Celebrate Dandelion Day with a ‘Lion’s Tooth Tequila Smoothie’ Every April 5 th is National Dandelion Day. Most people consider the dandelion as a nuisance weed that litters the yard. But it has many health benefits and is a good source of vitamin A, C, iron, calcium, and potassium. Every part of the dandelion is edible – leaves, roots, stems, and flowers. It can also: Filter the liver Joint pain Dandelion's common name derives from the leaves' jagged appearance. The French called it ‘dent de lion,’ or "lion's tooth." Can the dandelion predict the weather? According to, In Camping for Boys by H. W. Gibson;