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Sasha420 started grow question 4 years ago
Burnt and dots..
Potassium??
Help pls
Amnesia haze XXL autoflower
12 weeks
Amnesia haze XXL autoflower Sasha420
Amnesia XXL Auto
13 comments · 4 years ago
Resolved
Week 4
Leaves. Tips - Burnt
Removed answered grow question 4 years ago
You plant is 3 weeks old since breaking soil, in a 20 liter pot. I very much doubt it’s a deficiency, since I can go 7 to 8 weeks in 11 liter pots without deficiencies when not adding nutes. Potassium deficiency would show some chorosis (yellowing) on some part of the leaves, starting from the tip and rust or dark spots, your symptoms are not even similar. What kind of soil are you using? Those burnt tips might even be a sign that the soil is too hot or that your water salt concentration is too high. They even look similar to slight calcium overdose.

Before adding anything, get a EC / PPM pen and measure your tap water, also try to use a pH closer to 6.5; although it’s not a pH issue, you will see better results.
Kindbudz answered grow question 4 years ago
Double check the ph of your water before watering and also check your EC/TDS before watering. Anything above 150ppm on a TDS meter is pretty high and should be avoided when watering. I would say the the top browning looks like nutrient burn however since you are not adding any additional nutrients other then that provided by the soil i am curious as to what soil you are using. Check the leaves as well using a jewelers loupe and make sure that you don’t have an insect infestation as some of the light dotting looks similar to that of a spider mite infestation. Keep us updated and I will be sure to check back in on what you have found. Hope this is helpful and best of luck on your grow!
Stick answered grow question 4 years ago
Hi @Sasha420! Yes, this definitely looks like a Potassium deficiency. This happened because you gave no nutrients since the very beginning. Try to give her a good meal, she'll thank you with explosive growth! Keep us up-to-date and happy growing!