High Leaves stress in the last week!! PLS help!

JackJollastarted grow question 3mo ago

Hi everyone! First indoor grow with autoflowers. Everything was fine until week 6, even after topping, but now in mid-flower the leaves show clear stress. I thought it was CalMag, but supplements haven’t helped. Any advice? I don’t want to lose my first harvest.

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Leaves. Too many

Leaves. Color · Yellow

Leaves. Other

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squalinoanswered grow question 3mo ago

Hey my friend, I would say it’s not a calcium deficiency, I think it’s a phosphorus (P) and potassium (K) deficiency, the two elements that the plant removes halfway through flowering to make the buds swell, and also a nutrient lockout. First, check the pH after taking it out of the jar. The pH of the irrigation water should be between 6.2 and 6.5. Unless you’re in coco, 5.8, you need to measure the pH of the water coming out from the bottom of the pot (runoff water) to see if there’s a salt buildup. And if the runoff water is good, add the PK flowering fertilizer. The affected leaves won’t turn green again, but the goal is to prevent the problem from progressing. By adjusting the pH and stopping the CalMag, the buds should be able to continue growing normally to complete the remaining 3 or 4 weeks. Have a great day!

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THcHunteR23answered grow question 3mo ago

Environmental stress? What are your growing parameters?

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Nocone_Purpleanswered grow question 3mo ago

That’s more stress than normal fade. Since calmag didn’t help, it’s probably not a deficiency. Check: your pH (if it’s off, everything locks up), your light distance (too close can stress autos), and humidity/temps autos hate sudden changes mid-flower. Also check if you accidentally increased nutrients or changed feeding that can cause shock. You’re mid-flower so the plant will still produce, but dial back any stressors now. Lower the light if it’s close, check your pH, and just feed lightly. She should bounce back if you stabilize conditions.

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JUNGLE_B4RNSanswered grow question 3mo ago

At this stage of the growth, those rust spots similar to calcium deficiency spots, are a lack of Potassium…. Your plant is moving its nutrients for the flowers. It’s a sign to increase P-K.

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Altitonans_Fulmenanswered grow question 3mo ago

Take a deep breath, AI is great for standardized answers, but unless there's a little more going on under the hood all your doing is wiping out that grow with bad advice. Root cause is oxygen depletion and resulting pH skew.

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cangrowzanswered grow question 3mo ago

Hey JackJolla, first of all, take a deep breath! Don't panic, you are definitely not going to lose your first harvest over this. Since it's mid-flower, your autoflowers are working incredibly hard to build up those buds, and what you are seeing here looks like a classic combination of nutrient lockout and possibly a minor potassium or phosphorus deficiency, which is very common during this exact stage. The reason your CalMag supplement didn't fix it is most likely a pH issue. If the pH value of your water or growing medium is off, the roots literally lock up and cannot absorb the nutrients even if they are sitting right there in the soil. Before you add any more fertilizers or supplements—which might actually worsen the problem by causing salt buildup you should absolutely check the pH of your water and, more importantly, the runoff water that comes out of the bottom of your pots after watering. For soil, you want to aim for a pH between 6.0 and 6.5. If the runoff is too low or too high, give your plants a good flush with pure, pH-regulated water to reset the medium, and then slowly introduce a balanced flowering fertilizer at half strength. Your upper leaves are telling you they need a little reset, so fix that root zone pH first and you will see things stabilize in no time. Happy Growing Growmie🌱

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