Discussion:Hawthorn, also known as mayflower or may bush, is a dense, thorny shrub in the rose family. Native to northern climates, hawthorn is one of the oldest medicinal plants in Europe with a rich history. In Celtic folklore, hawthorn was believed to mend a broken heart and protect your home from evil spirits. Recent studies suggest that hawthorn may support cardiovascular function and help maintain normal, healthy blood pressure levels.