What's going on with my White Siberian?

I watered 2 days ago and my White Siberian is looking sick. Only watering 6.0-6.5 ph water right now.

• I am growing in a 4x4 tent with a 600w mh bulb.
• 6" inline fan hooked up to a carbon filter pulling air out with one flap open in the back of the tent.
• One fan inside the tent moving air around.
• Temp sits at about 25.5-26.5C degrees with the light on, and 20-21C with the light off.
• Running between 50-60% humidity.
• Soil is Fox Farm Ocean Forest.
• Currently on week 3 from seed germinating.

I also have 2 master kush plants in the same tent that look absolutely fine(3rd pic is the master kush).

it looks like heat/vpd problem to me but your temps/RH looks good.

could the light be too close?

pulpoinspace said:

it looks like heat/vpd problem to me but your temps/RH looks good.

could the light be too close?

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That's what I originally thought - But the light is about 4ft away(at the top of the tent). I'm thinking maybe I need a bigger fan? 8"?

It’s not light based on your 2nd post.
Probably not heat either with lights 4 feet away from a start like that and 27° at your thermometer.
Water?
Soil?
Roots?
I’m thinking below, not above the ground, based on the light/temp.

Epson salt is your friend...she's looking short on Mg. Good luck

Update: I tried supplementing some Cal Mag and nothing, The white widow has gotten worse and the Master Kush is now showing the same signs. Please help! I noticed that now with the warmer weather my basement is getting warmer so the inside of the tent has seen temps close to 28.5 degrees.

Is it possible that this is light stress? I should mention that the White Widow showed these same signs when they were only 2 weeks old after watering but still seemed to grow.

The kit that I purchased has an oversized hood - Could this cause light stress?

I have that version with the upgraded 600W light and 6" inline fan/filter. As I said the light is at the top of the whole tent so I can't really move it further away? Should I be getting a small wattage bulb? 400W? or LEDs?

Here is the tent setup - The hood is all the way at the top.



Here is the Master Kush starting to show the same signs - Light stress or Heat Stress? Something else?





Here is the white widow looking really grim


Any help is appreciated. My plants are dying

I think you are kinda wasting watts. In my experience plants just love flourescent lights until they are 12 " tall. I never used Ocean Forest and people's experience seems to vary, some say it's way too hot and some say it needs more feed after 3 weeks. Yours seem to be slightly over ferted. I would bath them in flourescent light and deiinitly don't feed them.

if you have 28.5C temperature your humidity should be 60%+

if you have low humidity and high temps it could be causing stress.

i agree to reduce light if you can. can you dim your ballast?

pulpoinspace said:

if you have 28.5C temperature your humidity should be 60%+

if you have low humidity and high temps it could be causing stress.

i agree to reduce light if you can. can you dim your ballast?

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Ah that could be - My humidity is around 50%. My ballast can switch down to 400 or 250W - Can I still have my 600W bulb in there and set it to 400W without any issues? Would this reduce the light output and heat? Sorry for my ignorance - this is my first indoor grow.

CannaCountry said:

Epson salt is your friend...she's looking short on Mg. Good luck

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White strains in particular are Mg hogs. I grew WW full time for 3 years and I know. Either you aren't giving enough Mg or it's getting locked out. Use foliar Epsom salts for now and see what that does. I'll bet we're correct.

When I grew the Widow...I used 1/4 tsp ES per gallon maintenance. For a deficiency...you want 1 tsp/gal. But use foliar for now in case there's an absorption problem. You will see results in a day or two.
JD

regd87 said:

Ah that could be - My humidity is around 50%. My ballast can switch down to 400 or 250W - Can I still have my 600W bulb in there and set it to 400W without any issues? Would this reduce the light output and heat? Sorry for my ignorance - this is my first indoor grow.

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yes! you can dim your ballast with your 600w bulb. it will run at lower wattage.

what you cannot do is run it at 600w with a 250w or 400w bulb that will blow the bulb out.

pulpoinspace said:

yes! you can dim your ballast with your 600w bulb. it will run at lower wattage.

what you cannot do is run it at 600w with a 250w or 400w bulb that will blow the bulb out.

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Great! Thanks for your comment. I will reduce to 400W and see if that helps.

JohnDee said:

White strains in particular are Mg hogs. I grew WW full time for 3 years and I know. Either you aren't giving enough Mg or it's getting locked out. Use foliar Epsom salts for now and see what that does. I'll bet we're correct.

When I grew the Widow...I used 1/4 tsp ES per gallon maintenance. For a deficiency...you want 1 tsp/gal. But use foliar for now in case there's an absorption problem. You will see results in a day or two.
JD

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Okay, I will pick up some Epson Salts and give it a shot. Thanks for your comment.

After doing a ton of more reading I just flushed one of my plants, my water here has a ph of around 7.10 and the water runoff was 4.5! This whole time I've just been phing the water to 6.0 - 6.5 and then watering and wasn't testing the run-off. Should I flush everything?

regd87 said:

After doing a ton of more reading I just flushed one of my plants, my water here has a ph of around 7.10 and the water runoff was 4.5! This whole time I've just been phing the water to 6.0 - 6.5 and then watering and wasn't testing the run-off. Should I flush everything?

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Soil runoff pH is not accurate. Fox Farms is an organic soil. You don't know what you're actually flushing out of it. What have you been feeding them? That last picture is nute burn. 6.0 is too low for soil.

xtsho said:

Soil runoff pH is not accurate. Fox Farms is an organic soil. You don't know what you're actually flushing out of it. What have you been feeding them? That last picture is nute burn. 6.0 is too low for soil.

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I haven’t fed anything. Only 6.0-6.5 ph’d water going in. My water here is 7.5-8.0 out of the tap.

regd87 said:

I haven’t fed anything. Only 6.0-6.5 ph’d water going in. My water here is 7.5-8.0 out of the tap.

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Interesting. Sure looks like nute burn but also other issues as well.

When you pH your water what are you using to test it after you adjust it? Is it possible that what you're using to test the pH when you lower it is not accurate? Maybe you think you're only lowering it to 6.0 -6.5 when it fact you're dropping it much more? That would cause some serious issues if you were actually watering with water that was closer to 5.0

To get a more accurate test of soil pH than by testing runoff you want to do a slurry test. Mix a 1:1 ratio of soil and distilled water. Mix it up and let it sit stirring occasionally. Ideally you'll want to let it sit for 24 hours before testing. But then it comes back to what method you're using to measure the pH. Do you have a meter? Is it calibrated? Are you using the drops? Are you sure you're matching the color correctly? I prefer meters because peoples eyes are not all the same to match colors. The 7.1 pH you say comes out of your tap is better than lowering it too much. In fact that's about what my tap water is and I don't pH when growing in soil. So do many other soil growers. That's better than lowering it too much. What are you using to lower the pH?

It's obvious something is going on but it could be a combination of multiple things. Could be a hot batch of Fox Farms. Could be you were lowering the pH of the water too much. I don't see how you it could be an Mg deficiency since the plants are small and you're in decent soil that should carry those plants for at least the three weeks they've been growing. Is the soil new or is it reused? In that last picture the clawing and dark green is what made me say nute burn.

xtsho said:

Interesting. Sure looks like nute burn but also other issues as well.

When you pH your water what are you using to test it after you adjust it? Is it possible that what you're using to test the pH when you lower it is not accurate? Maybe you think you're only lowering it to 6.0 -6.5 when it fact you're dropping it much more? That would cause some serious issues if you were actually watering with water that was closer to 5.0

To get a more accurate test of soil pH than by testing runoff you want to do a slurry test. Mix a 1:1 ratio of soil and distilled water. Mix it up and let it sit stirring occasionally. Ideally you'll want to let it sit for 24 hours before testing. But then it comes back to what method you're using to measure the pH. Do you have a meter? Is it calibrated? Are you using the drops? Are you sure you're matching the color correctly? I prefer meters because peoples eyes are not all the same to match colors. The 7.1 pH you say comes out of your tap is better than lowering it too much. In fact that's about what my tap water is and I don't pH when growing in soil. So do many other soil growers. That's better than lowering it too much. What are you using to lower the pH?

It's obvious something is going on but it could be a combination of multiple things. Could be a hot batch of Fox Farms. Could be you were lowering the pH of the water too much. I don't see how you it could be an Mg deficiency since the plants are small and you're in decent soil that should carry those plants for at least the three weeks they've been growing. Is the soil new or is it reused? In that last picture the clawing and dark green is what made me say nute burn.

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I’ve been using a digital ph meter and I believe it is calibrated. I have some buffer solution to re-calibrate.

Is it possible I just didn’t start feeding them nutes in time? I was reading a journal of someone also growing in FFOF and they noticed similar symptoms around day 19 and started feeding nutrients

I picked up an air cooled hood today so my temps in my tent are only around 23-24 degrees. Now I can officially rule out heat. Humidity is also up to a constant 60%.

Will the leaves turn back to their original colour if I fixed the issue or do I have to wait for new growth?

I’m thinking I should start feeding my nutrients I have the fox farm trio and cal mag+ to start feeding.

Its strange. Ocean Forest should carry those plants for at least three weeks without any deficiencies and if you haven't fed anything you shouldn't be having nute burn so I don't know what's going on. If I had to guess I would say that you lowered the pH much lower than you thought when watering. What kind of pH meter are you using? How old is it and how have you been storing it? And yes you should re-calibrate it.

Yes that’s what I heard the Master Kush was flawless until just under three weeks. They are now 4 weeks old. The white Siberian I had issues with since they were only 2 weeks old. I’m using a Rozway digital ph meter I got off amazon for $25 - so it’s definitely not top quality. It’s brand new so I’ve only used it for maybe 2-3 weeks. Storing it with the cap on in my grow room.

pulpoinspace said:

yes! you can dim your ballast with your 600w bulb. it will run at lower wattage.

what you cannot do is run it at 600w with a 250w or 400w bulb that will blow the bulb out.

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Depends on ballast. Some you dim and some you actually switch bulbs.

Dimming hid is not good. It changes spectrum and is hard on bulbs.