8 weeks into flowering.

My blackjack plant has developed some issues such as the leaves taking on a sand papery texture and some leaf tissue turning dark brown/black and the veins staying green/yellow (yellow before leaf death) and leaves curling down. I tried correcting the pH, but it didn't do much good. Should I just leave it??
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Is there good air flow in there? Could be a heat issue. Otherwise the plant looks good.

yeah, I got a pc fan directed at the top half of the plant. It's ok that the leaves have the texture of sandpaper?

Doesn't sound good, im just thinking its too hot in there. Do you know the temperature?

Check your cheap ass chinese light timer (from the wtf is this thread) Cheers bob

Nute Burn or a salt build-up causing some type of growing medium toxicity.
I would be more sure if the pic was in daylight of some type.
Feeding to high of ppms, not alternating water/feeding!
These are just a couple of possibilities~

To me it looks like a combination of the plant starting to finish up after 8 weeks of flower and a little too high of temps w/o enough water. There's no burnt tips, only fans getting yellow and droopy....like when a plant is finishing up. The rest of the vegetation is kinda droopy though, like not enough water and too hot of temps. There's my $0.02.

haha, My timer's fine but that was so true about checking the small things first. I believe it may be salt build-up, I tried flushing with twice the volume of the pot, but it didn't really work too well as in nothing happens. I checked pH of the runoff and adjusted accordingly. i'll get more pic up in better lighting.for the past few weeks ive been feeding nothing but water. How would I go about fixing if it were toxicity or salt build-up? Here is a somewhat expansive group of pictures i just took. Also the temp. is at 22C (about 72F). edit: I did a retest of the runoff and the pH is about 5.5, which could be a bit much, but i think it may indicate buildup of salts, so do I fix that by just flushing with pH adjusted water?

How long has it been flowering?
If 8 weeks not much you can do!
How are the trichomes? Milky,
clear, amber percentages?

I would say about 20-30% amber not sure on clear or milky

That looks like magnesium deficiency

Fuckbudz said:

That looks like magnesium deficiency

Click to expand...

yup....mag/cal would be your answer but it's kinda late to add. too much N earlier gave it the Nitro claw.
epsom salts at 1tsp/gal for mag def. you'll still get nice buds.