Yellowing and dying leafs.

[Nickeo]

Hi folks, new member here and i am having some trouble with my two plants, its my first grow and i don't know whats wrong with them, i have followed good grow guides but still i am getting this problem, i will add some images of the plants, but basically the leaves are turning yellow and crispy and dying.

SOIL:

How long has this problem been going on?
Started about 1 week after is started to grow.
What STRAIN are you growing?
King Kush from Green house seeds.
What was the establishing technique? (seed or clone?)
Seeds.
What is the age of your plants?
3 Weeks.
How long have they been in the soil mixture they are in now?
Since the beginning.
Were they in the same mixture when they were seedlings/smaller plant? If not, what mixture were they in before?
Yes the same mixture.
How Tall are the plants?
first one is about 30cm and the other about 15-20 since its been closer to the light source.
What PHASE (seedling, vegetative or flower) are the plants in?
Vegetative
What Technique are you using? (SOG, SCROG etc)
Just regular grow.
What size pots are you using? (Include how many subjects to pot)
Regular plastic pots, 11 liters.
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
Gold Label, Special Mix, it came premixed with perlite.
What brand Nutrient's are you using?
No nutrients added yet since the soil was pretty nutrient rich.
How much of each nutrient are you using with how much
water? *Knowing the brand is very helpful*
No nutrients yet.
How often are you feeding?
No nutrients yet.
If flowering, when did you switch over to using Bloom nutrients?
Not flowering yet.
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
No nutrients yet.
What is the TDS/EC/PPM of your nutrients used?
No nutrients yet.
What is the pH of the "RUN-OFF"?
Haven't measured that im afraid.
How often are you testing pH/ppm/EC/TDS?
Never.
What method of pH test was administered? Using Strips? pH pen?
No tests.
How often are you watering?
Every 2-3 days.
When was your last feeding and how often are you feeding?
No feeding at the moment.
What size bulb are you using?
125W LE.
How old is your bulbs?
Brand new.
What is the distance to the canopy?
Lights are 20cm from the plants.
What is your RH Factor? (Relative Humidity)
50-55%
What is the canopy temperature?
I dont know, since its only Le its pretty low.
What is the Day/Night Temp? (Include fluctuation range)
28-30 at day, and 24-26 at night.
What is the current Air Flow? (cfm etc.)
Tell us about your ventilation, intake exhaust and when its running and not running ?
I dont know, i am using a passive intake of air, and a 100mm exhaust fan.
Is the fan blowing directly at plants?
I have a small fan blowing at the plants stem.
Is the grow substrate constantly wet or moist?
No, i let it dry out before watering again.
Is your water HARD or SOFT?
Afraid i don't know that.
What water are you using? Reverse Osmosis (RO)? Tap?
Bottled? Well water? Distilled? Mineral Water?
Tap water that i let out in room temperature 24houers before using.
If using tap water, what is the ppm/EC/TDS of the water right out of the tap?(Only if you have a tds pen)
I dont know.
If using RO,Distilled,mineral water, what is the ppm/EC/TDS without any additives?(Only if you have a tds pen)
Not using that.
Are you using water from a water softener?
No.
Has plant been recently pruned, cloned or pinched?
No.
Have any pest chemicals been used? If so what and when?
No.
Are plant's infected with pest's?
I don't think so, no sure.

Images of the plants.































The top leafs and the new leafs that are coming do not have these spots, but after a while they start to show on those leafs aswell, i have no idea whats wrong, please help

 

[bobman]

First off your plants looks great. do not make any drastic changes whatever you are doing is working. Bottom leaves do weird things. do not pull them off because if there is a problem it will advance up. it really looks like some sort of light bleaching but it weird because they are on the bottom. is the fan directly blowing on those leaves? that will cause that. just make sure you give them a good wet dry cycle. always look at the overall health of the plant and the vigor and new growth. its nothing major.

 

[Nickeo]

First off your plants looks great. do not make any drastic changes whatever you are doing is working. Bottom leaves do weird things. do not pull them off because if there is a problem it will advance up. it really looks like some sort of light bleaching but it weird because they are on the bottom. is the fan directly blowing on those leaves? that will cause that. just make sure you give them a good wet dry cycle. always look at the overall health of the plant and the vigor and new growth. its nothing major.

Thank you for the reply
I was just about to pull the leafs haha, ok so i will leave them on and see what happens.

The fan is blowing on those leafs yes, maybe its to close to the plants?, its just a few centimeters away, i got the plants back in the tent i will post some pictures of the fan blowing on them, maybe i should try and move it further away? :/

 

[bobman]

yes, eliminate that variable first, most likely the problem. like i said just watch them, they look healthy. new growth and vigor will tell the story and alert you if something is really wrong. you are well on your way good luck.

 

[RetroGrow]

First and most important:
You MUST find out your PH.
This is not an optional thing. Get a PH pen or at least the drops with the color coded vial. If PH is off, it causes all kinds of problems.
You have to monitor your PH throughout the grow.
Once your PH is known, then it is possible to diagnose any problems that might arise. Without knowing the PH, you are flying blind.

 

[bobman]

lets not get this guy chasing the ph issue. looks like he started with a good mix that was buffered already and he did not amend it with anything. If he is watering properly ph will not be an issue. as long as whatever he is giving them is not way out line which it will not be he will not have a ph problem.

 

[Ziggaro]

Ehh Im not familiar with that soil but I'm thinkin it might be too hot.

Those leaves show burning symptoms.

BTW tap water in my parts is dangerous to use on plants. You might want to look into that.. most areas have a public water report.
Mine starts at almost PH 9 with .6 EC. That kind of water alone can build up in a medium. I have a lot fewer problems since I went out and bough an RO.

 

[jonnybgood29]

listen to bobman, definately agree on this one. let them go and see what happens. looks like a possible nute issue, but only for when they were younger and the soil may have been a little hot then, but not now! looking great!

 

[bobman]

Ehh Im not familiar with that soil but I'm thinkin it might be too hot.

Those leaves show burning symptoms.

BTW tap water in my parts is dangerous to use on plants. You might want to look into that.. most areas have a public water report.
Mine starts at almost PH 9 with .6 EC. That kind of water alone can build up in a medium. I have a lot fewer problems since I went out and bough an RO.

To me the burns look more like light bleaching or wind burn. but it does look like a burn. overall they look vigorous so i do not think they would have made it this for if the mix was that hot.

 

[someotherguy]

For less than $10.00 you can get a ph test kit, just a small bottle of chemicals and a small, capped vial, not as accurate as the ph pen Retro advised but cheap, ...and accurate enough to tell you if you have an issue.

My municipal supply comes out of the tap at almost 8.0, and I often had leaves look like that before I started paying at least some attention to my ph.

...if your ph isn't within a certain range some nutrients get locked out, i'm no expert but I believe ph impacts ec in some way.

...just sayin'.

Peace, SOG

 

[Ziggaro]

Still looks like something might be building up in there.

One plant looks mostly fine, but the other shows big ridges and leaf curl on the newest growth, which looks like salt buildup to me.

"Special mix contains enough nutrients for almost a complete grow cycleif you don’t water with drain. If you water with 30% drain it contains enough nutrients for the first three to six weeks."

That sound like a REALLY hot soil. Being organic it also releases nutrients over time, which IME can build up. Happens with FFOF. Happens with Sunshine Mix. Those aren't even advertised to be this strong!

 

[bobman]

Honestly I am surprised the op has not had more problems. He did not amend with any extra perlite. That soil is probably pretty heavy and if those containers are really 2.5 gallon then he must have been real good about watering. I mean real good for a beginner. Good job op on the watering, wet dry cycle is the most important thing for a small plant in a big container.

 

[RetroGrow]

For less than $10.00 you can get a ph test kit, just a small bottle of chemicals and a small, capped vial, not as accurate as the ph pen Retro advised but cheap, ...and accurate enough to tell you if you have an issue.

My municipal supply comes out of the tap at almost 8.0, and I often had leaves look like that before I started paying at least some attention to my ph.

...if your ph isn't within a certain range some nutrients get locked out, i'm no expert but I believe ph impacts ec in some way.

...just sayin'.

Peace, SOG

Yup. PH definitely important. My tap is 8.9.....

 

[RetroGrow]

Still looks like something might be building up in there.

One plant looks mostly fine, but the other shows big ridges and leaf curl on the newest growth, which looks like salt buildup to me.

"Special mix contains enough nutrients for almost a complete grow cycleif you don’t water with drain. If you water with 30% drain it contains enough nutrients for the first three to six weeks."

That sound like a REALLY hot soil. Being organic it also releases nutrients over time, which IME can build up. Happens with FFOF. Happens with Sunshine Mix. Those aren't even advertised to be this strong!

It sounds like he is using "Royal Gold Mendo Mix. Just a guess, but I have used it and it is a premium soil, but a bit hot for seedlings.
Couple that and the fact that he is using tap water without knowing the PH, and you have potential problems, ie, a slight burn or lockout.
Here's a link to the Gold label Mendo mix:

http://royalgoldcoco.com/mendo-mix

There is no reason to ignore PH.
I'm pretty sure every grower on here checks his/her PH.
Seedlings will grow out of early burn from hot soil, but PH problems will haunt you throughout the grow.

 

[bobman]

Haunt is a strong description man. why do you want to scare someone like that. i have yet to see one plant, in the infirmary, grown in soil where ph was the real cause of a major problem. Bad watering technique or root bound plants show symptoms that look like ph and ph may be the issue but its not because of whats put in but because the roots can not uptake water/food properly and things get out of whack. There is no reason to send a new grower chasing a ph problem when there are simpler variables to control first.

 

[grapeman]

Haunt is a strong description man. why do you want to scare someone like that. i have yet to see one plant, in the infirmary, grown in soil where ph was the real cause of a major problem. Bad watering technique or root bound plants show symptoms that look like ph and ph may be the issue but its not because of whats put in but because the roots can not uptake water/food properly and things get out of whack. There is no reason to send a new grower chasing a ph problem when there are simpler variables to control first.

This is bad advice. Of course you need to know your ph. The only time ph becomes more or less moot is when the soil is built properly and organically.

 

[bobman]

i disagree. there are much bigger problems facing new growers. telling every new grower to chase ph is much worse advice. if your soil is buffered and you water properly you are not going to have a ph problem. show me one soil ph problem in the infirmary. not trying to be a dick i just come in here and see everyone ask what is ur ph and do this and do that and every time its not ph it how they watered or the plant is root bound.

 

[Nickeo]

Thanks for all the replies

The soil i am using is this one, i wasnt 100% clear on that.
http://www.specialmix.nl/index.php/en/substrates/special-mix.html

Just to be safe i bought one of those ph/ec pen thingies, will arrive in a few days so i can try it out.

The lights will turn on in my growroom soon so that i can see if moving the fan away has had any effect yet.

I also noticed that some of the perlite have turned yellow, also that the water that have been runing trough the soil and onto the plate that the pot is standing on have left yellow deposits, maybe its just some of the nutrients in the soil?, i have no clue :/

Maybe i should also try and add some more water when watering the plants?

Will update with some pics later today, take care folks.

 

[bobman]

in soil changes take longer not that would make a difference with the fan but dont expect an over nite change for any problem. dont worry about the perlite its probably from the calcium in the water. you probably have hard water. gettting the meter is good to learn water but soil acts as its own buffer and filter. you will know a lot more about your water which is good.
keep the watering light until those plants get bigger.

Also take notes on the water and how it is effected by letting the water stand for a period of time with and without nutes. those pens can get a little wacky after a short period time. are they sending adjustment solutions and if so how much?

 

[Ziggaro]

i disagree. there are much bigger problems facing new growers. telling every new grower to chase ph is much worse advice. if your soil is buffered and you water properly you are not going to have a ph problem. show me one soil ph problem in the infirmary. not trying to be a dick i just come in here and see everyone ask what is ur ph and do this and do that and every time its not ph it how they watered or the plant is root bound.

you probably shouldn't be in the infirmary helping people if you don't understand how important ph is
nothing bothered me more when I was new than people telling me my obviously damaged plants were fine and not give any real advice.

if he was happy with his plant health he wouldnt bother posting now would he?

And if you're suggesting you can dump anything into soil without knowing ph you're wrong.



BTW OP next time cut that soil your plants will grow faster. you might want to start in smaller pots too
the yellow on perlite is moisture stress (too much)