Light burn or nute issue?

Chunky Stool · Mar 30, 2017

I'm a big fan of not spraying anything on flowering plants unless it's necessary.
I recently had to spray my flowers to control a mite infestation that was on the verge of taking over. It worked great, but those buds may end up being cannabutter if the smoke is harsh. It was a calculated risk. I know that picking a couple of weeks early will definitely diminish the quality, so I took a chance. Might turn out great; might not. We shall see...

rkymtnman · Mar 30, 2017

chasingwaterfalls said:
Ppm meter read 600 this morning (I unfortunately don't know anything about what conversion it's using).

If I've taken care of the ph problem and lessened nutes, is there anything I might be able to do to help - or do I now just have to wait and see?

just take it easy as you can on them at this point. light feedings and keep using hydroguard so you don't get rot.

i wouldn't foliar anything at this point. you risk molding your buds unless you have really really good airflow. and even then i personally wouldn't.

rkymtnman · Mar 30, 2017

Chunky Stool said:
I'm a big fan of not spraying anything on flowering plants unless it's necessary.

ditto. vegging sure, but flowers nope.

OldMedUser · Mar 30, 2017

eyderbuddy said:
https://www.ncbi.nlm.nih.gov/pubmed/6100300
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0068214
https://www.pgia.ac.lk/files/Annual_congress/journel/v26/Journal-No 1/Papers/7. H.A.R.K. Jayawardana-edited.pdf
30 seconds in google my testy friend, i'm just sharing information

We all know calcium's role in plant health but that has nothing to do with what's going on with his plants so how is any of what you posted relevant? They aren't even about cannabis plants.

The plants are overloaded with nutes which causes burning as exhibited and the leaves most affected are those that receive the most radiant heat from the lights.

This page of cannabis nutrient problems has some pics of salts buildup near the top of the page that look suspiciously just like the OP's. I've seen it in my own plants more than a few times.

Spraying anything on plants in the middle of flowering is to be avoided unless it's the last resort before total crop loss and those plants are not even getting close to that.

Chunky Stool · Mar 30, 2017

OldMedUser said:
We all know calcium's role in plant health but that has nothing to do with what's going on with his plants so how is any of what you posted relevant? They aren't even about cannabis plants.

The plants are overloaded with nutes which causes burning as exhibited and the leaves most affected are those that receive the most radiant heat from the lights.

This page of cannabis nutrient problems has some pics of salts buildup near the top of the page that look suspiciously just like the OP's. I've seen it in my own plants more than a few times.

Spraying anything on plants in the middle of flowering is to be avoided unless it's the last resort before total crop loss and those plants are not even getting close to that.

( Sarcasm.Enabled = true )
Only a noob would trust first-hand experience over a google search... :dunce:

( Sarcasm.Enabled = false )

chasingwaterfalls · Mar 30, 2017

OldMedUser said:
We all know calcium's role in plant health but that has nothing to do with what's going on with his plants so how is any of what you posted relevant? They aren't even about cannabis plants.

The plants are overloaded with nutes which causes burning as exhibited and the leaves most affected

eyderbuddy said:
I'd recommend an urgent dose of Foliar Silica, followed by Foliar Cal-Mag at the lowest effective dose you can come up with it.

Thanks you all for this - it's helpful to have all this emphasized.

I've never looked into foliar spraying because of not wanting to potentially smoking it, so im glad to know I got at least one hunch right.

I'll sit tight for now, and I get the often frustrating part of growing with the time lag; the damage I'm seeing today began a week ago, and fixing ph might not show that it's working until a week from now

chasingwaterfalls · Mar 30, 2017

OldMedUser said:
We all know calcium's role in plant health but that has nothing to do with what's going on with his plants so how is any of what you posted relevant? They aren't even about cannabis plants.

The plants are overloaded with nutes which causes burning as exhibited and the leaves most affected are those that receive the most radiant heat from the lights.

This page of cannabis nutrient problems has some pics of salts buildup near the top of the page that look suspiciously just like the OP's. I've seen it in my own plants more than a few times.

Spraying anything on plants in the middle of flowering is to be avoided unless it's the last resort before total crop loss and those plants are not even getting close to that.

Wow, am I stoned to have missed this, but lucky to catch the link. I'm going to add some plain water to lower the concentration for now

rkymtnman · Mar 30, 2017

i would go down to 3/6 Lucas for a few days and then try 4/8 if they look OK. that should be a better ppm for them to try to recover.

chasingwaterfalls · Mar 30, 2017

rkymtnman said:
i would go down to 3/6 Lucas for a few days and then try 4/8 if they look OK. that should be a better ppm for them to try to recover.

I didn't get home in time before the light went out, so I couldn't take pictures, but the leaves were more yellowed, the lower ones were drooping, and some were curling up at the tips. I added 2 gallons of tap, which I know isn't ideal.

The plant def looked like the pic of nute burn from https://drugs-forum.com/growfaq/97.htm

rkymtnman · Mar 30, 2017

chasingwaterfalls said:
I didn't get home in time before the light went out, so I couldn't take pictures, but the leaves were more yellowed, the lower ones were drooping, and some were curling up at the tips. I added 2 gallons of tap, which I know isn't ideal.

The plant def looked like the pic of nute burn from https://drugs-forum.com/growfaq/97.htm

for sure. you overcooked them.

it's hard not to overfeed in hydro.

light feedings with hydroguard at 5.8 ph and hope for the best!

chasingwaterfalls · Mar 30, 2017

rkymtnman said:
for sure. you overcooked them.

it's hard not to overfeed in hydro.

light feedings with hydroguard at 5.8 ph and hope for the best!

Oh boy. Nothing like changing a res out twice in the same week. Worth it though, you and OldMedUser deserve some of this plant if it makes it througj

chasingwaterfalls · Mar 31, 2017

In case it's helpful to have a pic for posterity.. leaves are indeed worsening. Changed out res to 3-6 lucas + hydroguard. Thanks again guys!

eyderbuddy · Mar 31, 2017

OldMedUser said:
We all know calcium's role in plant health but that has nothing to do with what's going on with his plants so how is any of what you posted relevant? They aren't even about cannabis plants.

The plants are overloaded with nutes which causes burning as exhibited and the leaves most affected are those that receive the most radiant heat from the lights.

This page of cannabis nutrient problems has some pics of salts buildup near the top of the page that look suspiciously just like the OP's. I've seen it in my own plants more than a few times.

Spraying anything on plants in the middle of flowering is to be avoided unless it's the last resort before total crop loss and those plants are not even getting close to that.

The functions of Calcium & Silica in plant growth are well known just as you said. Foliar Cal-Mag would temporarily improve photosynthesis and reduce the amount of compound build up in the leaves, and transforming them into usable plant energy. Silica would help with quick cell repair. It's basically a 1, 2 Doctor combo, leech or transform the toxic excess, and close the incision.

I think being Afraid of Foliar Spraying is very injustified. It is a very legit, quick and effective way of managing plant nutrition and health as long as its done correctly. Just gotta know what you're doing.

rkymtnman · Mar 31, 2017

eyderbuddy said:
I think being Afraid of Foliar Spraying is very injustified.

did you look at the last pic the OP put up? that's the result of excess nutes, not deficiencies. adding more N and Ca and Mg wont' help at all.

those leaves are just about where you could crumble them in your hand. you could foliar with a mix of unicorn sweat and leprechaun tears and they'd still look the same.

he needs to baby them and hopefully have a decent harvest of what's there already. and learn for the next time.

chasingwaterfalls · Mar 31, 2017

rkymtnman said:
he needs to baby them and hopefully have a decent harvest of what's there already. and learn for the next time.

Is there now a hard stop for this plant? Like, should I plan on harvesting when all the larger fan leaves have died/wilted to a crisp?

EDIT: not sure if I can still wait for ideal trichomes or if the tiny leaves under the buds would be enough to keep the plant alive for longer

rkymtnman · Mar 31, 2017

i'd just wait until you chop. see what happens. what lights are they under? maybe raise up the lights or dim them to try to baby them even more.

if they survive until you maybe get some cloudy trichs, at least you'll have some smokable buds.

they are pretty tough, they want to survive too. just keep an eye for any male seeds or anything like that. the stress might cause them to hermie or go male.

chasingwaterfalls · Mar 31, 2017

I'm using an Advanced LED (xte 300), drawing about 270w right now (power at about 100%, it's got dimmer switches). Just raised the light all I can, another 3 inches, and set the intensity lower.

Such a shame it smells like grass now because it's still got some of the best-looking flowers I've ever grown.

HotBunz · Mar 31, 2017

chasingwaterfalls said:
I've never even looked into foliar feeding, but I will now..

Just doesn't feel right waiting and doing nothing when my plant's not doing too well

As already noted do not foliar feed this late in the game. Any foliar feeding would be done before any flowers form.

HotBunz · Mar 31, 2017

While it could be genetic with this strain I am surprised no one has noticed the purple stems. I would say that between the massive PH issue and a much to high PPM this plant is dealing with nute lockout now. I believe the OP stated his PPM has not moved in a week. As for the purple stems that would make me think a mag def.

chasingwaterfalls · Mar 31, 2017

HotBunz said:
While it could be genetic with this strain I am surprised no one has noticed the purple stems. I would say that between the massive PH issue and a much to high PPM this plant is dealing with nute lockout now. I believe the OP stated his PPM has not moved in a week. As for the purple stems that would make me think a mag def.

Yeah, after that last res change, my ppm meter hovered around 900, give or take 20, but again, idk what conversion this is

75% strength lucas

I've currently got just GH Micro+Bloom in the res, is that enough mag?

It's blue dream if it helps..

Light burn or nute issue?

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