What Temperature Is Too Hot For A Greenhouse And Why

The question, “What temperature is too hot for a greenhouse?” Usually is answered depending on what type of plant is inside. The ideal temperature inside of your greenhouse changes for every plant, as various plants require a different amount of temperature to strive.

Nevertheless, if you want to learn more about what temperature is too hot for a greenhouse, then just read on!

What Temperature is Too Hot for a Greenhouse

Temperature Ideal For Your Greenhouse

Have you ever wondered if greenhouses get too hot? Well, the answer to that is yes. So, what temperature is too hot for a greenhouse? The maximum temperature that plants can cope is 80 degrees Fahrenheit, and if it goes higher than that, your plants might wither.

However, there are types of plants that can withstand a whopping 90 degrees Fahrenheit! But of course, you don’t want to go too far from that as greenhouses can quickly warm itself.

Regardless, here is a list of heat-tolerant and heat-sensitive plants for your awareness:


Heat- tolerant plants

The following plants can enjoy the summer heat together with you, as they can strive even the temperature is 90 degrees Fahrenheit.

  • Eggplant
  • Okra
  • Tomatoes
  • Sweet potatoes
  • Arugula
  • Cucumbers
  • Cabbage
  • Watermelon
  • Beans
  • Chili peppers

Despite the plants having higher heat tolerance, it is unnecessary to let heat levels reach 90 degrees as it can slow down the photosynthesis of your crops.

However, they can still sprout despite the heat, making them the perfect starter plants for those new to greenhouse gardening, those who are still afraid to make their greenhouse too hot.


Heat-sensitive plants

The plants we will mention needs extra care; they can only handle temperature at around 75-78 degrees Fahrenheit.

  • Beets
  • Broccoli
  • Carrots
  • Collards
  • Cauliflower
  • Peas
  • Brussels sprouts
  • Kale
  • Onions
  • Lettuce

The following plants are sensitive when the temperature reaches 85 degrees Fahrenheit. Therefore, you’d want to lower down the temperature inside for these plants to survive.

Especially in summer, if you want the kale to add on your diet, make sure that the temperature wouldn’t go up to 85 degrees Fahrenheit.


What Causes Greenhouses To Overheat?

Aside from knowing what temperature is too hot for a greenhouse, you should also understand that there are instances where certain factors trigger your grow room to create or store more heat. Here are some reasons:


Location of your greenhouse

It might be where you place your greenhouse. You might say that “Well, that is where sunlight usually hits” I mean, it’s good that your plants get plenty of sunlight, but remember that too much of it can kill them.

Therefore, we suggest you place a thermometer inside your greenhouse to monitor the changes in temperature. You also don’t want the weather to keep changing as it disturbs your plants’ process by keeping them adjusting.

Be constant, and always remember to provide the right amount of heat, sunlight, and water for your greens to be healthy.


External environment

Adding to this, the temperature outside your greenhouse can either increase or take off the heat inside.

The greenhouse traps heat, which helps the ground inside warm-up, beneficial for your plant’s growth. In contrast, if the weather outside is too hot, you might as well turn off your heater and water your plants to regulate the heat.

Also, make sure that your greenhouse has adequate ventilation to welcome fresh air inside, as too much humidity may cause diseases to your plants.


Ways To Cool Your Greenhouse

Now that you’re full of information regarding greenhouses’ maximum temperature might as well add up how to cool it down.

There are various ways to keep your greenhouse cool, especially in summer. You don’t need to worry about your budget as some of them don’t require you to spend any cent! Read on to learn more!


Ventilation system

Sounds expensive? Well, it’s only opening your greenhouse doors or vents to let air in, simple as that!

Ventilation is the most straightforward way to cool down the grow room; it allows airflow to let heat out by allowing the air outside to go in.


Using fans

Just like us, we use fans to cool ourselves during summer. Same as a ventilation system, it allows airflow to cool down your greenhouse.

If opening your greenhouse door won’t work, then maybe it’s time for you to open your wallet and start investing in a fan.



As simple as it may sound, placing your greenhouse underneath a shade will help it cool down. Every time you hear the word “shade,” you’d automatically think of trees. Therefore, having trees with large leaves and tall canopies will help you a lot!

However, if you don’t have trees in your yard, use shade cloth and nettings as an alternative. A suitable material would be aluminet, for that doesn’t heat the inside of your greenhouse.



Watering your plants regularly just won’t cut it. Especially in summer, just like how people get dehydrated because of the lack of water or drink small ounces of water, plants will need more water to help them cope with the hot weather.

Plants sweat too! Through transpiration, they cool themselves by losing moisture. Therefore, they need to stay hydrated also!



Knowing what temperature is too hot for your greenhouse, we hope that you’d provide your plants their basic needs to strive and yield bountifully. Just be patient, and stay determined.

We hope you’d apply your learnings from this article. Thank you for reading, and we are positive that you’d read from us again!

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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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