High humidity problems

When vegging out a mature plant what will end up happening after awhile of being in humidity above 72%

Not to much of anything, as long as you have all kinds of good airflow going on where she is vegging, but you had better get that RH in check once you kick her over to flower!

What would start to happen with the same humidity and not enough airflow?

Benmass said:

What would start to happen with the same humidity and not enough airflow?

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Not enough air movement and high humidity is breeding grounds for mold, powdery mildew, etc. also the plants need air movement to be successful.

Besides mold would nutrient uptake become a problem?

The nutrient issues you may run into is high humidity will make your leaves pull moisture from the air which can lead to poor absorbtion rates of nutes from the soil.

Try and stick to this. I’ve found it easier said than done haha. Good luck my friend