Runoff
The water that drains out of a pot after watering, which growers often test to check pH and nutrient strength.
Also called leachate
Read more about Runoff
Grow guide
Cannabis pH: what the research actually says
The short answer: aim for a substrate pH of 6.5.
Leaf Doctor
Yellowing lower leaves: what it is, and when it’s nothing
Before anything else: if you're six or more weeks into flower and it's only the bottom leaves, this is probably normal.
Leaf Doctor
pH lockout: why feeding more makes it worse
A plant can be surrounded by a nutrient and unable to use it.