Help a newb out with identifying issues

Hi All,

Not sure if this is the right spot to post this, new here. But I have an auto that’s about 6 weeks out still, and has started yellowing on the larger leaves. Main concern is that it seems to be spreading to upper, and smaller leaves. And, I have a hard time figuring out from the symptom checker which issue it is:

@Farmtown It would be better if you started your own post. trying to work with two different folks in one post is too confusing.

Grow Cycle - I Love Growing Marijuana Forum +New Topic in the upper right corner of the page.

Tag me like @bob31 and I will post a support ticket for you to fill out.

Thanks for the tip, but I do not see any button to start a new topic.


You might still be too new to start a topic. I recommend reading other topics, commenting and asking questions and giving out some likes.
You should be able to start a new topic soon.

I think I got in trouble for accidentally supplying my personal info. Will take the advise below.

Thanks much…

um, ok, but you have already started a new topic about the problems you were having with the mites. I don’t know why you couldn’t start a new topic now?

So just post your new problem on that topic instead of this persons thread @Farmtown

You’ve reached the maximum number of replies a new user can create on their first day. Please wait 23 hours before trying again.

This is what I’m seeing, sorry. Ill reply as soon as it lets me…

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Strain; Super Skunk (Fem)

Soil in pots, Organic Superior Potting Mix

System type?

PH of runoff or solution in reservoir? Just run off at bottom of pots. Because the pots are big i don’t usually water so much that it does run off that much.

What is strength of nutrient mix? Not sure how to answer this?

Indoor or Outdoor = Indoor
Light system, size? Mars 300 watt Led Grow light Full Spectrum

Temps; Day temp average 14C Night temp Average = 5C
Humidity; 69%

Ventilation system; Sitting in a huge shed with natural ventilation. 7m x 7m

AC, Humidifier, De-humidifier, None

Co2; Yes, No
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you smile
This will help us tell you what is going on.

@Anubis welcome to ILGM Thanks for answering the Support ticket questions, but we need some more info

Sorry, I am not familiar with this product. Please take a picture of the ingredients on the bag or list them please.

What size pots are they in?

What is the pH of your water? MJ plants in pot need their pH to be within a specific range with 6.5 being the sweet spot for soil and 5.8 for soil less mediums.

You need a pH Meter, ph up and down and calibration fluid

Here are some links for reference, so you know what I am talking about

just ph meter

ph and tds meters

ph up & Down

Ph test kit - drops

7.0 calibration fluid

In the photo above you showed a bottle of liquid fertilizer? Looked like anyway? No nutrients until they reach about 6 true sets of leaves

How far away is your light from your plant?

Here is a pH chart to help you understand why pH is so important. If you are outside the range then the nutrients can’t be absorbed.


All good info as usual @bob31 and advice

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Hi Bob,

Thanks so much for your help. I’m attaching 2 photos. 1 is of the potting mix I’m using and the other is of the pot size, the lighter hopefully will give the aspect ratio.
I’m going to a hydro shop tomorrow to pick up some PH tools to test the water/soil etc. I will post the results as soon as I have them.
Hopefully I can rectify this before its too late.

Is there anything else you need from me?

Oh and the light is about 8 inches above the plants.

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Is there more than 1 topic that you are using @Anubis?
As I’ve stated in the other thread 8in is way too low for the 300w Mars hydro light .
If it is left at that hight it will street yang girl maybe even kill her,and in flower ,it will definitely bleach buds at that height
Now with Hid lighting you can judge by the back of the hand method, however with led they do not put off the heat of hid but intensity of FOCUSED light is what you have to be careful of!

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Thanks, what do you suggest is the optimum height for this?

And no this is the only thread.

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I have 3 of the same lights.
I started at 32in for seedlings, then 28,until mid veg,dropped the 2nd and tweaked down.
Just installed 3rd last week, flipping to 12-12 this weekend :sunglasses:
:edit , every time I added light I raised them a few inches so as not to stress her.
Hope this helps!
Oh and can you turn the potting soil bag around so we can see the nutritional analysis? It will help @bob31 out

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I agree with @Nug-bug on the light issue
Just my two cents
Good call Nug :+1::cowboy_hat_face:

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I hope you have holsin in the bottom of that pot you showing. This is recommended for Mars 300 and in general for led panel lights. But you don’t have any problem whit light burn…

I found it on the Bunnings website. Here is what they have listed:

This premium organic potting mix is boosted with organic fertiliser and is perfect for growing vegetables, herbs, fruit and salad greens organically.

It is perfect for pots, raised garden beds or adding organic matter to veggie patches. NASAA certified.

Contains superior composted pine bark
Contains premium blood and bone fertiliser
Contains organic carbon to promote microbiological activity
Certified by NASAA-National Association of Sustainable Agriculture Australia

This “appears” to be a soil less mix of mediums, so the ph of your water would be 5.8

It also contains fertilizer which makes it a little hot for sprouting.

Move that light up as suggested, that is way too close!

@Anubis do you have any questions? If you are having problems with the ph meter and ph up and down the test kits and ph adjusters can be purchased as a pet store. Not the most accurate but better than doing nothing

Don’t forget to tag @bob31 @Nug-bug when you reply

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Thankyou for the replies. I hope I’m tagging correctly. I just dragged the names down into the reply? Please forgive me if this is incorrect.

So I went out an got a soil tester and a water PH kit, some up and down as well.

My soil says its about 7.0 and the water was about 7 (Tap Water) as well. So i added some PH down and got it to about 5.5. I then watered again.
I have also raised the light about 12 inches so its sitting at about 20 inches.

Now this is just water with no nutrient additive. Once I get the PH at the right level is it then that I can add some nutrient additive?

Thanks again for your help…

Thanks so much for this diagram, very useful…

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@Anubis You tag us the same way I tagged you by putting the @ in front of the username.

You water with water at the correct pH. You will need to check the bag of soil and see if it says how long the fertilizers last? In some cases the fertilizer is enough for the whole grow.

When you water your plants water them slowly until you get water runoff. This will ensure that the get enough water. You don’t water again till the pot is dry again. You can left the pots dry and wet so you can tell the difference or use your index finger down to the first knuckle to be sure it is dry down that deep (as a general guide)

How old are your plants from sprout and what size pot are they in right now?

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