One month into flower this ALWAYS happens.

2 tents going and this happens in both. One month into flower the middle to newer leaves start to do this (see pics). Ph is checked, ppm is on low side. It is more pronounc ed on certain strains but happens to about 25-30% of plants (600w/1000w HP's) Anyone?? I do have big jumps between water (5-10% runoff ) to very light pots.

calcium dawg

Those are the older leaves not new growth
It happens stop posting pics of a leaf , it makes it hard to judge your grow
Hit em with Epsom Salt about a teaspoon a gallon dissolved in warm water

lukedaduke said:

calcium dawg

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They were given cal/mag at 200-240ppm early in flower...too much cal??

Never had a prob with cal just p bc it likes to drift my soil ph

Herb & Suds said:

Those are the older leaves not new growth
It happens stop posting pics of a leaf , it makes it hard to judge your grow
Hit em with Epsom Salt about a teaspoon a gallon dissolved in warm water

Click to expand...

he said:

urbanmedgrower said:

he middle to newer leaves

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so I dunno, sure looks like calcium def. if it was magnesium I would expect it to show on the oldest leaves first and the necrotic spots would only show on the tips after the interveinal chlorosis got pretty bad. I dont really see any interveinal chlorosis on the leaves in the pics. but yeah I would say cover your bases and use both epsom salts and some form of calcium, probly not calcium nitrate, too late in flower, maybe calcium gluconate? up to you really

I have had issues like that when using nutrients a local hydro store made. Since switching to GH and using their feeding chart I have not seen this kind of problem. I suggest picking a cannabis nutrients from a large chain and following their directions.

Herb & Suds said:

Those are the older leaves not new growth
It happens stop posting pics of a leaf , it makes it hard to judge your grow
Hit em with Epsom Salt about a teaspoon a gallon dissolved in warm water

Click to expand...

No Epson thanks.

Herb & Suds said:

Those are the older leaves not new growth
It happens stop posting pics of a leaf , it makes it hard to judge your grow
Hit em with Epsom Salt about a teaspoon a gallon dissolved in warm water

Click to expand...

Rider101 said:

I have had issues like that when using nutrients a local hydro store made. Since switching to GH and using their feeding chart I have not seen this kind of problem. I suggest picking a cannabis nutrients from a large chain and following their directions.

Click to expand...

Using gh 3 part (very close to "useless" formula)

urbanmedgrower said:

2 tents going and this happens in both. One month into flower the middle to newer leaves start to do this (see pics). Ph is checked, ppm is on low side. It is more pronouncView attachment 4395439 ed on certain strains but happens to about 25-30% of plants (600w/1000w HP's) Anyone?? I do have big jumps between water (5-10% runoff ) to very light pots.View attachment 4395431 View attachment 4395430 View attachment 4395430 View attachment 4395431 View attachment 4395434

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Normal die off of weak/old leaves.
No problem

I hit my plants with epsom salt (I see you said you have) with no added nutrients a couple times per cycle. Generally clear this type of thing up.

I think I use 2 tablespoons per 5 gal or so. Then hit em again if it doesnt clear up.


Though, if most of the plant is healthy an happy theres not reason to care

u using tap water?
it is possible that there is shit in there locking up calmag
even chloramine possibly causing this problem

to figure out if water is the problem just do one plant with good water and the rest with tap and seee the difference

Have you checked your water prior to using it? There can be tons of shit in tap water, and it could be different from house to house. For instance, my tap water currently has a reading of 130 ppm, and a neighbors' water is @ 330 ppm...without testing it, who knows what's in there?

GreenTools said:

Have you checked your water prior to using it? There can be tons of shit in tap water, and it could be different from house to house. For instance, my tap water currently has a reading of 130 ppm, and a neighbors' water is @ 330 ppm...without testing it, who knows what's in there?

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34-54ppm (3 years and thats the variance)

urbanmedgrower said:

34-54ppm (3 years and thats the variance)

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Its not your water or nutes then it could be your growing medium or genetics. I got free skunk seeds with my order from England in 2004 they all had this issue while other plants did not, all the plants were fed using the same rez on a non-recovery rockwool system.

BTW what are you using for your growing medium.

Rider101 said:

Its not your water or nutes then it could be your growing medium or genetics. I got free skunk seeds with my order from England in 2004 they all had this issue while other plants did not, all the plants were fed using the same rez on a non-recovery rockwool system.

BTW what are you using for your growing medium.

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Promix hp

Have you tried flushing your system every month with Flora Kleen Rinse?

General Hydroponics FloraKleen removes fertilizer residues that can accumulate over time in hydroponic systems, growing media, and potting soils. Use FloraKleen monthly to purge your hydroponic system or potted plants of excess salts that can accumulate as a result of regular fertilizer application. FloraKleen is an excellent final flush, and can be used at any time to dissolve mineral and salt buildup. Its high concentration and low price make FloraKleen the economical choice for maintaining your plants in both hydroponic and soil-based environments.

• Dissolves accumulated fertilizer salts.
• Reduces plant stress from excess and imbalanced nutrients.
• Releases nutrient bonds between plants and systems, also correcting nutrient lock-out.
• Use FloraKleen as a final flush a few days before harvest to promote maturation and sugaring.
• Safe for use in all systems and media while plants are growing.

It would help if you're hps was off when you took pictures. You say it keeps happening at the same time. Is it in the same floor space?
Looks like phosphorus deficiency to me. I believe they're just hungry. The leaves look like they have a purple tinge and all of those stems are turning red. But can't be sure since the leaves are off of the plant now. And the other pics lack real color.
I ask about the floor space because (in my experience) indoor plants that are flowering under hps lights that are exposed to more heat (and direct light) than the other ones near by eat more than their neighbors. So while they are all probably in the same size range when you put them in as they grow closer to the light the ones closest are going to eat more nutrients and be slightly more susceptible to deficiency.

Rider101 said:

Have you tried flushing your system every month with Flora Kleen Rinse?

General Hydroponics FloraKleen removes fertilizer residues that can accumulate over time in hydroponic systems, growing media, and potting soils. Use FloraKleen monthly to purge your hydroponic system or potted plants of excess salts that can accumulate as a result of regular fertilizer application. FloraKleen is an excellent final flush, and can be used at any time to dissolve mineral and salt buildup. Its high concentration and low price make FloraKleen the economical choice for maintaining your plants in both hydroponic and soil-based environments.

• Dissolves accumulated fertilizer salts.
• Reduces plant stress from excess and imbalanced nutrients.
• Releases nutrient bonds between plants and systems, also correcting nutrient lock-out.
• Use FloraKleen as a final flush a few days before harvest to promote maturation and sugaring.
• Safe for use in all systems and media while plants are growing.[/QUO

Click to expand...

JimmiP said:

It would help if you're hps was off when you took pictures. You say it keeps happening at the same time. Is it in the same floor space?
Looks like phosphorus deficiency to me. I believe they're just hungry. The leaves look like they have a purple tinge and all of those stems are turning red. But can't be sure since the leaves are off of the plant now. And the other pics lack real color.
I ask about the floor space because (in my experience) indoor plants that are flowering under hps lights that are exposed to more heat (and direct light) than the other ones near by eat more than their neighbors. So while they are all probably in the same size range when you put them in as they grow closer to the light the ones closest are going to eat more nutrients and be slightly more susceptible to deficiency.

Click to expand...

That's the most sound answer yet...I had a sneaky feeling it was light related. (Heat/light) I'm always nervous to over feed!!

urbanmedgrower said:

That's the most sound answer yet...I had a sneaky feeling it was light related. (Heat/light) I'm always nervous to over feed!!

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Then don't over feed. Just give them a little more of the same nutrients in the same concentration as the healthy ones.
I think that they are just "cannabilizing" (lol) themselves because the buds are more important than a few leaves. I look for that kind of activity to tell if they want a larger amount of flowering nutrients too. I could be wrong (and it's up to you) but I would still give just the effected plants a little more food. Without upping the phosphorus yet. And also give them a half a dose of calmag at the same time. Just helped a buddy with really similar symptoms. And saw a few on a plant of mine. What I just suggested fixed it. Not that anything is actually broken. The plant is just trying to make bud with what it has.

As long as I'm sure its not some infection, I leave some of the effected leaves there as tattle tales. If they stop getting worse then all is well. If not then you're getting close anyway. I'm sure you'll be fine.
How are your temps?
Other than a few leaves you have some good looking plants so far.

So, leave some of those leaves on the plant instead of pulling them right away. Watch and see how they progress. They will yellow more as the plant draws what it needs from them and tell you more about what's happening. Or they will stop progressing, in which case, you have solved the issue.