Ambient Indoor and Outdoor Climates - Grow room temperatures and environmental factors

Posted by Daniel Taylor on

Ambient Temperature or Ambient Climate is the surrounding temperature of your grow area ie. the outdoor weather temperature or the temperature within your home which may be affected by things such as central heating. In this blog we will look at what the different ambient temperatures are and your grow room environment factors that need to be taken into account with each climate.

Outdoor Ambient Temperatures

So let's tackle outdoor ambient temperatures first.

Hot/Arid Climates

When growing in hot/arid temperatures as we mentioned in our last blog post - Input and Output Fans - this can change the temperature of the air our intake fan is pushing into our grow space and changing the envronmental conditions. Which we do not want! Our ideal indoor grow temperature would be 22-25C or 72-77F. To stop this unwanted temperature increase we could draw air from a cooler source such as another cooler room in the house, if possible, but the likelyhood is that even the most shaded rooms will be too warm due to the ambient weather. Therefore, if this could not be done we would need to have a humidifier and air conditioner to maintain our desired growing conditions. So now we need to take into account the fact that these two elements will have an effect on our grow room environmental factors.

Hot/Humid Climates

Another outdoor temperature condition could be hot/humid so this time to combat these factors being drawn into our grown room we would require the use of an air conditioner and de-humidifier. This will enable you to maintain the perfect growing conditions for your plants and eliminate molds and other isues that may arise due to temperature and humidity fluctuations.

With both hot/dry and hot/humid situations taken into account they will both require you to have similar methods of extraction and similar effects on your extraction requirements due to the heat given off by the units whcih will differ with every unit. In summary the bigger extraction fan you can get the better as you can cover yourself with all bases, particularly with a thermostatic fan speed controller, you can dial in the perfect parameters come wind, rain or shine. 

Cold/Dry Climates

Our next climate to look at is a cold/dry climate where you would need some way of heating your grow space - safety first people, no open fires here! And again to combat the dry air the grow room would need a humidifier to maintain the desired levels of humidity needed for happy and healthy plants. As most humidifiers give off heat, this will need to be taken into account when setting up your choice of heater. The best kind of heaters and humidifiers are the ones that have digital controls as this makes set up and adjustment a piece of cake even for the novice gardener.

Cold/Humid Climates

A climate that is cold/humid like the cold/dry climate will require a way of heating your grow space but in this case will need a dehumidifier to maintain perfect conditions. As before you will need to safely heat your grow space to the desired growing temperatures and once again a dehumidifier will create additional heat within the grow space which should be taken into account. Something to note is as the temperature increases the amount of water vapour the air can hold increases so the relative humidity decreases, you may notice this when using HID lighting hence the need sometimes for humidifiers. 

Indoor Ambient Temperature

For ideal indoor growing conditions the desired indoor temperature for healthy growth is 22-25C nd the ideal humidity for most plants is; 70-90% at cutting and seeds, 50-70% in the growth phase and 40-50% during the flowering and fruiting phase. By making sure your lights are at the correct hight from your canopy top you can can keep your leaf temperature at 25C which is perfect for your plants to have a speedy growth. Using an infarred temperature reader will enable acurate readings not only of your leaf but also any unaccsesable areas in your grow space. The nighttime temperature drop can be anywhere up to 15C decrease during the growth phase and up to 5C decrease from your daytime temperature during the flowering and fruiting stage. Depending on the crops being grown the temperature should not drop more than 8C or excessive humidity, mould and pests might become a problem. Having a grow space that drops excessively in temperature when the grow lights are off can cause plants to develop internodal stretching. To combat this fluctuation try to keep your lights on and lights off temperatures within 4-5C. Remember people, plants thrive in consistent enviroments and thriving plants mean less chance of insect and disease taking a hold of your plant should the issue occur.

Native Tip

As you start to see how your grow room works, you can see how your plants react to the environmental conditions they are living in. You can then start to change things ie. temperature and humidity a little at a time and see how your plants react over a few days. Each and every plant will have its own pefect enviroment so keeping a log for temperatures and humidity is the clever way to remember what each plant you may have grown will require next time you grow it.


Consistency = Success

Products to keep your environment constant

Vortex Twin Speed Thermostatic ControllerThis thermostatic fan speed controller is a great way to manage and control your grow room environmental controls.

Grow Gadgets Heat MatUse the Grow Gadgets Heat Mat under your propagator to help germinate your seedlings and keep the temperature correct for any cuttings.

Grow Gadgets Min Max Digital Thermometer and HygrometerThe Grow Gadgets Min Max Hygrometer and Thermometer is a great way to monitor your grow room temperature and humidity simply and easily.

Dry Pots/Dry Bags These dry pots and dry bags are the perfect way to remove excess moisture from the air in your grow room.

We hope you enjoyed our latest post from our Native Growers Guide Blog Series - check out more of our blogs and we'll be working on a new post very soon. As always please feel free to contact us if you have any further environment or general growing questions.

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