Does anyone know what the problem is?

Mari.baba

Active Member
Tips of leaves turning a brighter green/yellow
 

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Micronutrient deficiency. Couldn't tell you which, because I haven't had many micro deficiencies. Without looking shit up maybe Manganese or Iron. But that just a guess.

But first I'd check pH. If the pH is off they can't get the shit they want.
 
You are seeing a start of potassium deficiency.
It starts at tip - it looks like nute burn. But the symptoms will move up leaf margins and tip going necrotic.

Top dress ( dry fert ) so medium can be charged and amendments to begin to breakdown for extended feeding. You can also top dress ( fresh soil / water in ) to help “ recharge “ medium.
 
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