Cultural & Botanical Information
Irish Culture and Customs: Emblems of Ireland: The Shamrock – Learn how the shamrock became an emblem of Ireland.
Fine Gardening: The History of the Shamrock: Full of symbolism, this plant has mystical roots – Article
SFGate: Botany Difference Between Clover and Shamrock Plants – Read about the difference between the two.
Wikipedia: Shamrocks – Offers information about different aspects of the shamrock: As a cultural icon and plant species.