Holly is the Celtic Tree spirit for July 8 - August 4. The Holly Moon was called Tinne by the Celts. It lasts from a few weeks after the summer solstice through early August, a few days after one of the most important Celtic ritual seasonal holidays—Lughnasa.
The question I want to explore here is, why did the Celts choose the holly tree at this time of year? How can it help us, today, as a kind of “medicine” for our own calendar year?