St Columba's Day, Scotland

The luckiest day of the year in Highland Scotland, especially when it falls on a Thursday.

Day of Colum Cille the beloved
Day to put the loom to use
Day to put sheep to pasture
Day to put coracle on the sea
Day to bear, day to die'
Day to make prayer efficacious
Day of my beloved, the Thursday. 
Carmina Gadelica

St Columba's herb is St John's Wort which flowers around now in the Northern Hemisphere; if found accidentally and kept beneath the armpit (where the saint is said to have worn it) this will ward off all kinds of evil. Say this charm when you pick it:

Arm-pit package of Columba the kindly
Unsought by me, unlocked for
I shall not be carried away in my sleep
Neither shall I be pierced with iron
Better the reward of its virtues
Than a herd of white cattle.

Hypericum, or St John's Wort, is one of the few medicinal herbs to receive full validation of efficacy by Western Science. It is effective in cases of depression and anxiety.