Yellowing fan leaves early in flower

Not sure if this is a problem, but a few of my fan leaves are yellowing (with slight hint of red/purple) pretty early in flower. These are 100% indica, topped, slightly lollipopped, scrogged and flipped to 12/12 on 5/8/2017.

They are in soil and have been fed the FF trio according to the FF chart. I give them well water so ph should be good.

Is this even an issue? Sorry about the pics, kind of hard to see.

It kind of looks like light bleaching, but could you post a pic of the plant with the lights off possibly?


Hi. Thanks for the reply. Sorry, its kind of hard to take the plant out of the tent due to the scrog setup. I’ll try and take a better pic later today.

I’m using a 210 watt Virgin Borneo LED in a 3ft x 2ft x 5ft tent and the nearest cola is 16 inches away from the light. If it is due to light stress/bleaching that would suck.


Pluck the yellow ones and you’ve got the perfect picture! :grin:

I would guess no prob; but I’ll defer to more knowledgeable growers . . . !

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Haha. Yeah, I wish it were that easy. I live in a hot climate where we run the AC all summer set at 80 (because we average near 100), so I want as many leaves possible when I harvest and dry.


We need more info to make an informed decision on how to advise you.

COPY/PASTE: This “Support Ticket” into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA

Strain; Type, Bag seed, or NA

Soil in pots, Hydroponic, or Coco?

System type?

PH of runoff or solution in reservoir?

What is strength of nutrient mix? EC, or TDS

Indoor or Outdoor

Light system, size?

Temps; Day, Night

Humidity; Day, Night

Ventilation system; Yes, No, Size

AC, Humidifier, De-humidifier,

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

Tag us when you provide the full info needed

PS buy a pH meter with pH up and down and 7.0 calibration fluid. Asap!

98% of the problems we see here are due to improper pH of water.

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Could just be normal yellowing due to the plant not using as much nitrogen but as @bob31 suggested if you could copy and paste that support ticket we can make more informed answer.

My current grow started yellowing early but the buds are still doing great.


That is excellent pheno expression the purple and colouring coming out is telling you things are going just right the yellowing is normal


I was going to say that it looks pretty normal to me. Remove them as they turn to prevent stress and disease and to promote good air flow and light transmission.



Strain: Feminized Grape Kush S1

Soil in pots

System type: huh? It’s in a tent.

PH: cheap soil stick says just under 7. Calibrating my ph pen this weekend.

What is strength of nutrient mix: FF trio never the full recommended dose.


Light system: 210 watt LED

Temps: Day-84 Night-74 (we average around 95 outside right now)

Humidity: Day; 45-38 Night: 45-50

Ventilation system; No

De-humidifier + Damp Rid bag

Co2; No

@Donaldj @Myfriendis410

Thanks for the reassurance. I’m going to keep my eye on her and continue to remove the dead leaves but hopefully there won’t be too many.

The tent has an inside circulating fan and an outside fan blowing cool air in but no ventilation out. When I harvest these in a month or so the next indoor grow will not be in a tent due to weather conditions.

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Just a few more questions @morganney
Under the white light they look really great other than those few leaves!

What kind of soil and what size/ type of pots

What is the pH of your water in and runoff?

FF Trio, are you following the FF Chart for feeding? How long ago did you start them?

The 210 watt LED what is the equivalent rating? The advertised wattage? How far are they away from the tops of the plants?

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2 gallon smart pots in happy frog soil.

Started FF trio since about 3 weeks according to their recommended schedule.

I think 210 is the equivalent but am not sure. I feel like the advertised was higher than what the manual says. 16in away from light.

I think I found the issue, well at least definitely an issue. Assuming I calibrated my pen correctly, ph of water in is 6.2 but ph of water out is 5.2. So, I’m thinking of adding some oyster shells I feed my chickens to the soil to raise the ph. Anybody ever try that?


I’ve never tried oyster shells. Hydrated Lyme works great or you could get some PH up and add that to your water.

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I don’t know about the shells and stuff but pH your water to like 6.7. make sure you do it after you add nutrients as the ff nutrients will make the water pH lower.

I forget how old your plants are but if they aren’t in flower your light should be higher, like 36 inches and down to 18-24 in flower but those numbers are for a 300 watt equivalent light. (But if the manufacturer says 16 inches just keep an eye out for light damage)

Also 2 gallon pots are gonna be too small. Autos indoor do best in 3 gallon pots. Photos and outdoors are 5 gallon minimum.

Hope this all helps? @morganney

I only use pH up and down.

Some update photos. These ph pens are a pain to keep calibrated. Anybody have any tips on the easiest way to calibrate these?

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I store mine in calibration solution so I know if they are out more than a point it is time to adjust them I also have digital meter so it is push buttom calibration and worth the extra few dollars

Yeah, I bought one with a digital calibration button yesterday. What exactly do you mean by store? You keep the pen inside the calibration solution with the cap off, or you leave the tip damp with the calibration solution before you place the cap back on (i.e. do not rinse with water before placing the cap back on)?

My PH pen has a sponge in the cap that is used to keep it moist. The instructions that came with it said to put a few drops of distilled water in the cap for storage.