Hagalaz: (H: Hail.) Wrath of nature, destructive, uncontrolled forces, especially the weather, or within the unconscious. Tempering, testing, trial. Controlled crisis, leading to completion, inner harmony. Hagalaz Merkstave (Hagalaz cannot be reversed, but may lie in opposition): Natural disaster, catastrophe. Stagnation, loss of power. Pain, loss, suffering, hardship, sickness, crisis.
Hagalaz stands for hailstone. Metaphorically it symbolizes uncontrolled forces of nature coming your way. If you came upon Hagalaz, it is the perfect time to stop trying to control everything in you life. Can you see the challenges, that mother Nature has up in her sleeve especially for you?
Hagalaz is the rune of testing, cleansing, the rune of your unconscious speaking out loud. It has no reverse meaning (as most of the runes do), because you can’t reverse the hailstorm.
The tree for Hagalaz is yew.