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| Time Period | Tree | Celtic Name |
|---|---|---|
| December 24 - January 20 | Birch | Beth |
| January 21 - February 17 | Rowan | Luis |
| February 18 - March 17 | Ash | Nion |
| March 18 - April 14 | Alder | Fearn |
| April 15 - May 12 | Willow | Saille |
| May 13 - June 9 | Hawthorn | Huath |
| June 10 - July 7 | Oak | Duir |
| July 8 - August 4 | Holly | Tinne |
| August 5 - September 1 | Hazel | Coll |
| September 2 - September 29 | Vine | Muin |
| September 30 - October 27 | Ivy | Gort |
| October 28 - November 24 | Reed | Ngetal |
| November 25 - December 23 | Elder | Ruis |