I was gonna say the same as mushroom brew that it looks to be a magnesium or I thought maybe calcium deficiency.
Awhile back I kept getting this same problem starting around week 2/3 and 4 of bloom and it was only after incorporating Cal-Mag into my feed that it stopped happening.
Never folar spray after 3 or 4 weeks into bloom and always keep your medium healthy using enzymes and regular flushes to leach out salts and mineral deposits.
Peace
Namaste
Why do you say to never foliar spray after 3-4wks? As long as you intermittently spray pure water nothing negative happens.
I foiliar spray heavy feeding indicas often in flower. Their nitrogen requirements can be huge. And foliar is a way to give them a quick
dose.
My view is that I dont like the thought of spraying my meds with nutes and chemicals etc directly onto what I'll consume. You may rinse some off with water but I bet not all.
Other reason I tend to not folar much other than neem oil, is that plant starts to rely on taking food in through the leaves leaving the stomata open all the time and not taking as much up through the roots. Plants evolved to feed through the roots not the leaves.
Peace
Thanks, guys. Mistakes are the best teachers, aren´t they?!
I´ve learned a lot and quite sure the next grow will be nicer.
Anyways, in 10 days, for the first time, I´ll smoke some good stuff from a plant I nurtured! Amazing!
I thought it was also just a common rule of thumb not to folar feed after 3/4 weeks into bloom. Also washing your buds in water seems crazy to me, if you didn't folar there'd be no need to.
Jorge Cervantes is my go to grow expert and on page 274 of his medical grow bible in the water and nutrients chapter, he explains folar feeding should only be used really as a quick fix to a symptom and that the foliage isn't very good at absorbing nutrients due to the waxy cuticle and cystolith hairs. Young plants have softer more permeable leaves than older plants so spraying fully mature plants in bloom you risk build up on the leaves which does stop roots from taking in more which confuses the plant.
The surface of the leaf is for photosynthesis and warding off pests and diseases.
Peace
mushroombrew;8013851 Typically you repot and then give plants at least 1 week before switching to 12/12.[/QUOTE said:I know. This is the general rule. But my experience is good and it is very easy. Try it with just one of your plants. Many people do this because it's so easy.
https://www.mandalaseeds.com/Guides/Soil-Guide
"I choose a lightweight soil mix for my plants and am worried about early yellowing. What can I do?
Repot into a larger container with the correct soil mix. You can do this up to 30 days into flowering."
Maybe it is not perfect and there are better ways. For sure there are.
But for a beginner it is a good way to start and not everybody wants to invest so much effort. I like it, because I have nothing to do than spending some plain water this and then. I simply can't do anything wrong. And it works well. And it is pure organic, or nearly.
I know. This is the general rule. But my experience is good and it is very easy. Try it with just one of your plants. Many people do this because it's so easy.
https://www.mandalaseeds.com/Guides/Soil-Guide
"I choose a lightweight soil mix for my plants and am worried about early yellowing. What can I do?
Repot into a larger container with the correct soil mix. You can do this up to 30 days into flowering."
Maybe it is not perfect and there are better ways. For sure there are.
But for a beginner it is a good way to start and not everybody wants to invest so much effort. I like it, because I have nothing to do than spending some plain water this and then. I simply can't do anything wrong. And it works well. And it is pure organic, or nearly.