Week 5, yellow leaves looking for suggestions

[Kust]

Checking the runoff if you can will help. I apologize to you kust for the way I handled myself and that is not the type of person I am.
Could you tell me the soil your using is it the all mix or the light mix. I don’t see an auto at 5weeks exhausting the all mix that fast. If you used the light mix That’s probably where your issue is with not enough energy in your pot. Your nutrients are probably still in the pot locked up due to ph issue if you used the all mix . Check the runoff when you can at your earliest convenience. Collecting runoff can be a pain but it will give you an idea of your next step.

I'm using the All Mix!

 

[Kust]

You now have a lockout of some sort.

You can cause all sorts of issues with flushing.

You cannot fix a pH issue of any sort by running excess water thru soil. You can do that in a soil-less medium but you're growing in soil.

I just went thru an issue with my grow. I moved to a new home and the water pH was WAY high like 9pH - I never tested my water pH and didn't have a pH pen. I had a "feeling" my pH in the water was off so I hooked up a RO water filter that is supposed to give me water with a 6.5pH or very close. So thought I'm good.

I was still getting the same issue (similar to yours - leaf necrosis = brown spots). It didn't slow down with the RO filter. So I got a pH pen and tested my RO water and sure enough I still had 9pH water out of the RO filter (well water) with 10 ppm. I started adjusting the water to less than 7pH and the plants stopped showing those signs.

When plants show you they are not happy. Trouble shooting is key. But I like to react based on knowledge. So how do I find the knowledge??

There's a lot of myths in the cannabis growing world. These myths have been passed along for generations based on anecdotal evidence at best. "Flushing" is one of them as is "defoil" and "topping" the list goes on.

When you trouble shoot, look at the plant as a whole not just a few leaves. When things go south most of the time the problem is something I am doing not something wrong with the plant (other than genetics).

Brown spots/ leaf necrosis like you have are troublesome for me as this is a sign the plant is not getting proper nutrients. A few leaves I generally dont do anything other than keep a closer eye out.
IF it continues then I start looking at what I'm doing. The fewer things I do to the plant the easier it is to trouble shoot.

In my case I water and IPM (integrated pest management) and thats all. So 1 of those 2 things I was doing was hurting the plant. So I started looking at what I was doing and it had to be water and or IPM. Easy enough, stop IPM and watch and see. Sure enough the plants were still struggling. So the a-hah moment, its the water. Tested with a pH pen and bam pH was way high. Adjust the water and wait and see.....

Issues with plants take a bit of time to happen and a bit of time to fix. Time is our friend in this regard.

Change 1 thing at a time.... wait and see.

To get back to your issue in hand. Flushing likely compounded your issue. I would get EWC (earth worm castings) and kelp meal and make put a cup of them in a bucket of water let it sit overnight and use that to water in. No nutrients. @Emilya likes to use Recharge which is basically microbes packaged similar to the kelp/ewc tea I use/recomend. This will help with the root zone issues.

You need to let the soil dry out quite a bit after your flush. Soil that is waterlogged can also cause issues like you're seeing. But the result is the same whatever the reason. The roots are not getting the proper nutrition.

Thank you for the feedback, but still I'm afraid that we've given too much attention to a flushing happened 2/3 days ago, when the plant was already affected by the problem. I understand this didn't help and for sure I'll give a while to the soil to dry out a bit, but I still think that nutrients are the key. I don't want to have the plan cannibalizing itself because of it as @Emilya said. Every time I check I see something new like purple stems and this also let me think that I have to act quickly. I will check online how fast I can get also the EWC but it could take days I'm afraid...

 

[KingJoe83]

Generally speaking you dont really need nitrogen in flower. N is already stored in the leaves.

For your fertilizer regimen follow direction on the label regarding pH requirements.

I dont use fertilizers but know enough to say 7 pH is likely too high for most fertilizers. Dropping it to 6pH is good but again check your label directions.

That said. Your plants look pretty healthy. Looks like you may have spilled water with fertilizer on the leaves. That will cause what you see there. Also pH too high will do that as well but all plants will be affected the same.

If you need to move leaves away from the soil to water. Remove a few leaves specially leaves touching the soil. So you can water without spilling on plants.

6.3-6 .5 Bob knows his stuff man