Entire plant is yellow

Hey guys i'm using a secret jardin ds120W with a 400w bulb. Distance from plants is great, humidity is great, temperatures are great. Im using dutch treat potting soil and miracle grow with some pro mix. It is not a slow release fertilizer. I use general hydroponics 3 part micro, grow, and bloom. I have only ever used these nutrients and have had zero problems. I got some clones from a buddy that were doing just great but have slowly turned yellow all over the plant. They are the taller ones, about 2 feet @ 6 weeks. Some rockstar seeds that ive grown out have done the same thing, yellow and they have little brown spots all over the fan leaves. Ill post up some pics here. Anything would help me. I have NOT flushed these plants to try to remedy the problem. The last piece of information is, for the first few weeks of these plants growth cycle my attic dipped as low as 35 degrees fahrenheit. For like 2 weeks. Looks like maybe nitrogen or calcium deficiency to me. Anything will help!

What pH?

Shit my bad. I regularly test my nutrient solution to anywhere between 5.5-6.5, i use the GH drop test pH indicator or whatever its called. The runoff from the pots tests the same as i water with, usually around 5.8

They look like there are exhibiting signs of moisture stress.

Overwatering.
Let them pots dry out.

Sir KK

docter said:

They look like there are exhibiting signs of moisture stress.

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Moisture in the root zone or just overall too humid..? Whenever i open the zipper my gauge is just on the brink of teetering into the "too dry" zone but ill let the soil dry up a bit more and leave a vent open for you buds. Thanks man

There is definitely signs of over watering occurring. It's easiest to judge when to water by using the weight of the pots. When the pot feels light, give them a good watering and allow for runoff. In soil, a pH of 6.3-6.5 is preferable, less in hydro. Some people swear by the drops, but a digital pH meter is definitely a good investment. I like the HM PH-200 myself, but different strokes for different folks. The brown spots may indicate a lack of Calcium, so 3-5ml of CalMag per gallon of water should prevent future spots from occurring, although those affected leaves will likely not recover. As for the yellowing, try flushing to get the pH up to 6.3 and next feeding, use nitrogen rich nutrients. Also what size pots are you in?

I say you water it some more.

are you also misting them?

NewBean said:

There is definitely signs of over watering occurring. It's easiest to judge when to water by using the weight of the pots. When the pot feels light, give them a good watering and allow for runoff. In soil, a pH of 6.3-6.5 is preferable, less in hydro. Some people swear by the drops, but a digital pH meter is definitely a good investment. I like the HM PH-200 myself, but different strokes for different folks. The brown spots may indicate a lack of Calcium, so 3-5ml of CalMag per gallon of water should prevent future spots from occurring, although those affected leaves will likely not recover. As for the yellowing, try flushing to get the pH up to 6.3 and next feeding, use nitrogen rich nutrients. Also what size pots are you in?

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They're all in 5 gallon pots and have been for (basically) their entire life so far. I will definitely try flushing and readjusting to above 6.0 pH. I learned how to test pH from a really old school grower, and yes he does swear by the drops haha. Thank you guys a lot really, i feel like it may be a combination of cold from the last temperature drop, moisture levels from over watering and an incorrectly adjusted pH. Yes i mist these girls twice a day once with lights on once with lights off. Foliar feed 1/4 strength recommended dosage once per week after lights out. Thanks again guys. I will update if these things help my plants.

f00kst3r said:

They're all in 5 gallon pots and have been for (basically) their entire life so far. I will definitely try flushing and readjusting to above 6.0 pH. I learned how to test pH from a really old school grower, and yes he does swear by the drops haha. Thank you guys a lot really, i feel like it may be a combination of cold from the last temperature drop, moisture levels from over watering and an incorrectly adjusted pH. Yes i mist these girls twice a day once with lights on once with lights off. Foliar feed 1/4 strength recommended dosage once per week after lights out. Thanks again guys. I will update if these things help my plants.

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Ur plants r over watered and hungry for nuts is my guess if they was mine I'd flush ea pot 20 minz then I'd make a medium nuts mix and flush that through ea plant then I'd let pots fully dry no water 5 days

f00kst3r said:

They're all in 5 gallon pots and have been for (basically) their entire life so far. I will definitely try flushing and readjusting to above 6.0 pH. I learned how to test pH from a really old school grower, and yes he does swear by the drops haha. Thank you guys a lot really, i feel like it may be a combination of cold from the last temperature drop, moisture levels from over watering and an incorrectly adjusted pH. Yes i mist these girls twice a day once with lights on once with lights off. Foliar feed 1/4 strength recommended dosage once per week after lights out. Thanks again guys. I will update if these things help my plants.

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dude!!ph MUST BE above 6 in soil...stop misting and foliar feeding them.let em completely dry,and give it some nutes,like 1/2 strength..and see what happens!thats just my noob oppinion

What? Don burn em wit nutes jus let them dry. Overwatered plants dont take in nutes. There roots get all swollen. Eventually leading to rot. They just need air.

Sir KK

Careful with late night foliars. High humidity at night will cause mold. If yur spraying with lights off, i suggest 15min before lights come on or 15 min before they go off.

Sir KK

Kush Killington said:

What? Don burn em wit nutes jus let them dry. Overwatered plants dont take in nutes. There roots get all swollen. Eventually leading to rot. They just need air.

Sir KK

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Do you understand how osmosis works?......
Bet a 250w hps that running/maintaining 1,800 ppm in the root-zone of a small/medium over-watered plant still severely burns or kills it.

The roots getting all swollen and leading to rot has nothing to do with the nutes and everything to do with over-abundance of water, lack of oxygen, and bacterium/fungi colonies.

Burns are common in over-watered plants because they aren't thirsty and as a result take up more nutes than fresh water. Most of the nutes sit and cook the roots. Osmosis is occurring while the ppm's are uneven, in this case causing excessive (albeit slow) nute UPTAKE. Regular watering just doesn't end up lowering the tds quick enough.
Sorry for shoddy explanation lol.



They do need to dry for a bit though. And they are hungry. Choose your own technique to deal with this OP. Also "little brown spots" sounds to me like a K or Mg problem, either abundance/lockout or deficiency.

Kush Knight said:

Burns are common in over-watered plants because they aren't thirsty and as a result take up more nutes than fresh water. Most of the nutes sit and cook the roots. Osmosis is occurring while the ppm's are uneven, in this case causing excessive (albeit slow) nute UPTAKE. Regular watering just doesn't end up lowering the ppm quick enough.
Sorry for shoddy explanation lol.



They do need to dry for a bit though. And they are hungry. Choose your own technique to deal with this OP. Also "little brown spots" sounds to me like a K or Mg problem, either abundance/lockout or deficiency.

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..hm i thought nute burn was from high salinity causing a reverse osmosis effect in the root zone. Overwatered plants wudnt take in water and thus wont take in nutes. So they build up around the roots causing burn. Feeding/watering wud cause damage until moisture levels normalize throughout the system.

...so, overwatering, which is not underfeeding, confuses people into thinking there plant is thirsty/hungry (cause of yellowing/droopiness associated with overwatering) and thus they both feed and water compounding there issues.
I merely was saying that feeding/watering is not what they need to be worrying about atm. Need to let them roots breath and establish a proper watering routine to avoid the looming rot.

Sir KK

Kush Killington said:

..hm i thought nute burn was from high salinity causing a reverse osmosis effect in the root zone. Overwatered plants wudnt take in water and thus wont take in nutes. So they build up around the roots causing burn. Feeding/watering wud cause damage until moisture levels normalize throughout the system.

...so, overwatering, which is not underfeeding, confuses people into thinking there plant is thirsty/hungry (cause of yellowing/droopiness associated with overwatering) and thus they both feed and water compounding there issues.
I merely was saying that feeding/watering is not what they need to be worrying about atm. Need to let them roots breath and establish a proper watering routine to avoid the looming rot.

Sir KK

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Osmosis usually works both ways. The roots are the semi-permeable membrane. In osmosis the solids do the moving ( to balance out the water on both sides of the membrane.
So if you factor osmosis solely,
when an over-watered, slightly underfed plant gets fed, the nutes in the soil will move (no water consumption) into the plant. Since no water is absorbed, the concentration of nutes in the cells skyrockets.
When an overfed over-watered plant has less nutes in the soil,you get the beginnings of a flush.

When its thirsty you have to factor additional water consumption, so nutes will almost always flow into the plant. That's why instructions always say feed when the plant is thirsty (soil is dry).

Hm. Fosho fosho. Thanks fo the knowledge

Sir KK

Wow thank you guys so much! I'll up the nutrient solutions to half strength and over 6.0 pH. Also, will let them dry out as ive already done first flush. Thanks guys.

over watered is my guess. the yellowing can be caused by that sometimes too with lockout