Nice piece, thanks. I also love trees. Something I noticed about the Ogham calendar is that it includes vine and cedar.  These actually aren't native to Ireland and it highlights the origins of the Celts on mainland Europe. I just thought I'd point that out as you are putting a lot of emphasis on Ireland which is of course often the place the most associated with the Celts. Although it's quite controversial, most people think the Celts originated in Central Europe.

I'm guessing the Irish Celts still would have Cedar oil and wine imported from their relatives on mainland Europe.


Ooooh, and also another tit-bit that I think you'll love if you don't know it already. Did you know that the druids used to leave messages written in ogham on the branches of yew trees?? I always think of that when I see yew trees!