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Bottom fan leaves have some light green patches. Can't see anything under microscope. Just lighter color. What it can be?

Roller520
Roller520started grow question 7 months ago
Bottom - old fan leaves , some of the have light green patches and tip darkening. One of 4 plants - Banana Purple Punch from Fastbuds Auto. End of 6 week. 2 Weeks into flo. Biotabs starter pack only with water from underground. Not PH-ed as it's organic.
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Organoman
Organomananswered grow question 7 months ago
Just because it is "organic" does not mean pH is not still essential !
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