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What is pH?

Wat
It can be very difficult near impossible to grow a healthy plant without proper understanding of pH and the tools to monitor and adjust the pH.

A must is a good digital pH meter.

I feel like this should be a sticky. A lot of beginner growers including myself treated pH as an after thought. These days I spend close to an hour carefully testing and adjusting my pH each feeding/watering and my results have improved drastically.

IMO pH issues are the root of almost every mystery problem.

Great thread.
Water temperature is very important too, which is an issue that I rarely see discussed.