Grass produce more oxygen however it’s in all in details

What gives off more oxygen trees or grass? It’s not a well-known fact that a grass lawn produces oxygen for our environment at a far greater rate than the same area of trees. One acre of trees with full canopy coverage produces enough oxygen for between 8 and 18 people. The same acre in just grass cover produces enough for 70 people.

The specific oxygen production of both trees and grass varies greatly depending on:


  • Species: Different grass types have varying photosynthetic rates. Fast-growing species like Bermuda grass may produce more than slower-growing ones like Kentucky bluegrass.
  • Management: Frequent mowing removes actively photosynthesizing leaves, reducing production. Allowing grass to grow longer increases oxygen output.
  • Climate and sunlight: Warmer temperatures and ample sunlight enhance photosynthesis, leading to higher oxygen production.


  • Species: Fast-growing trees like poplars produce more oxygen than slow-growing species like oaks. Age also plays a role, with young trees photosynthesizing more actively.
  • Leaf area: Trees with larger, more numerous leaves have greater photosynthetic potential. Crown size and density are crucial factors.
  • Climate and sunlight: Similar to grass, warmer temperatures and sufficient sunlight boost oxygen production.

Studies and measurements:

  • Studies often compare oxygen production per unit area (e.g., kg/m²/year) or per individual plant. Direct comparisons are challenging due to differing growth rates and lifespans.
  • Accurately measuring oxygen production in real-world settings is complex and expensive. Estimates can vary significantly depending on methodology.

Here’s some statistical data to give you a general idea, but remember these are estimates and don’t account for all the influencing factors:

Oxygen production per unit area:

  • Grass: Estimates suggest 2-4 kg of oxygen per m² per year for actively growing grass.
  • Trees: Mature trees may produce 1-2 kg of oxygen per m² per year, but their larger canopy area can lead to higher total output.

Oxygen production per individual plant:

  • Grass: A patch of grass covering 1 m² might produce enough oxygen for a person in a day (assuming an average consumption rate).
  • Trees: A mature oak tree can release around 600 kg of oxygen per year, while a fast-growing poplar might reach 1,200 kg.

Additional points:

  • Trees not only produce oxygen but also store significant amounts of carbon dioxide in their biomass, contributing to long-term atmospheric balance.
  • Grassland ecosystems cover vast areas globally, potentially making their total oxygen production comparable to forests.

Ultimately, both trees and grass are crucial for a healthy planet, each playing unique roles in maintaining the oxygen-carbon dioxide cycle. Instead of focusing on which produces "more," it’s important to appreciate and protect both for their overall environmental contributions.

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