Shamrock Flower by jciv, via Flickr. The Shamrock "A symbol of St. Patrick and his evangelization of Ireland, and of Ireland itself, but St. Patrick used it as a symbol of the Trinity, with each leaf representing a Divine Person while the plant remains one plant.
Purple Shamrock - Best in shade as front-of-bed edging or ringing a shade shrub such as hydrangeas or rhododendrons. Also nice in a shady flower pot. Companion plants: Under Ferns, Cimicifuga or Variegated Solomon’s Seal.