Temperature Humidity and C02





"Give your plants what they want and they will thrive." An experienced market gardener once boiled down his success to this simple statement. Naturally plants cannot move, so they are at once a hostage to the environment they find themselves in. Learning to "think like a plant" is a key part of becoming a better grower.

So, how do we step into a plant's world? The first thing to do is to keep things simple-there are only four primary environmental factors that really matter to plants: light, temperature, relative humidity and carbon dioxide. Here we deal with the latter three. (Light is so important we will deal with it separately.)

Basil thriving in an ideal growing environment - warm, moderate relative humidity and sheltered
Before we start: yes... nutrients, growth promoters, additives and growing media can provide a lot of fun and these factors are also part of the picture and very interesting to play with. But if you tinker with these secondary factors at the expense of your core environmental variables, you are certainly taking your eye of the ball. If you are not managing temperature, humidity and carbon dioxide levels your plants are unable to fully exploit any nutrient goodies you send their way. So dialing in your growing environment is the equivalent of walking before you attempt to run. 

In this section we are going to take a plant's eye view of these crucial environment factors. We will also look at how these three factors are interlinked-that is, how changing one factor intrinsically alters another as a side-effect.

Thai basil leaves curling due to localized low humidity stress caused by T5 fluorescent lighting being too low

After you have understood exactly how plants respond to temperature, humidity and CO2 levels, we strongly recommend you progress directly to the next stream: Ventilation and Environmental Control - here you learn practical skills that will enable you to manipulate these environmental factors in your indoor garden so that you can truly give your plants what they want.


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PDF: Temperature, Humidity, and CO2 - Make The Link!

Temperature, humidity and carbon dioxide (CO2) levels are key factors to monitor and control in any indoor garden. But don’t make the mistake of thinking about them separately! In order to really understand how your indoor garden environment works, you need to consider how these factors work together.


Temperature, Humidity, and CO2 - Make The Link! [PDF Link]