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Cannabis nutrient and/or watering problems

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  • Start date Start date Apr 20, 2025
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Cannabis nutrient and/or watering problems

Kush.0g Apr 20, 2025 15 Replies 2,852 Views
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Kush.0g

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#1
Hey first time grower here. My cannabis plant leaves are curling and I’m having some sort of nutrient issue. I’ve been ph testing and watering every 2-3 days using a moisture meter to test the soil. I’m using organic soil with coco choir. Any tips or advice helps.
 

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Bobcat.Branch

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#2
Kush.0g said:
Hey first time grower here. My cannabis plant leaves are curling and I’m having some sort of nutrient issue. I’ve been ph testing and watering every 2-3 days using a moisture meter to test the soil. I’m using organic soil with coco choir. Any tips or advice helps.
Click to expand...
Are you watering every 2 to 3 days religiously, or because they need it? What are the results of your pH testing? What are you feeding your plant? How much? How often?

Every single detail you can provide will only help.
 
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HerbalEdu

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#3
... also what coco to soil ratio ?
 
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#4
HerbalEdu said:
... also what coco to soil ratio ?
Click to expand...
1/3 coco
 
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Kush.0g

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#5
Bobcat.Branch said:
Are you watering every 2 to 3 days religiously, or because they need it? What are the results of your pH testing? What are you feeding your plant? How much? How often?

Every single detail you can provide will only help.
Click to expand...
Ph is 5.5-6, I’m using cronk nutrients, following there grow chart for feeding. And the moisture meter Indicates they need water every 2-3 days.
 
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RoadKillSkunkHunt

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#6
Kush.0g said:
Ph is 5.5-6, I’m using cronk nutrients, following there grow chart for feeding. And the moisture meter Indicates they need water every 2-3 days.
Click to expand...

What kind of moisture meter are you using? Sometimes the simplest is best. This is the kind I recommend. No batteries. No fuss.



Your leaves look hungry. They can't feed because your soil pH is out of line. I realize some people do it, but mixing coco with an organic potting mix tends to throw everything out of balance and is likely part of your problem. The other? Overwatering ... which means watering too frequently.
 
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Bobcat.Branch

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#7
Kush.0g said:
Ph is 5.5-6, I’m using cronk nutrients, following there grow chart for feeding. And the moisture meter Indicates they need water every 2-3 days.
Click to expand...

For 3:1 soil:coco I think pH of 5.5-6.0 may be a tad low. While I've not done a mix like that, I would probably shoot for 6.0-6.7, and primarily target 6.3-6.6 if you can get that accurate. Tough call!

My gut tells me they are lockout by out of band pH, and maybe exacerbated by over feeding. If the coco was unbuffered, it's going to be tougher to get calcium and magnesium to uptake, too.

The midribs and veins of the leaflets indicate overfeeding of nitrogen, but pH lockout could be preventing uptake across the board.



 
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Bobcat.Branch

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#8
RoadKillSkunkHunt said:
What kind of moisture meter are you using? Sometimes the simplest is best. This is the kind I recommend. No batteries. No fuss.

View attachment 2419294

Your leaves look hungry. They can't feed because your soil pH is out of line. I realize some people do it, but mixing coco with an organic potting mix tends to throw everything out of balance and is likely part of your problem. The other? Overwatering ... which means watering too frequently.
Click to expand...

Bingo. We were typing at the same time!
 
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HerbalEdu

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#9
like Bobcat.Branch have said 2/3 soil 1/3 coco mix should be treated like soil regarding pH: 6,2 to 7,3

and well moisture meter are not always reliable.
 
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Glomus

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#10
Honestly messing around with the PH when your growing in mostly soil seems unnecessary. most good mixes are already PH balanced. you messing with the water PH every time you water just adds an element of inconsistency usually. Your soil PH is one thing, if its really off then you might need to correct it but if that's happening you have bigger issues then PHing your water.
 
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#11
Using a moisture meter is smart, just double-check your pH regularly since coco can shift it fast. While figuring this out, checking info from releaf really helped me understand how the right care impacts medical cannabis quality.
 
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RoadKillSkunkHunt

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#12
HerbalEdu said:
like Bobcat.Branch have said 2/3 soil 1/3 coco mix should be treated like soil regarding pH: 6,2 to 7,3

and well moisture meter are not always reliable.
Click to expand...
I've been growing for years and I completely disagree with not using a moisture meter for someone just starting out. Here's why ... look at all the posts here where incorrect watering practices are the heart of the issue. Light pot/dry pot can be ambiguous to the new grower. For example ... been 3 days since last watering. The pot doesn't feel as light as normal on watering day ... but tomorrow is a busy day so the grower goes ahead and waters on day 3. However if the moisture meter was used, the grower might find that the pot is only half dry and the plant doesn't need watering for another 2 days. Because there's only one method used to determine when to water (light pot vs heavy pot) the grower waters ahead of schedule out of convenience ... which is exactly what we are trying to avoid.

@HerbalEdu - You, personally, have been growing for a number of years. I would trust your judgement regardless of whether or not you use the moisture meter. For someone who is new to growing and has a bunch of plants that look like they are suffering from poor watering practices, it's a necessity as a teaching tool. It belongs in all growers' toolboxes unless they are a hydro grower.

Do I rely on mine? No, not entirely because I look at the leaves and the plant as well. I also pick up the pot to verify. So no, I don't rely on it exclusively ... but it is part of the data that tells me how my plants are growing and how often they need watered/fed. My biggest issue with those who are struggling with the wet/dry cycle is the arrogance we frequently run into on this message board ... "No way its a watering issue." I have been consistently doing xyz. Yet when you look at their plants, the plants don't lie ... they say "we're struggling. We can't breathe."
 
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HerbalEdu

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#13
RoadKillSkunkHunt said:
I've been growing for years and I completely disagree with not using a moisture meter for someone just starting out. Here's why ... look at all the posts here where incorrect watering practices are the heart of the issue. Light pot/dry pot can be ambiguous to the new grower. For example ... been 3 days since last watering. The pot doesn't feel as light as normal on watering day ... but tomorrow is a busy day so the grower goes ahead and waters on day 3. However if the moisture meter was used, the grower might find that the pot is only half dry and the plant doesn't need watering for another 2 days. Because there's only one method used to determine when to water (light pot vs heavy pot) the grower waters ahead of schedule out of convenience ... which is exactly what we are trying to avoid.

@HerbalEdu - You, personally, have been growing for a number of years. I would trust your judgement regardless of whether or not you use the moisture meter. For someone who is new to growing and has a bunch of plants that look like they are suffering from poor watering practices, it's a necessity as a teaching tool. It belongs in all growers' toolboxes unless they are a hydro grower.

Do I rely on mine? No, not entirely because I look at the leaves and the plant as well. I also pick up the pot to verify. So no, I don't rely on it exclusively ... but it is part of the data that tells me how my plants are growing and how often they need watered/fed. My biggest issue with those who are struggling with the wet/dry cycle is the arrogance we frequently run into on this message board ... "No way its a watering issue." I have been consistently doing xyz. Yet when you look at their plants, the plants don't lie ... they say "we're struggling. We can't breathe."
Click to expand...
it's just that for exemple if you dig a little too big hole around the sensor, the sensor may not be in contact enough with the soil and give inacurate results. That could happen if your not carefull enough when puting the sensor into the soil or give a tilt after it's deep for exemple.
 
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RoadKillSkunkHunt

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#14
HerbalEdu said:
it's just that for exemple if you dig a little too big hole around the sensor, the sensor may not be in contact enough with the soil and give inacurate results. That could happen if your not carefull enough when puting the sensor into the soil or give a tilt after it's deep for exemple.
Click to expand...

You don't poke the pot in just one spot though. If that is what the grower is doing, then they are not using the tool correctly. Tools are tools. Its up to the person using it to use it correctly. You check it in 3 or 4 areas then average the results.

https://www.thcfarmer.com/threads/new-simplified-way-to-water.131476/ ... this was stickied for a reason.
 
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#15
RoadKillSkunkHunt said:
You don't poke the pot in just one spot though. If that is what the grower is doing, then they are not using the tool correctly. Tools are tools. Its up to the person using it to use it correctly. You check it in 3 or 4 areas then average the results.

https://www.thcfarmer.com/threads/new-simplified-way-to-water.131476/ ... this was stickied for a reason.
Click to expand...
yeah, speaking for me, i m simply not a fan of digging many holes from the top (as i have standard plastic pots) each watering. (and i never really had any issue with watering frequency and amount without moisture meter)
 
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#16
HerbalEdu said:
yeah, speaking for me, i m simply not a fan of digging many holes from the top (as i have standard plastic pots) each watering.
Click to expand...
And speaking on behalf of you ... you're hardly new at growing. You respond to your plants without making a post here asking what you should do. I put you in the category of a well seasoned grower. That moisture meter is much less of a thing for you because of your experience level.

That's really the big difference. Experience means the grower responds instinctively to whats on hand. Unfortunately, when you are new, you don't have that experience to draw on.
 
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