Does Cull of the Weak trigger 'when you choose' effects like Dreaming Tree?

Ruling: Cull of the Weak does not trigger Dreaming Tree or other "when you choose" effects because it does not target. Each player chooses a unit as the spell resolves, but this is not the same as choosing targets when casting the spell.

Nuances:

• Spells like Cull of the Weak, Divine Judgment, and Falling Star do not trigger "when you choose" effects because they don't declare targets when finalizing/casting
• Falling Star's reflexive triggers will target, but Dreaming Tree only triggers off spells, not abilities
• Effects that trigger on targeting (like Deflect costs) will trigger, but Dreaming Tree specifically will not