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Need help light burn or defeciency

Duffy101
Duffy101started grow question 2d ago
Light is about 14 inches away but not sure if it's light burn or too much nutes or too little.started getting yellowing of Tips around 3 days ago.this is also my first grow .
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kingcrab
kingcrabanswered grow question 2d ago
Hey growmie, from the pics I’d say you’re in a pretty good spot overall. The yellow tips you’re seeing are most likely mild nutrient burn,that’s usually the first thing I look for when the rest of the plant looks this healthy and green. It’s super common, especially when plants are starting to stack flowers and demand goes up. Could also be early signs of potassium deficiency (K) but honestly, with how lush everything looks, I’d lean towards it just being a touch too hot on the feed. ✅ Here’s what I’d check: If you’re feeding strong, you could back it off just slightly,nothing drastic, even a 10–15% cut can help. Your light at 14 inches is probably fine, but if you’re running it at 100% right now, maybe dial it down to 80–90% until buds bulk up a bit more. Some strains are more sensitive than others at this stage. Double-check runoff pH and EC if you can, just to make sure you’re not creeping into lockout territory without noticing It’s not looking like a big deficiency to me yet—just looks like the plant’s right on the edge, which isn’t always a bad thing. Sometimes they grow best right there. Keep it up, this is looking solid so far 🤞🍀♥️
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John_Kramer
John_Krameranswered grow question 2d ago
3 options - if u've fed it with P lately then this yellowing is the symptoms of absorbing P (bs u had P deficiency) and that's good - if u've fed it with Ca lately (or ur water has a high ppm or u use CalMag too often or both) this is Ca excess and begining of N,K,P lockout -it could be Mg excess and Ca,P,K lockout I think it's CalMag problem bs i see a clue on 5th pic u've started overfeeding with Mg and u got Ca lock(from early weeks) then u got Ca build up and 2-nd option. THIS could work both ways for different plants SO This will'be hard to understand for u and i suggest u should just flush it and feed anew with some adjastment to ur CalMag fert and water (lower dosage or even stop using it at all for few weeks)
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m0use
m0useanswered grow question 2d ago
Yellow tips on top could be from very mild nutrient burn or beginning of K deficiency. Given how lush they look I would guess the former vs the ladder. Your light should have a manuel for some basic hang height and intensity settings. Most of they are between 12-18" at 100% for flower for the smaller units. but look yours up. and try and calculate its DLI using the PPFD maps of the light provided by the manufacture. Just know its an estimate and not fully accurate.
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