Need Help With Plants Please!!

gardensofgreen420!

Well-Known Member
I am having some crazy issues with these plants, growing a few different strains but they all seem to display some issues like pictured. brown spots on leaf edges, light yellowing, leaf canoeing & heat stress. Growing in soil happy frog with extra perlite. I use RO water with 5ml of gen organics cal mag+. Soil PH seems to be around 6.0 when I test it... magnesium deficiency? I need some help this things beating me up. Thanks everyone.
 

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gardensofgreen420!

Well-Known Member
My other thoughts are... because I use RO water, I do add the cal mag back but perhaps this is not enough? PPM is around 200 after 5ml. Also should I just lime my soil to get the extra cal mag that way? and if so would I still need to add cal mag back to the RO water? Also if my soil is truly 6.0 I would not be up taking enough Mag correct??
 

Rakin

Well-Known Member
Does it need that much calmag? That looks like it’s getting burned a bit from something. Does happy frog not have enough calcium and magnesium in it to not need more every watering? I don’t know but I would guess it has some. 5ml of calmag is pretty much meeting the entire requirement for a plant that’s not getting any at all from the medium. Not to mention the extra nitrogen. Happy frog has guano in it so I’m sure it’s already got plenty of nitrogen. Just my thoughts, I’ve never used happy frog but I would skip the cal mag for a couple of watering and then introduce it at half strength if I thought I still needed it.
 

gardensofgreen420!

Well-Known Member
My thought is maybe?? just because I take it out with my RO and my starting ppm is like 11. Yes the soil has some in it but I have heard, or shall I say read its not enough. I have had issues with mag before but most was much later in veg or mid flower (same soil) I imagine when it got depleted from the soil. My other school of thought is to also lay off for a watering too and see how it reacts?? that way if it gets worse I will know it needs more.. Instead of pumping more in and hoping it gets better. Thanks for the insight.
 

Rakin

Well-Known Member
I don’t think a soil like that will need any at first. And then probably just occasionally later on.
 

gardensofgreen420!

Well-Known Member
Yes, I agree absolutely in the begining pretty much needs nothing at least for a few weeks. I have been cutting back just seems more then the normal tip burn.. but perhaps its causing a lock-out too? I have noticed the gen organics cal mag drops the water ph like crazy at 5ml
 

Rakin

Well-Known Member
That’s another reason to not use it as much and cut it back. Could always try tap or mixing tap with ro to help the ph and utilize the elements in the tap. Or ditch the cal mag and use epsom if you have a mag issue.
 

gjs4786

Well-Known Member
I have found that the most common problem growers have is that they assume they have a nutrient problem. Either too little or too much, when in fact, it is a pH problem. Not saying that's not the case here, but because you mentioned your pH is at 6.0, if it were me, I would be treating this as a pH issue first and foremost, and once I ruled that out, if the problem persisted, I would look at nutrients.
https://www.growweedeasy.com/ph-fluctuations-cannabis - If you look there, you'll see some of the same symptoms you're experiencing.

As far as I know, at 6.0, cannabis cannot access P, Ca or Mg. At least, according to this chart:


I don't know if this is standard for other growers, but everything I have learned about diagnosing cannabis problems has taught me to always, always, always start with pH.
 

gardensofgreen420!

Well-Known Member
I hear you and the thought passed my mind but the tap here in this part of LA is the worst 650 ppm & 9ish ph.. makes me miss my old water back east.
 

gjs4786

Well-Known Member
I hear you and the thought passed my mind but the tap here in this part of LA is the worst 650 ppm & 9ish ph.. makes me miss my old water back east.
Yeah, but you're running RO water anyway, so that shouldn't be a problem. What do you pH your water to after adding ferts and all? Also, how did you come up with 6.0 for the soil pH? If your soil is indeed 6.0, you have to fix that until your plants will even bother taking up P, Ca and Mg. A lot of growers make the mistake of assuming they have a deficiency, and add more nutrients, when really, they are dealing with a nutrient lockout.
 

Sapphyre

Active Member
You could try a foliar feed of magnesium (epsom salts) on one plant. If you see a rapid change (12-24 hrs) ....start to bring up your ph to allow the nutrients that you've been pumping in - to actually be used. And...then watch for signs of excess!

Just do one at first, so you can easily compare to the others.
I know everyone says at lights off...but I've never had trouble misting w lights on as long as I set the 'wet' plant a little closer to the fan to make sure she gets dry pretty quick ;)
 

gardensofgreen420!

Well-Known Member
You could try a foliar feed of magnesium (epsom salts) on one plant. If you see a rapid change (12-24 hrs) ....start to bring up your ph to allow the nutrients that you've been pumping in - to actually be used. And...then watch for signs of excess!

Just do one at first, so you can easily compare to the others.
I know everyone says at lights off...but I've never had trouble misting w lights on as long as I set the 'wet' plant a little closer to the fan to make sure she gets dry pretty quick ;)
I actually just misted two with a tsp of epsom.. and I was misting most of them last week.. seemed to help a little but nothing major. I actually gave them a foliar with just water the other day to kind of clean everything off.. they looked less happy after. So perhaps they were liking the extra Mg.. Im just trying it on the worst two now.. trying to gauge reactions.
 

gardensofgreen420!

Well-Known Member
Yeah, but you're running RO water anyway, so that shouldn't be a problem. What do you pH your water to after adding ferts and all? Also, how did you come up with 6.0 for the soil pH? If your soil is indeed 6.0, you have to fix that until your plants will even bother taking up P, Ca and Mg. A lot of growers make the mistake of assuming they have a deficiency, and add more nutrients, when really, they are dealing with a nutrient lockout.
The soil seems to be testing at 6.0 with a rapitest kit & also when I soak some soil in water and test the PH with my meter that way.. I was not until recently testing my water PH but started after this issue never had problems before.. strange, anyways I noticed the 5ml of cal mag was dropping my RO frm 7.0 to a 5.5 so now I'm adding PH up in a natural form to bring it to 6.5ish
 

gjs4786

Well-Known Member
Yeah, that's good. I would actually think about flushing with 6.5, testing soil again, and then going back to your feeding schedule. It's possible your soil is buffering to 6.0. In that case, you'd want to think about adding some soil amendments, and it can take a little bit for that to have effects. So hopefully, it's just your input water being at 6.0. I understand you haven't had problems before, that is common. But, when pH isn't checked and everything kept dialed in, this is what happens. :) People will have an issue and they say it hasn't been a problem before. It's never a problem until it becomes one, ya know?
 

gjs4786

Well-Known Member
I actually just misted two with a tsp of epsom.. and I was misting most of them last week.. seemed to help a little but nothing major. I actually gave them a foliar with just water the other day to kind of clean everything off.. they looked less happy after. So perhaps they were liking the extra Mg.. Im just trying it on the worst two now.. trying to gauge reactions.
Dude, you need to rule out nutrient lockout. You shouldn't be fertilizing them right now, foliar or otherwise. Rule out nutrient lock out or you'll just run it to bigger problems. Trying to help ya avoid that.
 

Budzbuddha

Well-Known Member
I use " L A " water too .... I leave out container ( gallon , or large food grade container , pot , whatever ) to gas off some chlorine .... I use PH DOWN to drop to 6.5 .

For feed , I mix nutes in first , then PH DIWN mix to @6.5 .

DONE

Think about it , you water your grass and shrubs / roses / ivy with this MUNICIPAL water.
It's a plant it will be ok. PH your water and mixes ( soil tends to have buffers ALREADY mixed in )
 

gardensofgreen420!

Well-Known Member
Yeah, that's good. I would actually think about flushing with 6.5, testing soil again, and then going back to your feeding schedule. It's possible your soil is buffering to 6.0. In that case, you'd want to think about adding some soil amendments, and it can take a little bit for that to have effects. So hopefully, it's just your input water being at 6.0. I understand you haven't had problems before, that is common. But, when pH isn't checked and everything kept dialed in, this is what happens. :) People will have an issue and they say it hasn't been a problem before. It's never a problem until it becomes one, ya know?
Right, but even when I test the soil out of the bag still getting a 6.0 PH. From what I understand this soil does not have much lime in it and its common people adding dolomite lime to HF & OF soils? although I never have and kind of just used cal mag+ starting to think I should be amending it to buffer that PH better and get the extra cal mag too?? Also yto me if you look at the leaves they look light, more lacking then anything? thanks for the input.
 
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