What Color Light Would Be The Best For Growing Plants In A Greenhouse

If you’re asking what color light would be the best for growing plants in a greenhouse, the answer is blue and red. However, it’s worth emphasizing that plants will grow well with most colors of lights, and the amount of each color will be the deciding factor. Blue and red are the best color light for growing in the greenhouse because they are close to the spectra that plants use.

Additionally, plants can also use some green and yellow. The gardener needs to ensure the proper color of grow light in the greenhouse beside the other conditions like temperatures. After all, the control you have on the greenhouse conditions is its primary advantage, regardless of location and weather. 

What Color Light Would Be The Best For Growing Plants In A Greenhouse

How To Choose What Color Light Would Be The Best For Growing Plants In A Greenhouse

When choosing a color of grow light, it’s a common mistake to choose green, yellow, and orange because we’re assuming they are similar to the spectrum given by the sun. After all, we’re mimicking the conditions that plants require for growth, right? However, studies show that photosynthetic activity of plants is in the blue and red frequencies. 

For growing plants in the greenhouse, it will be best to use red and blue lights because they take in maximum chlorophyll as a response in these colors. However, you must understand that there are different types of lights and colors that you can use in the greenhouse. While blue and red are the best colors for growing plants, a full spectrum LED grow light will be ideal for the greenhouse. 


Fluorescent lights vs. LED lights

If you use a fluorescent bulb that emits blue lights, this will help to get bushy plants. Fluorescent bulbs are also excellent when seeding because they don’t give off too much heat. It’s worth noting that when choosing a fluorescent lamp, you may choose between cool white and warm white, where the former has more blue. 

On the contrary, the more energy-efficient and long-lasting LED lights use wavelengths. This makes it easier for you to choose the actual color spectrum as opposed to fluorescent bulbs. Keeping this in mind, the following information will discuss each color and its effects on plants.  


Blue light

Before you use blue light, the emphasis is necessary on mixing it with other spectra of lamps. This color affects the leaf thickness and color, energy acceptance, and chlorophyll content, but some plant species can experience stunts in growth from this color. A minimum intensity of blue light is enough to help with growth and maturity rate and minimize plants’ water loss. 


Red light

Another influential color of light for growing plants in a greenhouse is red. This spectrum is best to combine with blue if you genuinely want to achieve well-developed plants. This is because this wavelength plays a role in the germination of seeds, flowering, and expansion of leaves and stems. 


Green light

Among the spectrum of colors, gardeners usually ignore the green light because it has the least efficiency. But according to Michigan State University, it is still useful in photosynthesis and plant structure. A green light is also helpful for the greenhouse with thick top canopies so that the lower canopy leaves still receive light.


What Is DLI?

When looking for the color of grow lights, you might encounter the term DLI. This term gives you an idea of how much light will be available to the plant to use for photosynthesis. Therefore, more DLI means more photosynthesis, equals better growth. 

In greenhouses, adding grow lights to increase the DLI will help produce quality plants. The rate of growth will depend on the productivity of the plants. However, you must also know the proper distance between the plants and your light. 

Remember that you might use fluorescent, LED, or high-intensity discharge lights depending on your greenhouse operation. If you’re using LED lights, maintain a distance of up to 30 inches above your plants. On the contrary, fluorescent lights can have a space of 6 inches above the plants, while high-intensity discharge lights can be 8 feet above the plants. 


Is Light Intensity Important For Growing Plants In A Greenhouse?

After learning the color spectra, the next step is to realize the importance of light intensity in the greenhouse. In general, the higher the intensity, the higher the rate of photosynthesis will be as well. As discussed previously, the addition of grow lights is vital because greenhouse glazing decreases the light available for photosynthesis. 



Maintaining optimum conditions in the greenhouse can be challenging. Besides the proper temperatures, do you know what color light would be the best for growing plants in a greenhouse? The direct answer would be a combination of blue and red lights because these colors are the most significant for plant growth. 

Studies have shown that these colors are close to the spectra that plants use. But while these are the best colors, a full range LED grow light will be the most beneficial for your plants. Each color has a role for the plant’s health, so learn the amount your plants will need for each color instead. 


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How To Prevent Root Rot In Hydroponics: 3 Useful Tips

If you’re a newbie gardener who’s looking to find ways to hone your skills, you’d want to learn how to prevent root rot in hydroponics even before this problem affects your plants.

Hydroponics can be advantageous to crops in more ways than one. However, it also comes with risks of diseases, such as root rot, which can be destructive or even lethal to your plants.

Unfortunately, there are no effective methods to recover the wilted parts that were affected by the root rot once it hits your plants. The only thing you can do if you do not want this catastrophe to befall your crops is to prevent it before it happens. Read on to learn more about this subject.


What is Root Rot?

Root rot is a disease that attacks the plant roots and causes them to suffer decay. This usually happens when a lack of oxygen supply occurs in the substrate.

To give you an idea, think about plant roots that are submerged in water that only has a little oxygen in it. Over time, the plant suffocates and dies.

Aside from rot and decay, this disease also leads to the proliferation of fungi that are naturally present in the soil. These include Rhizoctonia, Alternaria, Pythium, Botrytis, Fusarium, or Phytophthora. As soon as fungi colonies start to grow, they tend to target the weakened roots and infect your precious plant babies.

Once the plant becomes infected, they won’t be able to take in what they need to grow – water, oxygen, and other nutrients. When this happens, it won’t be long before the plant dies.


What is Hydroponics?

In case you’re not aware, the term hydroponic is derived from a Latin word that means “working water”. To put it simply, hydroponics is an art that involves growing various types of plants without soil. If you’re like most people, the first thing that comes to mind when somebody talks about hydroponics would be a picture of plants with roots suspended into the water without using any type of growing medium.


Avoiding Root Rot in Hydroponic Systems

Detecting and identifying root rot can be tricky. When your plants get infected, their leaves and roots gradually wither until the whole crop itself dies from the lack of nutrients, which is a common symptom of many diseases.


What causes root rot in hydroponics?

One of the requirements in hydroponics systems is oxygen. Without it, your plants are basically on the road to death. On the other hand, lack of such is one of the major triggers for root rot, and it must be avoided at all costs.

Just like when planting in soil, you loosen up the ground so that your plants’ roots can have their required intake of oxygen. That is the case for crops grown in aqueous solutions as well. If they cannot breathe, they would not be able to grow.

Another agent for root rot is the temperature. The last thing you would want in your system are parasites that leech nutrients intended for your plants and infect the water during the process. In common terms, these fungi are called molds.

One of the best breeding grounds for these is warm and moist areas. For this reason, if the water temperature inside your reservoir is high, then you are susceptible to it. Something as minor as letting the solutions exposed to sunlight can already be a risk factor.


3 Useful Tips on How to prevent root rot in hydroponics

There is good news! Root rot in hydroponics can be prevented! Just follow these tips:

Tip#1: Use the right air pump

If you do not want root rot to affect your plants, you merely have to avoid its causes. If you need oxygen, keep the water bubbling by providing an air pump of appropriate size, and also give importance to proper ventilation in the room.


Tip #2: Maintain the temperature

The temperature should be maintained within the 70 to 80 degrees F range. Get rid of any materials that can make your system vulnerable to infections, and make sure not to disturb your crops while they are trying to grow.


Tip #3: Get rid of the rotten parts

However, if you failed in preventing the disease, then the rotten parts should be removed immediately. Cut them off as there is no chance of reviving them, and focus on the potential new growth instead. Fix your hydroponics system and eliminate the risks.


Why Give Greenhouse Gardening a Try?

Greenhouse gardening offers numerous benefits to greens aficionados who dare to take their gardening experience to the next level. Aside from acting as a shield against the effects of inclement weather, a mini, hobby, or semi-pro greenhouse can also serve as a protective layer that keeps harmful bugs and critters at bay.

What’s more, its enclosed structure allows you to control your plants’ growing conditions including the temperature, light, moisture, and ventilation of the greenhouse’s internal environment. With a controlled environment, you’ll be able to extend growing seasons and grow plants that aren’t native to your area.



No matter how well-informed you are about how to prevent root rot in hydroponics, you cannot completely eradicate the risks. Therefore, to avoid the worst-case scenario, you should be prepared to sacrifice the infected for the sake of others. While you’re at it, consider trying your hand at greenhouse gardening as well.


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