ALDERS
| Date | Clue |
|---|---|
| 2024-02-29 | Trees in the birch family |
| 2023-09-07 | Non-conifers that bear "cones" |
| 2020-06-30 | Birch relatives |
| 2016-02-19 | Hazel relatives |
| 2009-05-29 | Charcoal wood sources |
| 2006-07-23 | Catkin bearers |
| 2006-07-11 | Birch relatives |
| 2004-05-12 | Birch family trees |
| 2002-04-13 | Charcoal wood sources |
| 1997-12-30 | Trees with catkins |
| 1997-05-17 | Members of the birch family |
| 1995-11-12 | Thicket trees |
| 1995-09-29 | Drug-yielding plants |
| 1994-06-19 | Birch-family trees |