Rowan (Luis)

Rowan's berries ripen into a five-pointed red star, and across Celtic folklore the tree was planted by doorways and grave sites as a ward — not against physical danger so much as against being fooled, glamoured, led astray by something that looks harmless.

As a tree sign, your theme is sharp discernment — you tend to sense when something is off before you can explain why, and people often come to you to have their own judgment checked. The edge to watch is turning that same vigilance into suspicion of things that were never actually a threat.