-
Happy Birthday ICMag! Been 20 years since Gypsy Nirvana created the forum! We are celebrating with a 4/20 Giveaway and by launching a new Patreon tier called "420club". You can read more here.
-
Important notice: ICMag's T.O.U. has been updated. Please review it here. For your convenience, it is also available in the main forum menu, under 'Quick Links"!
Yellowing mid flowering
- Thread starter solista
- Start date
Magnesium deficiency. See how the leaf veins stay darker green. You can really see it on the lower leaves. And stems get reddish in color
Nitrogen deficiency. Because there is also an overall light color.
You probably have a pH issue. Make a 1/4 strength nutrient solution. Use any "grow" fertilizer. Shit even miracle grow if your broke.
Then you need to adjust the pH. You're going to need a way to check pH. Test strips, drops or a pH pen?
Then use pH down to adjust the solution to 6.5. Pour three times the volume of the pot into pot. So a 2 gallon pot needs 6 gallons solution ok?
You will be flushing the salts out.
And doing a mild feeding at the same time.
The next watering go ahead and feed it full strength.
It will be a week before it needs more water.
The flush will super saturate the soil.
Dilute the original solution down to 1/8th strength to foliar feed. Use a sprayer with a fine mist. Spray the shit out of her. All over even under leaves. Twice, three times a day go for it.
Spray her for a few days. You will be feeding her through her leaves instead of roots.
After a couple days you may see salt build up on her leaves. She doesn't like that. Its like when you swim in the ocean. You get out and your all salty right? So you take a freshwater shower right?
OK so she's going to want a rinse every couple days too.
The leaves won't get better or worse. But she will grow some new bud leaves and they should be greener.
Ok get to work. Good Luck!
Nitrogen deficiency. Because there is also an overall light color.
You probably have a pH issue. Make a 1/4 strength nutrient solution. Use any "grow" fertilizer. Shit even miracle grow if your broke.
Then you need to adjust the pH. You're going to need a way to check pH. Test strips, drops or a pH pen?
Then use pH down to adjust the solution to 6.5. Pour three times the volume of the pot into pot. So a 2 gallon pot needs 6 gallons solution ok?
You will be flushing the salts out.
And doing a mild feeding at the same time.
The next watering go ahead and feed it full strength.
It will be a week before it needs more water.
The flush will super saturate the soil.
Dilute the original solution down to 1/8th strength to foliar feed. Use a sprayer with a fine mist. Spray the shit out of her. All over even under leaves. Twice, three times a day go for it.
Spray her for a few days. You will be feeding her through her leaves instead of roots.
After a couple days you may see salt build up on her leaves. She doesn't like that. Its like when you swim in the ocean. You get out and your all salty right? So you take a freshwater shower right?
OK so she's going to want a rinse every couple days too.
The leaves won't get better or worse. But she will grow some new bud leaves and they should be greener.
Ok get to work. Good Luck!
Wow! Thanks for the prompt and ample answer!
My concern about Mg foliar spraying is the future´s buds taste. I´m growing organic.
A few hours ago I applied a 3 days old worm castings and bat guano tea. I´ve had done a flush before but due compact soil it stays quite wet for a long time. And at this point of flowering I won´t mess if this rocky soil.
Yes, I had PH problems because a crappy PH meter. By now soil is at 7.0. I´ll try to lower it with fresh coffee grounds.
Cheers,
My concern about Mg foliar spraying is the future´s buds taste. I´m growing organic.
A few hours ago I applied a 3 days old worm castings and bat guano tea. I´ve had done a flush before but due compact soil it stays quite wet for a long time. And at this point of flowering I won´t mess if this rocky soil.
Yes, I had PH problems because a crappy PH meter. By now soil is at 7.0. I´ll try to lower it with fresh coffee grounds.
Cheers,
You don't have to spray mag specifically. Flushing with mild fert at 6.5 is the answer. Use lemon juice maybe? Coffee grounds will take too long I think.
Don't worry about residual ferts/flavor. Your plant is shutting down. So foliar feed her.
If you don't your terps will be shit. And you'll have bad tasting herb anyway.
Don't worry about residual ferts/flavor. Your plant is shutting down. So foliar feed her.
If you don't your terps will be shit. And you'll have bad tasting herb anyway.
Attachments
jedi5891
Active member
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
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.
jedi5891
Active member
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
No, they evolved to do both. I've never heard of plants favouring foliar applications over root, especially as not all nutrients transfer through stomata or epidermis efficiently.
Try adding more perlite or an available aeration amendment to your soil next round. Too much organic matter in a soil and heavy topdressing of fine particulate will raise bulk density to an unhealthy level (high water holding capacity and low gas exchange).
Try adding more perlite or an available aeration amendment to your soil next round. Too much organic matter in a soil and heavy topdressing of fine particulate will raise bulk density to an unhealthy level (high water holding capacity and low gas exchange).
I always rinse buds in water at harvest. But I hear you and your concerns. ppm's sould be real low on foliar.
Foliar feefing is necessary when roots are damaged or pH is off. As in the plant above.
Its not black and white.You can wait for roots to recover
But If you foliar feed you keep the plant growing.
jedi5891
Active member
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
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
jedi5891
Active member
Yeah your right mistakes are the best teachers so embrace them as they'll make you a better grower.
If I had any advice for a newish grower it would be that environment is the most important factor, then genetics. Also dont over look how important the difference between the day time and night time temps are, there wants to be about a 10 degree difference. Makes a huge impact on the stretch.
Peace
coconutcurry
High
It is quite difficult to find the reason for yellowing leafes. Of cause it is any deficiency, but what exactly, in which amounts and why, is difficult to say. Are there really too less nutrients in soil, or is there any reason the plant just can't take it?
Often roots are damaged or insufficient. PH values are wrong or maybe all reasons together.
I found the most easy way for me to avoid yellow leaves is to repot my plants between day 14 and 21 after switching to 12/12, The Plants start stretching now and prefowers start growing. The roots are also still growing a while.
This is also the time short before yellowing starts. One reason for the yellowing leaves is also the very high need for nutrients of the plants during flowering. If the roots are just too small for the big buds of our highly breeded weed,the leaves start yellowing.
The new pot should have about double size. I repot from 10 Liter to 20 Liter.
New fresh quality soil got sufficient food for about three or four more weeks and the right PH value and - very important - space for the roots to grow. The bigger the roots, the moore food they can take.
If the plant gets repotted three weeks after 12/12, new fresh soil means the plant has at least enough food until week 6, maybe even week 7. No fertilizer is necessary until this point.
An Indica is done in 8 or 9 weeks, maybe even faster. One may feed an indica a bit 6th and 7th week. That is all. And even if the plants will yellow after four weeks in new soil, it will be arround four weeks later.
It is very easy and convenient to grow this style. Just use good, well known quality soil and plain water.
When I repot my plants that late, flowering often delays a bit. Flowers may take some days longer, but will be fatter.
I would also have repotted at day 33 when my plants would yellow, even if it is generally too late, but it would have been worth a try. Now it's too late for that. Your plants should be about day 43.
Often roots are damaged or insufficient. PH values are wrong or maybe all reasons together.
I found the most easy way for me to avoid yellow leaves is to repot my plants between day 14 and 21 after switching to 12/12, The Plants start stretching now and prefowers start growing. The roots are also still growing a while.
This is also the time short before yellowing starts. One reason for the yellowing leaves is also the very high need for nutrients of the plants during flowering. If the roots are just too small for the big buds of our highly breeded weed,the leaves start yellowing.
The new pot should have about double size. I repot from 10 Liter to 20 Liter.
New fresh quality soil got sufficient food for about three or four more weeks and the right PH value and - very important - space for the roots to grow. The bigger the roots, the moore food they can take.
If the plant gets repotted three weeks after 12/12, new fresh soil means the plant has at least enough food until week 6, maybe even week 7. No fertilizer is necessary until this point.
An Indica is done in 8 or 9 weeks, maybe even faster. One may feed an indica a bit 6th and 7th week. That is all. And even if the plants will yellow after four weeks in new soil, it will be arround four weeks later.
It is very easy and convenient to grow this style. Just use good, well known quality soil and plain water.
When I repot my plants that late, flowering often delays a bit. Flowers may take some days longer, but will be fatter.
I would also have repotted at day 33 when my plants would yellow, even if it is generally too late, but it would have been worth a try. Now it's too late for that. Your plants should be about day 43.
I wouldn't recommend transplanting during flower.
Typically you repot and then give plants at least 1 week before switching to 12/12.
There are many other ways to continue feeding plants.
Typically you repot and then give plants at least 1 week before switching to 12/12.
There are many other ways to continue feeding plants.
I always wash buds. Cleans them of dust and rinses them. And any bugs. Beneficial of not.
No different to harvesting in the rain. Which I did dozens of times in Hawaii! haha! Rains every damn day sometimes!
And yes foliar as a quick fix... isn't that what this thread was about? Fixing a sick plant? I have foliar fed indicas twice a day up to flush with no ill effects.
I agree with a lot of what Jorge says. But you're way of track with plants being confused by foliar feeding. Sorry but that is just silly.
That's Jorge and his hippy growing style. No science behind it. Sorry.
I advise getting a second guru in your life.
Like defoliation. He is against it. But he is an outdoor farmer. Taking outdoor leaves is dumb. The sun can penetrate.
I am indoor. And those leaves get chopped... To each their own as usual...
coconutcurry
High
mushroombrew;8013851 Typically you repot and then give plants at least 1 week before switching to 12/12.[/QUOTE said:
Ok I'll take you up on that. I have a sour nightmare at 3 wks flower. She is in a 1 gallon soil. I'll pot her up tonight and see!
