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Is this is a potassium deficiency?

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Is this is a potassium deficiency?

Gaudy 9 Replies 1,010 Views
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Gaudy

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#1
I think I might have a potassium deficiency though I don't understand why as I'm using FoxFarms Tiger bloom which has potassium nitrate in it. I'm not seeing the problem on all the leaves but there are a few, and maybe more.
 

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#2
Gaudy said:
I think I might have a potassium deficiency though I don't understand why as I'm using FoxFarms Tiger bloom which has potassium nitrate in it. I'm not seeing the problem on all the leaves but there are a few, and maybe more.
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Right off the bat it looks like you have too much nitrogen getting to that plant. The excess nitrogen is interfering with the uptake of your potassium.

What other than Tiger Bloom are you using? Are you using Big Bloom?
 
#3
Looks like potassium lockout from high nitrogen. I've gotten out of this before by just watering with a little bit of molasses only, but you could also do a banana tea... whether you use either, pH it to 6.5, presuming you're in soil. What's funny is it goes the other way too, excess potassium will lock out nitrogen. So when I'm in that mess the other direction I feed with just fish emulsion and it helps restore the nitrogen. The light organic feedings with teas and shit really helps, the plants are more willing to eat it.
 
#4
Ninjadogma said:
Looks like potassium lockout from high nitrogen. I've gotten out of this before by just watering with a little bit of molasses only, but you could also do a banana tea... whether you use either, pH it to 6.5, presuming you're in soil. What's funny is it goes the other way too, excess potassium will lock out nitrogen. So when I'm in that mess the other direction I feed with just fish emulsion and it helps restore the nitrogen. The light organic feedings with teas and shit really helps, the plants are more willing to eat it.
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ok, I made a banana peel water a week or 2 back I can use on it.
 
#5
Smoking Gun said:
Right off the bat it looks like you have too much nitrogen getting to that plant. The excess nitrogen is interfering with the uptake of your potassium.

What other than Tiger Bloom are you using? Are you using Big Bloom?
Click to expand...
was just tiger bloom once a week and normal watering, the FoxFarm page for the tiger bloom didn't make any suggestion that it should be used with something else, which one would think it would if it was needed to be used with another item. I only state this as just yesterday I received a chart to use for nutrients from FoxFarm, not sure where the person got it from that provided it to me but its certainly not on the page for the product itself. (me griping about finding out about this late). I also don't understand why you would need to alternate between nutrients week to week, seems illogical and shouldn't be that complicated. I have roses that I've never gave nutrients to that I've been growing for the last decade and they produce the biggest flowers I've ever seen for a rose.

I flushed my soil with 1 good rinse and then tested the soil the Ph came back perfect, the nitrogen was low and potosh was low, P was at normal/good levels according to the test. Probably should of done this before flushing but it was an after thought.

I should add that not all the leaves are this dark, the lower leaves are of a much lower shade of green, if this matters at all.
 
#6
Gaudy said:
was just tiger bloom once a week and normal watering, the FoxFarm page for the tiger bloom didn't make any suggestion that it should be used with something else, which one would think it would if it was needed to be used with another item. I only state this as just yesterday I received a chart to use for nutrients from FoxFarm, not sure where the person got it from that provided it to me but its certainly not on the page for the product itself. (me griping about finding out about this late). I also don't understand why you would need to alternate between nutrients week to week, seems illogical and shouldn't be that complicated. I have roses that I've never gave nutrients to that I've been growing for the last decade and they produce the biggest flowers I've ever seen for a rose.

I flushed my soil with 1 good rinse and then tested the soil the Ph came back perfect, the nitrogen was low and potosh was low, P was at normal/good levels according to the test. Probably should of done this before flushing but it was an after thought.

I should add that not all the leaves are this dark, the lower leaves are of a much lower shade of green, if this matters at all.
Click to expand...
Coming back here, i went back to the tests i did yesterday as i left the water samples, and the phosphorus sample is now really dark, looking at the charts this can cause super dark leaves as well.
 
#7
Gaudy said:
Coming back here, i went back to the tests i did yesterday as i left the water samples, and the phosphorus sample is now really dark, looking at the charts this can cause super dark leaves as well.
Click to expand...

Oof, says a lot about taking advice based on pictures, don't it? If your numbers show high phosperous and normal nitrogen then you were probably just going a little to heavy on the tiger bloom stuff. And just a guess, your pH was below 6.0?
 
#8
Ninjadogma said:
Oof, says a lot about taking advice based on pictures, don't it? If your numbers show high phosperous and normal nitrogen then you were probably just going a little to heavy on the tiger bloom stuff. And just a guess, your pH was below 6.0?
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Ph read fine, was in the neutral levels, though more research into the validity of old phosphorus samples, looks like age can cause oxidation which is then more blue, so now i have no clue, I did another flush, rinsed the soil until it was a mild yellow, and I just started another P test from that runoff just to double check. I definitely think i was going heavy on the tiger bloom, I also typically water till I get some out of the bottom of the put but maybe I shouldn't be doing that. I'm not used to watering plants in pots, all of my other non-cannabis plants I've planted directly into soil, and simply water according, and I also don't feed them nutrients, just kinda let nature do its thing.
 
#9
Gaudy said:
was just tiger bloom once a week and normal watering, the FoxFarm page for the tiger bloom didn't make any suggestion that it should be used with something else, which one would think it would if it was needed to be used with another item. I only state this as just yesterday I received a chart to use for nutrients from FoxFarm, not sure where the person got it from that provided it to me but its certainly not on the page for the product itself. (me griping about finding out about this late). I also don't understand why you would need to alternate between nutrients week to week, seems illogical and shouldn't be that complicated. I have roses that I've never gave nutrients to that I've been growing for the last decade and they produce the biggest flowers I've ever seen for a rose.

I flushed my soil with 1 good rinse and then tested the soil the Ph came back perfect, the nitrogen was low and potosh was low, P was at normal/good levels according to the test. Probably should of done this before flushing but it was an after thought.

I should add that not all the leaves are this dark, the lower leaves are of a much lower shade of green, if this matters at all.
Click to expand...
So you can easily find their feeding schedule on their website, it took me all of 15 seconds. Here is a screen shot of it.
Screenshot 20250529 164134 Samsung Notes

Every nutrient line will have a feeding schedule. That is how to determine what you do or don't need to pair with your food. A single bottle will rarely tell you what other products to use in the line. It doesn't have to and some labeling guidelines actually may prevent those kind of suggestions (you'd be surprised about what regulatios there are on plant nutrient labeling). But I assure you, the Big Bloom is needed at all stages of plant growth when using the Fox Farm line. In fact its typically sold as a trio for a reason. This is advice I have given hundreds of times and have never once been wrong.

As for what you do on your roses and other plants, well right off the bat growing plants in the ground in nothing like growing plants in a pot, not even close. Plants in a pot have greater limitations and needs. We need to get those correct as the limited amount of medium around the root zone does not offer the same buffer as being in the ground with unlimited root potential; in the ground if there is an issue around the roots they can grow into an area of soil where there is not the same problems. So you cannot compare the two experiences.

I would also highly advise some kind of feeding regiment for your roses, if you think they are looking good now wait until you feed them.

As for your Cannabis plants, that downward curling of the leaf is a sure sign of nitrogen toxicity. So I am not sure how you are testing that soil, but I don't think your test is as accurate as you may believe. Get the Big Bloom going and I am sure you will see improvements on your plants. The micronutrients are truly what is missing from your environment and that is causing nutrients to be improperly allocated within your plant.
 
#10
Smoking Gun said:
So you can easily find their feeding schedule on their website, it took me all of 15 seconds. Here is a screen shot of it.View attachment 2443619
Every nutrient line will have a feeding schedule. That is how to determine what you do or don't need to pair with your food. A single bottle will rarely tell you what other products to use in the line. It doesn't have to and some labeling guidelines actually may prevent those kind of suggestions (you'd be surprised about what regulatios there are on plant nutrient labeling). But I assure you, the Big Bloom is needed at all stages of plant growth when using the Fox Farm line. In fact its typically sold as a trio for a reason. This is advice I have given hundreds of times and have never once been wrong.

As for what you do on your roses and other plants, well right off the bat growing plants in the ground in nothing like growing plants in a pot, not even close. Plants in a pot have greater limitations and needs. We need to get those correct as the limited amount of medium around the root zone does not offer the same buffer as being in the ground with unlimited root potential; in the ground if there is an issue around the roots they can grow into an area of soil where there is not the same problems. So you cannot compare the two experiences.

I would also highly advise some kind of feeding regiment for your roses, if you think they are looking good now wait until you feed them.

As for your Cannabis plants, that downward curling of the leaf is a sure sign of nitrogen toxicity. So I am not sure how you are testing that soil, but I don't think your test is as accurate as you may believe. Get the Big Bloom going and I am sure you will see improvements on your plants. The micronutrients are truly what is missing from your environment and that is causing nutrients to be improperly allocated within your plant.
Click to expand...
Using chemical reactions to test for specific elements. Depending on how concentrated that element is will change how bright the color is, and currently nitrogen and potassium are clear which means 0. Same as how one might test for acidity in water, or chlorine in pools etc.
Leaf tips curling can be caused by many things, not just high nitrogen, same for how dark the leaf is, it's why i resorted to soil samples. The only real way to tell is with data, not assumption based on just visual indicators. But yes I too found this chart after knowing it existed, much appreciated for supplying this information though.
 
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