Humidity: the wetter the better?

Humidity has a huge impact on plant growth, the guttation seen here as droplets on the tips of this leaf are a visible indication of an excessively high (night-time) humidity

There are many aspects to the environment that you can play a part in controlling. Temperature is usually always the first on people’s minds, we can feel heat so naturally it becomes quite a significant factor to us humanoids. If you hadn’t already guessed from the title of this blog, the second parameter on the hypothetical list should be humidity. The amount of water in the air doesn’t really impact people very much (other than say give us a tickly cough or make us overly sweaty) but for a plant it is a completely different kettle of fish.

Understanding your humidity means not just understanding humidity on its lonesome though. It is intricately linked to temperature and has multiple impacts on plant growth, so it takes a small amount of getting your head around to properly understand, but once you have the basics it will help you out leaps and bounds down the line.

So, what is humidity

Quite simply, it is the amount of water in the air. Strictly speaking, ‘Relative Humidity (RH)’ is what a grower measures though, and by relative we don’t mean uncle dickhead who turns up to ruin Christmas. The ‘relative’ bit is referring to temperature. The warmer the temperature of the air, the more water it can hold. What does this mean though? Well, imagine you had a sealed grow room that was 20°C, with a relative

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