Why Does Grass Turn Yellow When Covered | Top Reasons

Ever wonder why grass turns green when it is covered by a thin film of water? This article contains detailed explanations of the process of photosynthesis with some great science-based facts about grass color changing.

Why Does Grass Turn Yellow When Covered? When a plant is covered by the sun, it produces less chlorophyll. Chlorophyll absorbs the sun’s energy and helps turn water and carbon dioxide into sugars that can be used for photosynthesis. This process doesn’t work without sunlight and chlorophyll production decreases. When this happens, pigments like xanthophylls are exposed to light and will be visible.

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Why Does Grass Turn Yellow When Covered?

The grass is naturally green. When it’s in the shade, it turns yellow. This can be explained by the chlorophyll production slowing down when the grass isn’t exposed to sunlight and xanthophylls becoming visible.

Ever seen a lawn with a bright green top, only to realize that the grass beneath is brown and dead? The colors of grass are caused by two different pigments: chlorophyll in the leaves and carotenoids in the stems. When light shines on chlorophyll, it turns green and when it shines on carotenoid, turns yellow.

Grass turns green when covered because of chlorophyll. This is what makes plants grow at a faster rate and absorbs the sun’s energy. When it is uncovered, though, it also turns yellow because sunlight penetrates through the few gaps in the grass.
The chlorophyll is released and the grass starts to die.

Plants that grow in full sunlight, for example, lawn grasses, turn green when covered and yellow if uncovered because of a substance called chlorophyll. This substance is what makes plants grow and absorbs the sun’s energy which contributes to the plant’s growth.

Essentially, it protects them from the light. When uncovered, though, it also turns yellow because sunlight penetrates.

What is the Grass Colour Cycle on my Lawn?

The grass color cycle is the process by which plants change the color of their leaves from green to other colors as they grow. This change in color happens because of sunlight exposure. Plants use pigments called carotenoids that are found in their leaves and stem to absorb light, which is converted into energy by photosynthesis.


Grass turns green when it is covered in order to preserve the chlorophyll. Once the grass is uncovered, it quickly begins to decompose and turn brown.


  1. https://www.livescience.com/32496-why-is-grass-green.html

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