passion of Christ and feast days of martyrs
White (or gold) - major solemnities such as Easter, All Saints and Christmas.
Green
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....
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.
Potatoes are not special on st. patricks day
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Saint patricks day
Saint patricks
Saint Patricks Day,