"Blow trees" isn't a commonly used phrase with a specific meaning. It could have different interpretations depending on the context. Here are a few possibilities:

* Trees being blown down by wind: This is the most likely meaning if you're talking about weather. Strong winds can cause trees to fall over, hence "blow trees".

* Trees being blown over by an explosion: This is a less common interpretation, but if you're discussing a blast or an explosion, "blow trees" could refer to trees being destroyed by the force of the explosion.

* A slang term: It's possible "blow trees" could be a slang term in a specific community or region with a unique meaning.

To understand what "blow trees" means, you need more context. Please tell me more about where you heard the phrase or what situation it was used in.