8 weeks and 3 days in to flower, now what is this?

Some of my plants leaf are dying from the tip of the leaves, the get all crispy and brown looking and the tip of the leaves are curling up.. it's crawling more and more over the leaves.

Now, my PH is 6,3-6,7 and the Temp of the water is 22 degrees Celsius.

The room temp is about 20-21 at night and the day its max 28 celcius.

The RH is about 30-40 %

My growing medium is earth, "Gold label". (PH 5,8. EC 1,5)

I've got 4* 600 W HPS lights with really good air flowing. Someone please help me, I've heard something about the last weeks of flowering is the most important so I dont wanna stress my plants to much.

sorry I dont have any pictures right now, my camera is bust. I found someone with similar problems in this post https://www.rollitup.org/marijuana-plant-problems/590829-leaf-curling-up-help-plz.html

Anyone got an Idea?

Pics of the leaves help man. What strain? How is the trichome development? you're around 8 weeks (64+ days) a lot of strains finish between 8 and 10 weeks, she could be getting near the end.

There is a natural fade that plants do towards the end of the cycle, leaves turn yellow, red, purple whatever but that doesn't sound like whats going on with you. 30% is low, your flower room should be between 40 - 60 % I keep mine around 45-50, but I don't know that that would harm the plants too much. Pics man and you'll get a lot more help also what is your growing medium?

Grojak said:

Pics of the leaves help man. What strain? How is the trichome development? you're around 8 weeks (64+ days) a lot of strains finish between 8 and 10 weeks, she could be getting near the end.

There is a natural fade that plants do towards the end of the cycle, leaves turn yellow, red, purple whatever but that doesn't sound like whats going on with you. 30% is low, your flower room should be between 40 - 60 % I keep mine around 45-50, but I don't know that that would harm the plants too much. Pics man and you'll get a lot more help also what is your growing medium?

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i edited my first post.

It's my first time growing so i do it in earth. "Golden label, PH 5,8. EC 1,5" I don't have a camera working right now but some of the leaves is curling upwards. Now it's just 3-4 plants of 22 that's in this condition. So i'm thinking some nut problem or something? =/ haha I'm just guessing here ..

I've got 4* 600 W HPS lights with really good air flowing.

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my 5 cents: might be a combination of fans aimed directly at the plants and evaporating so much they give up, called fan burn. mostly a combination with lamps being short on the crop and low RH, as you are experiencing (30-40%). Which gold label substrate do you use? They don't sell soil but the do sell several peat substrates

Pics would help if possible. Are they clawing up from tip to base or canoeing? U want to see some.yellowing towards he end.of flower obviously but it sounds like.a bigger problem. Post pics if u can but above me is very sound advice. Wind burn is insanely common. Couple that with a lower RH and uve got problems