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Starting to fade? Or nutrient deficiency?

FeebleSnane
FeebleSnanestarted grow question 23d ago
One of my plants has several fan leaves that are turning yellow/purple, and I can't tell if it's low on N or starting to fade. The plants are 2 days into week 5 of flower with a 9-10 week flower period, so it seems a little early for it to be turning colors like this.
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Week 9
Leaves. Curl up
Leaves. Color - Yellow
Leaves. Color - Dark-purple
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pHilosophy420
pHilosophy420answered grow question 22d ago
You’re in Week 5 of flower with Papaya Sherbet, and yellow/purple fan leaves this early usually point to a mild nutrient issue, not natural fade yet—especially on a 9–10 week strain. Your EC is at 1.7, pH is solid at 6.4, temps are decent (22°C day / 21°C night), and humidity is around 60%, so the environment looks pretty stable. The yellowing likely means your plant’s using up nitrogen faster than it's getting it, and the purple could be early phosphorus deficiency or just the strain showing color under stress or cooler temps. You’ve got 4 plants under an EVO3 LED in a tight 2x4 tent, so they’re probably feeding hard under that light. If buds and sugar leaves look good, no stress—just try adding a touch more N and maybe a little extra P/K for the second half of flower. Keep pH and EC steady, and you should finish strong 💪 Let me know your feeding schedule if you want help dialing it in.
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Selected By The Grower
00110001001001111O
00110001001001111Oanswered grow question 22d ago
Well, they are the same thing.. same effect from same causes, i.e. not giving as many nutes as used per increment of time. In this case looks like an N deficiency so far. possibly more, but can't see the rest very well. the purple is cold temps or genetics.
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MistaOC
MistaOCanswered grow question 22d ago
In the first image, it looks like there might be a magnesium deficiency. It could be worth considering an increase in the CalMag dosage. The other images suggest that the plants might be getting watered with an incorrect pH level.
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AestheticGenetics
AestheticGeneticsanswered grow question 23d ago
i give an mix of grow and bloom nutrients until week 4 or 5 of bloom and then cut it back for the last half of flowering. your plants still need nitrogen for the stretch
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