HELP!! Dying, Curling Leaves. Help me save them!!!

Hi there everyone. Im a new user here, and Ive been having a very rough time with these plants. They were started outside, and have been doing quite fine for the first month or so of their lives. Now however there is something seriously wrong that seems to be hitting one plant after another.

It mainly seems to be affecting the top growth. The top set of large leaves beings to curl upward and downward at the same time, with the tips curling the most, in some cases curling in several loops back towards the plant. Then the leaves will start to turn yellow, to gray, to brown, then they die. The new shoots of growth also have their tips seemingly dead.brown or at least very yellow.

I have been checking the PH with a liquid kit and it appears to be steadily between 6-6.7 (A new test just done of the freshly watered soil reads 6.4). With my PH test kit also came test for N-P-K (liquid, same method as PH test) and the NPK tests lead me to believe I am N and P deficient but seem to be overdosing the plant in K (which doesnt make sense as Ive been using 18-20-20 plant food at 1/2 strength about once a week) I started out using Miracle Grow potting soil in peat pots, but have now transplanted them to 6inch pots with 50% Sta-Green Potting Soil w/ Slow Release Chleated Nitrogen. I have been watering with Filtered water only, yet the plants dont show much signs of improvement. Actually the opposite.

It may hep to point out that, except for the past 6 days, the past 2 weeks or so it has been extremely hot outside. Temps in the 90's with EXTREMELY high Humidity. Many of the Plants that had problems appeared to be holding water in their peat pots longer than the ones that seems healthy. Could this be due to the high humidity? Did I drown them?

Anyway here are some pics:
Pic#1: A view of the leaves curling up and down at the same time.
Pic#2: Lower leaves on the most dead plant. Seems to spread to lower leaves after 1 week or so.
Pic#3: Good view of dying tips new growth
Pic#4: My dominantly-Indica baby showing dead new growth/curling top leaves
Pic#5: A Perfect example of how the leaves looked the first day there were problems. (Note they dont look like this anymore)

WHAT IS HAPPENING!?!?!

Any ideas or info is greatly appreciated. Should I flush them? Are they deficient or is it overfert? Im completely stumped.

Thanks for the help

Here are some more pics. I could only upload 5 in the first post.

Hope these help.

BTW the 2 plants that look like death, only seem to be affected in the leaves. The stem of the plant is very strong, and the leaves emerging from the nodes do not seem to be affected.

Pics:
Pic#6: Better view of the browning turning white/dead
Pic#7: Tips of one of the healthier plants dying
Pic#8 & 9: One of the ones that I dont think can be saved. (What is happening here?!)
Pic#10: This one is very healthy looking, except for the strange white spots. I thought it might be salt buildup, but it doesnt wipe off.

I wonder if the "slow release" nitrogen is killing off your plants. I would figure it has to be one of three things.

1. Wrong soil
2. Overwater
3. Too much heat

I pick the first one based on the info you've given here.....for one thing you say it's happening to your plants over and over so it's something you are continually doing. I think that lets out the heat (JUST GUESSING) and it just plain looks like overnute burn to me.

The only way I know how to fix something like that (without being able to pinpoint the exact problem) is to change things one by one and see how your plants react. I'd start with the easiest thing first.....change watering schedule perhaps? Or move from the sun and heat into the shade? See what helps and what doesnt. (this is one of the things about soil....the time it takes to figure this stuff out...)

My gut feeling is that is your soil (the words slow release make me shudder)

Good luck.

Thanks a lot for your reply Weedhound!

I had a wonder about the Slow Release Nitrogen as well, however, this problem was starting to occur well before I transplanted them. It started at 1 Plant when it they were in Peat Pots.
Then while still in peat pots, more and more plants began to show the same signs... I transplanted them to the larger pots and the new Non-Miracle Grow soil hoping it would help.

Im just hoping someone has seem these symptoms before and can give me a clue as to the problem before I loose a months worth of effort.

I feel for you.....if you have a chance read my thread about some of my wonderful soil experiences.

http://boards.cannabis.com/grow-loun...n-so-long.html

If this is happening in your peat pots what kind of water are you using? It sounds like a ph issue....do you calibrate your ph tester? What kind do you have?

I'm just guessing on all this stuff....i'll just babble and toss out ideas and hope one of them sticks unless you tell me to shut up or find out what the problem is.

Good luck

PS..If it starts at the beginning you need to break down what things DO NOT CHANGE from the time you start them until the time they kick off.

Also don't know if you've seen this link but it's great

International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

Thanks WH I have seen that link before...

Im starting to think that they are suffering from overwatering, heat stress, and a sever phospherus def, as well as lots of micrinutrient defs. I was using 1/4 strength All-Purpose Miracle gro...which I now know has no micros. I have a feeling it is a deficiency of some kind because the plant seems to be affected at the tips and leaves of new growth and not so much of the older leaves (except the ones that have been sick a long time)

Im just looking for some sort of confirmation... not even confirmation just someonewho has maybe seen something that looks like this before.

Im thinking of ordering Quarts of FloraGrow/Bloom/Micro from General Hydroponics, they seem to be a perfect balance of all the nutes and micros. Im wondering if anyone has used them before?

Im also thinking of flushing all of them, and repotting them into 50% Perlite/50% Peat Moss to make sure the only nutes they are getting are the ones I give them, not to mention ensure proper drainage.

Does anyone have any other advice? I appreciate it in advance

I do know peat moss is known for it's poor ph....i wouldn't use it. Get a good all around potting soil and use that or ask what some others use....I'm not a soil grower. You certainly can use the flora series, the botanicare serious, the gh series, AN series....(on and on :D) They are all good products.

Well in line with what WH was saying, has anyone had problems with Pro-Mix?

I have heard great things but it is a mainly peatmoss soil. Anyone have experience with it?
Should I expect to use lots of PH UP if I use it as my medium? Am I better off with a standard potting soil with no added nutrients?

Well Stinky Attic told me peat moss has a ph somewhere in the fours or something......perhaps they adjust ph in the pro-mix?