first grow. day 21 flower. too much yellow HELP!!!!!

Ok guys. I think I have it nabbed as a cal/mag issue. What do you think?
Please dont reply If you have no idea.


I ph my water to about 6.0 based on the color tester
No soil ph meter so Idk where thats at.
Using flora-series 3-part system: floragrow, floramicro, and florabloom all with manufacturer sugested amounts.

I messed up my yield on my first plant which can be seen in the last pic. Hoping to not do the same on these other 3.

77degrees with light on
12/12 under 1000w hps
Fan blowing over top of them
Low humidity, rather dry.

mikebeezy said:

Please dont reply If you have no idea.

Click to expand...

Lol, sorry but i'm pretty tipsy at the moment and I have too XD

as far as deficiencies go that's the prettiest looking one i've seen so far!

How often are you feeding nutes? and how much are you feeding?

also what medium have you been using?

Im feeding nutes every feeding. roughly every 4 days, when its dried out. I feed about 12oz of water.

Using promix soil. 2 1/2 gallon pots.. the nutes call for a mixture of all 3 types (grow, micro, and bloom) with a total of 6 teaspoons per gallon.

Xrangex said:

as far as deficiencies go that's the prettiest looking one i've seen so far!

Click to expand...

Did you mean literally, or did you mean It just doesnt look bad?

A couple questions first....
What are the N-P-K ratios of he nutes you are using?
Did the problem start at the top of plant or at the bottom?

Believe the bottom... its a 3-part system.

One Is 2-1-6
One is 5-0-1
One is 0-5-4

The first 2 weeks they got equal amounts of each. Only yesterday did I change to the bloom feeding which is 1 part grow, 2 part micro, 3 part bloom

mikebeezy said:

Im feeding nutes every feeding. roughly every 4 days, when its dried out. I feed about 12oz of water.

Using promix soil. 2 1/2 gallon pots.. the nutes call for a mixture of all 3 types (grow, micro, and bloom) with a total of 6 teaspoons per gallon.

Click to expand...

i'm guessing you're using the General Hydroponics tri series, you really only need micro and bloom at this point.


I wish I was more experienced in deficiency issues, I want to see this grow get better! they're such beautiful flowers right now.

If I were YOU i'd invest in a ph/ppm meter immediately. The color test works very well for ph'ing the water (i've used it alot) but the ppm meter can do wonders, since you really have no idea what you're feeding your girls unless you have one or you're very experienced with the nutes you're using.


By the pictures i'm guessing you're in 2-3 weeks of 12/12, if so the buds themselves are exactly where they need to be. The most I can suggest (I'm abit of a noob myself when it comes to deficiencies) is to flush out whatever nutes you have (plain water ph'd to about 6.1) for about a week and see if that helps at all.

(experienced growers who disagree, seriously i'm not that amazing of a grower at this point so any info you can give this guy would be awesome)




Anyway, i'm subbed to this thread incase you're planning on updating it, goodluck man I really hope everything goes well

mikebeezy said:

Did you mean literally, or did you mean It just doesnt look bad?

Click to expand...

Don't get me wrong, there's definitely something not perfect with the plants, i was just saying I really like the way the yellowing ends look on the plant.


EDIT: again, i'm pretty drunk and i dont want you to miss-understand... the plants look unhealthy, but what i ment were the colors were ascetically pleasing to me lol

You say flush for a week... how much water would u suggest? I never have runoff, I only feed about 1+ 1/2 solo cup and it lasts 4 days before needing to water again.

A ppm/ph meter is deff on my list of things to get, iv just ran broke from starting from scratch.. a ppm meter and inline fan for the flower room are next.

And yes, day 21 flower, end of the 3rd week on 12/12.
Strains are blueberry (n.l.) and cheese

You should shoot for PH 6.5 in soil.
6.0 locks quite a few things out.
P ,Cal and Mag.

https://www.rollitup.org/attachments/marijuana-plant-problems/1894317d1311360525-guide-nutrient-deficiency-toxicity-nutrient-chart.jpg
Soil medium is on the right of the chart.

mikebeezy said:

Im feeding nutes every feeding. roughly every 4 days, when its dried out. I feed about 12oz of water.

Using promix soil. 2 1/2 gallon pots.. the nutes call for a mixture of all 3 types (grow, micro, and bloom) with a total of 6 teaspoons per gallon.

Click to expand...

Is that how you're feeding the nutes? Are you feeding at "full strength" (0-5-8 -> G- M -B)...that's Lucas Formula.. you could add the Grow if you wanted. Those are PER Gallon numbers in (ML.)

To me I want to say it's a N (nitrogen) deficiency, But I'm not 100% sure.

You are also on the lower end of the PH range for soil.

OK experts here at RIU, come on now, this guy needs your/our help!

mikebeezy said:

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Ok guys. I think I have it nabbed as a cal/mag issue. What do you think?
Please dont reply If you have no idea.


I ph my water to about 6.0 based on the color tester
No soil ph meter so Idk where thats at.
Using flora-series 3-part system: floragrow, floramicro, and florabloom all with manufacturer sugested amounts.

I messed up my yield on my first plant which can be seen in the last pic. Hoping to not do the same on these other 3.

77degrees with light on
12/12 under 1000w hps
Fan blowing over top of them
Low humidity, rather dry.

Click to expand...

Thanks for that... so to raise soil ph do I just add a higher ph water? I thougjt 5.8 was the best water intake value.. how would I maintain a higher soil ph n keep my water ph down? Idk im confused... I need a soil meter first anyway. Hoping to get the truncheon

Its deff. Getting nitrogen intake. Whether its locking it iut I dont know. I am feeding at full strength, 1 tsp per gallon of grow, 2 per gal of micro, 3 per gal of bloom. That is the bloom feed schedule. I only fed it that yesterday. The other feedings since going 12/12 were 2 parts of each as suggested on the bottle.

mikebeezy said:

You say flush for a week... how much water would u suggest? I never have runoff, I only feed about 1+ 1/2 solo cup and it lasts 4 days before needing to water again.

A ppm/ph meter is deff on my list of things to get, iv just ran broke from starting from scratch.. a ppm meter and inline fan for the flower room are next.

And yes, day 21 flower, end of the 3rd week on 12/12.
Strains are blueberry (n.l.) and cheese

Click to expand...

this is your problem. if your not getting any runoff when you water then your not flushing out any of the built up salts in return is causing you lockout. and every time you feed your just adding more. make sure you water till you see some runoff. for now I would give it a good flush then start them back on light nutes.

It looks like you're using nutrients designed for hydro...not soil. That won't work. The same company has nutrients for soil called "General Organics" that you should be using. You had better switch pretty quickly.

flush with 2 times the size of ur pot i.e... 1 gallon pot makes 2 gallon flush. Soil you want ur ph around 6.5, 5.8 is soilless. you want to see a nice amount of run off when you feed and water so you know it is not building up in ur soil, and feed them every other time, 1 feed, 1 water, 1 feed, 1 water, ect... and start your nutes @ around 25-50% for first few feedings and see how they take it before bumping up to full strength.

Loos like an advanced magnesium deficiency to me. Cannabis is a magnesium loving plant in flower, because of all the very rapid growth, magnesium and calcium play a big part in it. Calcium may be in the tap water but magnesium won't be.

For future reference; Major and Secondary nutrient deficiencies start at the bottom and spread upwards. Micro nutrient deficiencies start at the top and go down.

This is what i would do.
Go out TODAY and buy a PH meter and a TDS meter. You should be able to get both of them for $50-60 bucks ($25 per). You also need to flush them TODAY and use the TDS and PH meter to check run off. When you get the PPM level down about the same level as your tap water you are good to go. Let them drain and then feed them right away with a food that has a good amount of Nitrogen in it....stay away from "bloom" food with higher levels of P or K. I use a 20-20-20 and it works fantastic..so you could combine equal parts of your micro and bloom to get a 5-5-5 and that should work. Use the TDS meter when you mix nutes and feed around 400ppm. Also check the PH of runoff when you start and let us know what that is.
ALWAYS feed until you have plenty of run off. For a 2.5 gal pot...1 gallon of water per feeding should give you plenty of run off. only feeding 12 oz's of water will cause salt build up in your soil.
Continue feeding with the 5-5-5 until they get green again. if its not working try giving them the 5-0-1 for a few feedings. To be honest i would stop using that brand of nutes and go with something like dyna grow or Jacks classic but thats another story.

When you get some color back then you can switch to the "flower" food again but be careful with it and go back to the higher nitrogen food if it starts to yellow again. I would also recommend that you dont feed at the rates they suggest. keep the ppm level of each feeding in the 400-800 range and see how it goes.

Read this...https://www.rollitup.org/marijuana-plant-problems/158144-never-ending-abuse-phosphorous-bloom.html


In order to save these you really need to do this right away. From the pictures they could be suffering from a lot of issues and its better to flush and start over then to try to figure out which nutrient it needs and potentially create more problems.