please help me diagnose this problem

AGAIN, they look hungry, what are you feeding them, and at what strength?

Coco you want a lower ph than soil, I have always read that 5.5-6.5 is appropriate ph for coco but the ideal range is probably 5.8-6.2, which is more or less the exact range my feedings are in whether I add nutrients or not.

I am getting fresh water from the tap every time I feed, it isn't sitting in a reservoir. I actually have a rez and airstone which I got to save me time mixing up nutes every damn day but still have not set it up yet. I have two indoor harvests under my belt varying between .6 and .7 grams per watt and I never once had to aerate my water when using it fresh. I am not trying to boast about those numbers btw because I know MANY would put them to shame, but from everything I have read they are not bad for someone who is relatively new to this game, and my point is if air in the water was an issue I should never have pulled down those harvests...

Chuck, I feed them with a line of nutrients called Nutrifield, I give full strength nutrients according to the chart for what they should be fed in veg. Last time I ran these genetics the nutrients were adequate, I actually managed to burn my Kosher Kush a little bit half way through flower and will be taking it a bit easier on the nutrients in flower this go round.

I think maybe my plants are not getting fed well because the cold floor is stopping them taking up nutrients? This grow is in a garage and it has been cold here lately. I use coco precisely because I have read that it insulates the roots from outside temps much more effectively than coco. I managed to do a grow all through last winter though and never had any problems like this.

even if he fed 1/4 stengrenth 6 days ago he's sill not going to show a deficiency on a young plant ever especially like that... but he said he fed them six days ago and i assume it wasn't 1/4 strength.. they aren't hungry.... my god... people he just said his plants are on a cement slab with one thin layer of carpet... the soil isn't drying properly its staying wet and way colder than it should be... he isn't PH balacing the nutrients .... and you guys all run to freaking deficiency and he's not feeding enough!! id love to see peoples grows that are giving all this advice

yes cold floors will slow nutrient uptake absolutely but feeding more isn't going to solve it they need to be raised off the floor 3" i used milk crates in the winter spring and fall in michigan..

the soil needs to FULLY DRY between watering..raise them off the cold floor.... you raise your ph to 6.3 even and water every other to every three days your plants will completely change.

What is the best way to warm up my grow medium? I have one of those seedling mats I could use, but from memory they don't get too warm.

I have been meaning to get a drainage tray for a couple weeks now, would having that elevated off the floor so I can stick a container under it to collect run off and placing the plants on the tray solve my problem?

i keep saying soil i know you use coco i should say media..... sorry

the best way is buying infrared heaters they heat objects not just air

thats for a larger room

smaller cups or pots if you don't have a lot i would use a heat mat

You are on to it I reckon Phil, I will get the drainage tray ASAP, let the grow medium dry out good and proper and go back to full strength nutes with a good wet/dry period.

you have water in a tray that they sit in???

Would raising them off the floor or using a heating mat be preferable? Assuming that I could do either but doing both at once would be impractical.

man that water PH is probably in the 5.0 or lower if your plants roots are touching ghat stagnant water thats a big issue

i would put something under them anything plastic.. i used to use 1" foam when i had nothing else ... milk crates are best

No, currently I run drain to waste and getting rid of the waste is a very tedious process. I wanted to purchase a dranaige tray, the kind that you have all your plants sit on and when you water them, the runoff goes down the tray and through a hole into a container underneath the drainage tray, so then you can pull the tray out and dispose of the run off.

They are not sitting in water, I don't leave them sitting in stagnant water.

phil k said:

yes cold floors will slow nutrient uptake absolutely but feeding more isn't going to solve it they need to be raised off the floor 3" i used milk crates in the winter spring and fall in michigan..

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I missed the cold floor part, BUT, you just confirmed MY diagnosis, they ARE hungry from slow uptake from the cold floor. So, I guess i wasn't that far off. MEH!!!

Thanks for your help though Phil, do you think if I purchased the drainage tray as soon as I am able (day after tomorrow) so that they are raised off of the floor, and let the grow medium dry out for a good 4 days or until it is bone dry, then I should be able to resume feeding and my plants will regain their health?

don't get into that without a meter... stick with coco and watering the plants. don't keep run off in a tray.. i may not be understanding that well enough.. to me it sounded like you have the plants in a tray that tray they sit in also keeps the runoff until you dump that runoff out.... thats how i read it... sorry if I'm wrong.

chuck estevez said:

I missed the cold floor part, BUT, you just confirmed MY diagnosis, they ARE hungry from slow uptake from the cold floor. So, I guess i wasn't that far off. MEH!!!

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HAHAHAH i almost said the same thing... look I'm not truing to be this jerk.. but its not a deficiency... and thats always the first thing people run to without knowing anything about what he's doing ... i mean it comes to something as stupid as a cold floor really starting all this but he would have been told its deficiency and thats that..uness someone actually talked to him to figure it out properly. everything is solvable and RARELY AS FUCK do you get deficiencies or underfeed.