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Nutrient lockout

When a nutrient is present in the root zone but the plant can't take it up, often because pH is out of range.

Also called lockout

When a nutrient is present in the root zone but the plant can’t take it up, often because pH is out of range.

Leaf Doctor pH lockout: why feeding more makes it worse A plant can be surrounded by a nutrient and unable to use it. 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.