Yellowing leaves starting on the bottom of plant and working its way up

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WilmaJenkins

New Member
This is my second attempt at growing a purple punch auto from barney's farm. The first grow I had a super bad yellowing problem that made me harvest early. This time I did some research got some cal-mag and a pH soil tester (not a cheap one) but this plant seems to be yellowing too so I'm not sure what I'm doing wrong. The yellowing is starting from the bottom and working it's way up so I know it has to be one or more of the mobile nutrients but I'm not familiar enough to figure it out. I'm using fox farm nutes, cal-mag, viparspectra 450w dimmable light, and fox farm ocean forest soil mixed with a little peat moss and perlite. Any help would be greatly appreciated.
 

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Some more details would help. How old? How much and how often on the fertilizer? Pot size? A full plant pic would help. That FFOF is pretty hot stuff. Normally you don’t need fertilizer for Better than a month. As a guess, I’d say K deficiency as a result of lockout from maybe CaMg additions. Just a guess. We need more info
 
PH is at 6.6, it's in a 3 gal pot, currently on day 33 I fed for the first time on day 30 when I started seeing a little yellowing and it's progressed worse. I have what I used written down but I'm not with my journal at the moment
 
Last edited:
WilmaJenkins said:
PH is at 6.6, it's in a 3 gal pot, currently on day 33 I fed for the first time on day 30 when I started seeing a little yellowing and it's progressed worse. I have what I used written down but I'm not with my journal at the moment
Click to expand...
A whole plant pic would be helpful too so we can see the growth stage and the new growth.
 
Merlin1147 said:
A whole plant pic would be helpful too so we can see the growth stage and the new growth.
Click to expand...

I used 1 ml of cal-mag and 1 teaspoon of grow big in a gallon of water and here's a pic of the whole plant. Did I read correctly that cal-mag can cause nutrient lockout?
 

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WilmaJenkins said:
I used 1 ml of cal-mag and 1 teaspoon of grow big in a gallon of water and here's a pic of the whole plant. Did I read correctly that cal-mag can cause nutrient lockout?
Click to expand...
Too much of any nute can cause l lock out. In the wrong ratio, Ca and Mg are antagonistic to K and the reverse is true. You see a lot of CaMg deficiency early in flower as growers start pumping the K.
I think your plant is just looks hungry. Leaves don’t repair themselves so the yellow ones are going. Clip them or leave them there going to fall off soon enough. No big deal.
 
Merlin1147 said:
Too much of any nute can cause l lock out. In the wrong ratio, Ca and Mg are antagonistic to K and the reverse is true. You see a lot of CaMg deficiency early in flower as growers start pumping the K.
I think your plant is just looks hungry. Leaves don’t repair themselves so the yellow ones are going. Clip them or leave them there going to fall off soon enough. No big deal.
Click to expand...

Okay so in my case are my ratios off and i think I see my plant switching to flower should I start using the bloom as soon as I notice the switch?
 
Is Cal-Mag even needed in soil grows? I just started in Black and Gold Organic under LEDs and I really cant find any evidence that its going to cause cal/mag issues. Why the obsession with it on here?
 
Merlin1147 said:
Too much of any nute can cause l lock out. In the wrong ratio, Ca and Mg are antagonistic to K and the reverse is true. You see a lot of CaMg deficiency early in flower as growers start pumping the K.
I think your plant is just looks hungry. Leaves don’t repair themselves so the yellow ones are going. Clip them or leave them there going to fall off soon enough. No big deal.
Click to expand...
this is spot on. she is just hungry overall.

WilmaJenkins said:
PH is at 6.6, it's in a 3 gal pot, currently on day 33 I fed for the first time on day 30 when I started seeing a little yellowing and it's progressed worse. I have what I used written down but I'm not with my journal at the moment
Click to expand...
one feeding....yes im positive she just wants another dose of food. Give her about 7ml per gallon of grow big and i would use the big bloom every other watering through the whole cycle. (its just soil food , not much plant food in it)

WilmaJenkins said:
Okay so in my case are my ratios off and i think I see my plant switching to flower should I start using the bloom as soon as I notice the switch?
Click to expand...
no your ratios are not off. In fact she dont look bad at all ....shes just a lil hungry. I personally would not start using the tiger bloom just yet .....she dont need it. just a lil grow big and big bloom.
 
inth3shadowz said:
Is Cal-Mag even needed in soil grows? I just started in Black and Gold Organic under LEDs and I really cant find any evidence that its going to cause cal/mag issues. Why the obsession with it on here?
Click to expand...
Thats exactly what it is on these forums ....an obsession.
In the led world , im not sure. they eat slightly different but in the regular world its almost never needed. 99% of the time its a mg issue , its NEVER a Ca and Mg issue..... and on these forums its almost never a calmag issue. Its usually a full diet issue or overwatering issue.
A 2 buck box of epson salts is never a bad idea to have on hand but its rarely needed.
 
getogrow said:
Thats exactly what it is on these forums ....an obsession.
In the led world , im not sure. they eat slightly different but in the regular world its almost never needed. 99% of the time its a mg issue , its NEVER a Ca and Mg issue..... and on these forums its almost never a calmag issue. Its usually a full diet issue or overwatering issue.
A 2 buck box of epson salts is never a bad idea to have on hand but its rarely needed.
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Reminds me of the fitness forums. ALOT of bad advice that gets taken as the holy grail. Im only on day 10 of my first run, and I think reading over these forums at peoples mistakes has helped me a TON so far. Knock on wood, I know ill run into a problem SOMETIME. Seems the biggest problem in order is Over Watering, Feeding nutes too soon, obsessing over cal-mag supps, and using fox farm soil for seedlings ;).
 
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