brown spots on older leaves

Ca, N, K def

Either phosphorus deficiency or ph is locking out micros. Water with plain ph neutral water and foliar spray with fish fertilizer. Cures most fertilizer issues. If that don't stop the after a few waterings then I'd try a fish/kelp fertilizer compost tea

Final answer calmag toxicity . Look it up.

Stop using Calmag.. I think you excess it.

Hi, bro! If you're noticing that your plant's branches are turning purple as well, it could be a sign of phosphorus deficiency. Bat guano is an excellent organic solution to address this issue. Good luck buddy.

Multiple deficiencies, generally under fed........phosphorous, nitrogen, potassium and not enough cal/mag either. Feed more! 1ml per litre is obviously not enough for this plant. Has been deteriorating for at least 3 weeks now, will take 3 weeks to come good again once you increase the fertilizing/feeding.

I just read through your log and I have a theory but I'm not certain. RQS soil additive is a set and forget nutrient mix, interesting, I never heard of it till now. Was looking at it a little bit, I think it may have run out of N a while back, its a 10ish week system, which would give around 2-3 weeks of veg growth planned so I am guessing they didn't pack it full of Nitrogen. Just enough to get like 3 week veg and the stretch then they probably figure N demand tapers off after that. My theory, it started running out of nitrogen a couple weeks back, 7 weeks of veg probably drained all the N out of the soil due to higher demand of larger plant in veg. Based on a quick read through your grow log: Week 3 you corrected what looked like overwatering Week 4 she looked recovered Week 5 she started looking deficient and it continued until now. I read a couple other logs using biobizz and it looks like some folks with nice looking plants a similar size to you are running 2ml/l of grow. Looks like you also just flipped to flower too, she's gonna eat herself alive trying to stretch, the demands of the plant are pretty high first couple weeks of flower. Just an FYI Usually growers try to wait until the plant is healthy before the flip. Just some closing thoughts: If it were me I'd hit it with a heavy veg nutrient feed and see if she greens up at all, if not I'd seriously consider keeping in veg until I resolve the issue. Also be sure to let her dry out a good bit between watering and feedings, but I think you figured that out already a few weeks back so I doubt its that. You said its lower/older growth which means mobile nutrients which points to: Nitrogen Phosphorus Potassium or Magnesium Either that or some micro nutrients (which are generally caused by over watering) So if you are already giving cal-mg and she isn't recovering time to up your veg nutrients. Hopefully she gets sorted for you, good luck.

Your calmag dose is a little high from a standard dose. Looks like a nitrogen deficiency but according to your diary you're giving enough nitrogen. Are you giving it every feeding? Make sure you're fully saturating the pots, you may be giving enough nutrients in your mix but if you're not giving the plants enough water, deficiencies will show.

Okay, there could be a few things going on with your cannabis plant. Let's start with the basics. Sometimes, plants get yellow spots on their leaves when they don't have enough water. If you haven't been watering it regularly, that could be the problem. Another common reason is too much or too little fertilizer. Fertilizers have nutrients plants need, but they also need to be in the right balance. Getting the wrong amount can cause those yellow spots. Also, there are diseases that can cause leaves to have spots and turn yellow. Some of these are like powdery mildew or leaf spot. They can spread pretty quickly, so keep an eye on your plant for any signs of that. Finally, pests like spider mites can cause leaves to yellow and drop off. They're tiny, so you might need a magnifying glass to see them.

Most likely your soil ph is off check the run off water and it will prob be acidic flush soil with few gallons of water ph to 6.5 reapply nutrients after running all the water thru the soil If not that then you have them to many nutrients and you probably have an idea