The most familiar symbol to explain the Trinity is the Irish shamrock, (common name for any of several trifoliate clovers native to Ireland) Oxalis acetosella, with its three-lobed leaves. Shamrocks belong to the subfamily Papilionoideae, family Fabaceae (formerly Leguminosae). The white clover is classified as Trifolium repens and the hop clover as Medicago lupulina. Often cultivated to enrich the soil, the white clover grows well in sunny locations with well-drained soils.

 

The Shamrock, at one time called the "Seamroy," symbolizes the Cross and Blessed Trinity as presented by Saint Patrick. Before the Christian era it was a sacred plant of the Druids of Ireland.

Since the native Irish shamrock was made famous worldwide by Saint Patrick, the shamrock was chosen as the national emblem of Ireland. Saint Patrick used the native plant to illustrate the doctrine of the Trinity.

 

St. Patrick preached at the mouth of the River Boyne. There, Irish people gathered and heard the glad tidings of Redemption. He performed his first miracle on Irish soil to confirm the honor due to the Blessed Virgin Mary and the Divine birth of our Saviour.

Saint Patrick continued his preaching throughout Ireland despite being treated very poorly, socially and physically, by governmental Druid chieftains. On one occasion, the king of the Druids of the Irish had given anathematic orders that no sign of respect was to be extended to Saint Patrick and his companions. But at the first Druid meeting, the youthful Erc, a royal Druid page, arose to show Saint Patrick reverence; and at the second, when all the chieftains were assembled, the chief-bard Dubhtach showed the same honor to the saint. Both these daring men became fervent disciples of the Catholic faith and bright ornaments of the Irish Church. It was on this second solemn and tense occasion that Saint Patrick plucked a shamrock from a chieftain's sword to explain, in a vernacular manner, by its triple leaf and single stem, to the assembled chieftains, the Catholic doctrine of the Blessed Trinity.

Shamrocks or various representations of the plant are worn by devotees of the Blessed Trinity and Saint Patrick on Saint Patrick's Day, March 17 of each year.

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