Does The Color Of Light Affect Plants Growth

Last Updated on October 29, 2022 by Cinthia

A common question asked among growers is: how does different color light affect plant growth? The answer is yes! The color of light sure has an effect on plants’ growth and we will be discussing why this is so.

Light is one crucial factor required for the optimal growth of plants. They are important for the reaction and activities that go on in your plants which are required for proper development. The color of light affects the growth of plants in many ways and we will be discussing deeper this.

How Does The Color Of Light Affect Plant Growth
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Why Do Roses Change Color?

The light that your grow light emits comes in a different spectrum for the use of your plants’ growth. The color of grow light you supply your plant will not only have an effect on your plant, but it will also determine the result of your plants’ development.

The process of photosynthesis where plants make their food requires the use of light. Also, chlorophyll is responsible for the green pigmentation of leaves and stems. Chlorophyll requires light to transform carbon dioxide into food and this is done by the energy from light.

How Does The Color Of Light Affect Plant Growth

Some Important Color Of Light Used By Plants

Blue, red, green, yellow, and a couple of other light colors are essential in the plants’ life cycle. Let’s take a look at some of this color of light and see how they affect the growth of your plant:

Blue Light

Blue light has a short wavelength and high energy in the color spectrum which makes them easy to absorb by plants. They are very important for the early plant stage such as seedlings and some seeds may not germinate if this blue light is absent. This is the light to be used when your plants are beginning to sprout.

Blue light is easily assimilated by plants which they convert to energy to attain maturity faster. A blue light will also enhance the quantity of chlorophyll that is produced by your plant.

Red Light

Red light has a long wavelength therefore their energy level is not so great for plants. Now, red light is usually very effective on plants when combined with other light colors such as blue light. The combination is ideal for matured plants such as the flowering phase.

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Red & Blue Light Combination

The red and blue light are a great combination and they are needed as your plant matures. They are especially required for both the vegetative and flowering stages. This red and blue light enhances the production of more leaves and crops.

Violet Or Purple Light

Violet light or purple light is an additional light that your plant will benefit from. These colors have the shortest wavelength and high energy which enables the plant to be able to absorb them well. The light energy in violet color results in sweet aroma, great plant color, flavor booster in vegetables and fruits.

Therefore, you can use this light at any stage of a plant to boost the color and improve your plants’ taste. Violet light will also enhance the number of antioxidants accommodated in a plant.


The effect of green light on plant growth is not so much. The reason being that most plants are already green in color thus will reflect green rather than absorb them.

Yellow Light

Yellow light does not have much effect on the growth of a plant. They are just like green lights which are difficult for plants to absorb.

Ultraviolet Light

Ultraviolet light is known to be harmful to humans. So, just as ultraviolet light is harmful to humans, high exposure is also bad for plants. Your plants will develop with little exposure to ultraviolet light.

Best Color For Plants That Will Affect Their Growth

Having mentioned most of the colors your grow light will produce; now we are wondering what the best color that will affect the growth of plants?

The best and most important colors for the development of your plant are the red and blue light colors. Blue light is ideal for the early plant stage such as seedlings. As your plant matures, the red and blue light colors are combinations excellent for your plants’ growth.

Best Color For Plants That Will Affect Their Growth


How does the color of light affect plant growth?

The most important factor in determining plant growth is sunlight. Plants need light to grow. However, the quality of light that they receive has a huge impact on their growth. Light is made up of electromagnetic radiation. The wavelength or color of light determines the color of light. For example, red light (in the visible spectrum) is longer than blue light (in the visible spectrum), which is why many plants absorb it in heaps.

The color of light affects all life on Earth. Light is composed of electromagnetic radiation, including visible light, ultraviolet light, and infrared light. These wavelengths of light are absorbed by plant chlorophyll, which helps plants process sunlight and produce energy. When light is in the blue-green range, it is called blue light. When light is in the red-orange range, it is called red light. When light is in the green range, it is called green light.

When light is in the yellow-orange range, it is called yellow light. When light is in the violet range, it is called violet light.

How does color of light affect photosynthesis?

Color of light affects photosynthesis in a plant. Green and red light stimulate the plant to grow more. Blue light stimulates the plant to grow less. If the plant is not exposed to blue light, it will grow more than if it is exposed to blue light.

What color of light is most effective for plant growth?

The answer to this question depends on the type of plant and its position in the light spectrum. Plants use light to manufacture energy from the sun's rays, and they use light to make the food they need for survival. The light color that a plant needs is determined by its specific needs for growth and development.

Which plant uses blue light to grow more?

The answer is the plant fern. The plant fern is a small green plant that grows in moist soil. It is very similar to a plant called moss.

What color light is best for germination?

You can use any type of high intensity lighting you want, but the light spectrum emitted by your bulbs matters.

High-pressure sodium bulbs emit more blue light than other types of bulbs. This makes them effective at germination but not so good for later development. Halogen bulbs emit a lot of red and yellow light, which is useful for later growth but may not be effective for germination.

Does The Color Of Light Effect Plant Growth Final Say

The colors of light contribute a lot during different growth stages in a plant’s life cycle. Light colors will also increase help the yield of your crop production in many ways. Matter of fact, the absence of light means the absence of vegetative or floral plants.

Therefore, we have concluded that the color of light does affect plant growth.