Thought it was heatstress, then under watering, now.....Nitrogen Toxicity? ( Pics )

My plants took a sudden nose dive. Becoming very limp 3 days into flower. I thought it was heat stress cause the cab got to 89 one day.....however many of you said that 89 isnt THAT hot....so then we thought under watering...I hit them with some water and they perked back up a little....but this morning I woke up to the same lifeless plants...
http://i.imgur.com/VNhQP.jpg
http://i.imgur.com/SlVF6l.jpg
So im thinking perhaps nitrogen toxicity? I am cutting all nutes out of the equation until the bounce back, but anyone have any other thoughts?

To me this looks like heat. You'll know if it is because your grow room will be ........... hot.

Also, do you have fans and ventilation?

EDIT: Defo not N toxicity!

Are you sure that the soil is taking in moisture. I had a similar problem once with tomato plants that I had put in cheap potting soil. It got to the point that it wasn't absorbing water. I would gently remove the plant from the pot being careful not to disturb the roots and see if you can determine what's going on from there.

what makes you say that? Looks like classic N toxicity no? clawed leaves? dark leaves?

I thought 89 was hot but the general concecious was that it was not hot ENOUGH to cause that kind of dammage.

were in a scrog, so i dont see how i could remove the plants without causing extensive damge.

hmmm...curled under skinny leaves like that is usually overfed in my experience with my plants...a hot plant will cup it's leaves up to try and hold whatever water it can...although extreme heat will cause wilting as the plant tries to cool itself...it could just be overwatering that has caused some overfeed too...but stop with the nutes and only water next when the pot feels totally light...not a little, but a lot...

On another note I had 2 tomato plants inside that were doing great, great, great, and then the little flowers would curl up and die and the whole thing would fall off instead of just the petals...so the plants stopped making tomatoes...I fed them, no change...I looked for bugs, there were none...I gave up and buried them in the ground outside and they like quadrupled in size and have become some monster plants covered in tomatoes because the flowers stopped just falling off...I mean they are falling off leaving the stem intact enabling a tomato to grow...I don't know what was going on...I mean I made sure to shake them so they could pollinate and I have good ventilation, and none of my other plants have had any sort of issue like this, but those damn tomatoes...they look amazing now outside, but inside they were dying man...I don't know why...but as long as nothing else gets it I don't care...I can move tomatoes into the garden....anyway this whole story is not mj related..but it is a case of I don't know what the Fuck was happening...! still

Its so obviously heat stress/ lack of water.... The dude already stated he thought as much...... look at the leaves in the pic. Very similar to the leaves of a wilted lettuce left in the sun.

Spray immediately with water, give cool fresh air, 50% feed .../. In less than 24hrs they'll be looking great.

heat stress usually shows itself as leaves curling UP? right?

dxfan227 said:

heat stress usually shows itself as leaves curling UP? right?

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It depends if water is still left in the plant when the stress happens. Plants left underwatered through excessive heat droop. Picture what happens to a lettuce leaf without water.

Heat and not enough water. Happens to my clones about once a month when I get lazy n decide to smoke too much pot. They will drop when their dry like that, or if it's too hot it'll start to curl inward on itself making the leaves look like finger straws or some shit.

do you consider 89 excessive heat?

missnu said:

.....snip.....
On another note I had 2 tomato plants inside that were doing great, great, great, and then the little flowers would curl up and die and the whole thing would fall off instead of just the petals...so the plants stopped making tomatoes........snip......

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If you want to try again indoors this should allow you to get fruit.
http://www.gardeners.com/Vegetable-Blossom-Set-Spray/34-444,default,pd.html

OP I don't think it's heat either but I'm a real newbie. I do not air condition and live in the desert so my plants are getting hammered with heat. My plants are in soilless, Sunshine Mix #4, and they develop a hard pan on top so you have to cultivate the top a bit so the water doesn't flow down the sides of the pot not watering the plants, at least that was my experience. You can take a knitting needle and poke a few holes in the soil or you can use a wetting agent like Synthrapol or plain dish soap (not dishwasher detergent), but you want to add very little, just a drop or two will work.

I would hit them with some silica so they can start taking longer periods without water, an also be able to take the higher temps. My indoor doesn't hit over 81 and doesn't go under 77. Outdoor is another ball field with unlimited air flow and ventalation that's why they can take 90+ temps in mid summer. The reason why some people's plants can take it an yours can't is because they need to be slowly introduced to that environment. When temps jump around drastically it can also help shock up the plant an slow growth.

But those type of temps are gonna cause your buds to be airy anyways, you should try to hit atleast 85 if you can.

I have seen higher temps with fewer side effects...
is it just the top growth that is curly, or is some yellow lower down, or is the lower growth fine? if the top looks like this while the rest looks fine then it is heat...but if the whole plant is starting to curl it's leaves it isn't heat...

Ive had full plants curl up like that from heat and no water, mainly no water will cause your leaves to droop, the curl is more commonly caused by heat. In winter when I forget to water my girls they just droop. In summer the leaves curl inward. I learned my mistakes after loosing a couple batches of 40+ fully rooted clones.

dxfan227 said:

do you consider 89 excessive heat?

Click to expand...

A thermometer can only measure the temps around its probe, even then its accuracy is questionable and can vary with models. Dont rely on them.

Much better to visit your growroom at its hottest. Put the back of your hand at the level of the plants. If its at all uncomfortable for your hand it will be for your plant.

I try and keep my plants in an environment that wouldnt kill a new born baby child. lol

ph runoff was at 7 or so...too high for soil is is that ok? its neutral right...ughghghg why are they dieing@!