“Marine, what makes the grass grow?” is a well-known U.S. Marine Corps cadence call-and-response where the unofficial, traditional answer is “Blood, blood, blood!”

Meaning of the phrase

The line shows up in Marine drill and running cadences as a darkly humorous way to express the Corps’ focus on toughness, sacrifice, and combat readiness. It is not a literal statement about grass, but a metaphor that equates battlefield bloodshed with what “feeds” victory and the fighting spirit.

Cultural and training context

  • The cadence is typically shouted by drill instructors or leaders, with recruits responding, as a way to build aggression, unity, and intensity during physically demanding training.
  • Phrases like this are part of a long tradition of martial chants that use stark or violent imagery to harden mindset and reinforce an identity as warriors.

Why it’s sometimes controversial

  • Outside military culture, the “blood makes the grass grow” line can sound disturbing or glorifying violence, especially when taken out of training context.
  • Some modern discussions question whether such imagery is still appropriate, while others defend it as an internal, morale-building tradition rather than a literal call to violence.

If you meant actual grass

Biologically, real grass grows through photosynthesis driven by sunlight, water, carbon dioxide, suitable soil temperature, and nutrients like nitrogen, phosphorus, and potassium in the soil. Fertilizers and proper watering support this process; blood on the ground is not a meaningful or healthy way to “make the grass grow” in real lawn care.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.