Why are my leaves yellowing? Please help!

[JStoney]

Hello everyone, I'm really hoping someone can help me with this. I've been attempting to grow using this guide from Growweedeasy.com. ( https://www.growweedeasy.com/just-ad...y-organic-weed)

I've tried twice now and in the vegetative state everything looks great. Unfortunately about a week or two into flower my leaves slowly start turning yellow. I don't believe I'm over watering so I'm not sure what's going on.

I'm growing in a 4x4 tent, 450 watt LED, 5 gallon fabric pots with Nature's Living Soil/ fox farm on bottom 1/3 and fox farm only on top 2/3, using spring water with cal mag if needed. Flower girl is used as feed if needed. The pictures are of my last plants ( these are already beyond help I'm just trying to get an idea of what's going on.

[JStoney]

The pictures in question are also much later into flowering but yellowing starts just around same time as flowering starts

[Izzie1701]

I worried my last 2 Harvests for the same reason. Plants looked identical to yours. Was told normal not to worry. I still worried the entire time. Plants turned out great and there was nothing wrong with them. Just normal yellowing.

[OldManGrower]

You make no mention of your PH. It appears that you have several issues going on, possible nutrient burn, light burn and poor PH management. Check your PH in and out. Raise your lights. I do not know what Flower Girl is but you nutes could be part of the issue. Add more cal-mag.

[woovygroovy]

I got a question for ya buddy...why ph the water coming out? if i ph it before it goes in and it's in the right range what am i supposed to do if it comes out wrong?

[JStoney]

I was thinking light burn might be a bit of the issue, but according to the guide I really shouldn't have to worry much about nutrient burn. Plants "dip into the nutrient rich 1/3 bottom half of soil as needed. This is however the 2nd time I've been told it might be pH related. I didn't mention it because the guide also stated that spring water normally has a pH of 7. I'll start checking run off though

[OldManGrower]

woovygroovy; You check the PH of the runoff water in order to determine what PH your next watering should be. You can put in water at 6.8 PH and have runoff at 7.1. This tells you to water next time at 6.4 or some other lower value. The PH at the roots of the plant is what is important and you cannot determine this by only measuring PH in. Soil chemistry changes the PH as does built up nutrients. Once I began checking PH out, my potency and yield are way up and my plant problems have disappeared. https://www.growweedeasy.com/ph

[OldManGrower]

7 is at the very top of the range for PH. I will bet if you are watering at PH 7, your runoff will be at 7.4 which is Waaaay too high. Improper PH causes nutrient lockout so your plants are probably starving. Improper PH also results in reducing Calcium uptake. So add check the ph out. If it is really high. flush the plants with ph water at 6.8 or so and a lot of cal mag.