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URGENT - Very slow growth and dying leaves - Please help me save my grow

Latinogrower

New member
First I'd like to thanks everyone who took the time to read this thread.

So, here is my problem:

I'm growing a Somango and a Super Silver Haze since mid-April, but the growth has been remarkably slow since the beginning. Initially, the Somango was really stuck, then, when it was showing some signs of recovery, the SSH started showing some very abnormal growth, and when it became vigorous, the Somango displayed problems again, this time with leaves slowly necrosing and dying. The plants were alternating problems like that until recently, when they finnaly started to show some strenght and consistency.

All of a sudden, about one week ago, the situation turned: the growth of both plants virtually stopped and their lower leaves began necrosing and dying (the Somango never got rid of the problem, but it was improving a lot), only that this time the necrosis seems to be moving a lot faster - every time I open my grow the situation is worse and I see new affected leaves. If it continues like that I think both plants will die soon.

I'm growing in a wardrobe (about 1.7x0.8x0.5 meters HxLxW) with CFL lamps (160W), and using soil (50% perlite and 50% peat), in 7 liter fabric pots. The plants are receiving a weekly dose of Bio-Grow and Bio-Heaven, about 2.5 ml of each (initially it was 1.5 ml, though last week I lowered the dose again). They also received some Magnesium Sulphate, but I cease the application about two weeks ago. I wonder if the decrease of the ferts dose (and the cessation of the Magnesium Sulphate) is somewhat responsible for the plants getting worse, but I did that because the growth was already stopping and I thought that maybe the problem was overfertilization...

After the initial difficulties, I came to the conclusion that the PH of the water I was using with the plants may be causing the problem, so I bought a PH pen and, when I finally managed to use it (like 20 days ago - it took a long time to arrive), it was indicating 7.5! After correcting the PH of the water to 6.2 and flushing the plants, the initial response was satisfactory, but soon things became very ugly, and here I am. My last attempt of solving the problem was flushing the plants again 3 days ago, but it only seemed to accelerate the deterioration.

Some people will tell me to throw the plants away and startover because they're weak and will not develop in a satisfactory manner. Unfortunately, thats not an option now since those were my last two seeds and I will not be able to obtain more for some long time. Well, I think thats all. Thanks again and I will appreciate a lot any comments and suggestions!

Peace
 

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I mainly grow in soil. So here's my .02$...

If you have the ph stabilized, then I say give them a moderate dose of nutrients. That looks lke some deficiencies to me.

Good luck my friend
 
how often do you water your plants? can you tell us about that ventilation and temperature.

Furley, thanks for your help. The plants receive water twice a week (here where I live is a little bit dry). I have a clip ventilator that blows air on the plants and the extraction is made through an e-11 (around 2800 RPM). Temperature is between 20-25ºC.
 
The reason I think so...
If the ph was 7.5 then the plants were unable to get any nutrients due to lockout. Now flushed, the ph is good, they can get what they need. But don't over do it.
 
Copy and paste.

Peat moss is a valuable addition to potting soil because it can absorb and hold as much as 20 times its weight in water. Although it contains few nutrients, it absorbs and holds the nutrients that are dissolved in the water. Both the moisture and the nutrients in the peat moss are readily available to the plants' roots. The down side of this is that peat moss drains very poorly, and unless it is mixed with sand, vermiculite or another ingredient to promote drainage it can become a soggy mess. Once peat moss dries out it is difficult to get it wet again. When you water a dried-out pot, the water runs down the sides of the root mass and out of the drainage holes without being absorbed. When this happens, try soaking the pot in a container of lukewarm water for about 30 minutes.

[h=2][/h]
 
I had a good look at the pics that we're posted one plant looked like it had a mild case of nute burn ....on the tips ..plus peat is acidic I think between 4 and 5.not sure but read that some where.
 
So in your post you said you had 7 liter pots or did you mean 7 gal?. because that would be a big difference .just trying to understand.
It is a 7 liter pot. I didn't knew about this problem with the peat moss, thanks for the info. Anyway, the soil is half peat moss and half perlite, which is awesome to promote drainage, so I don't think thats the problem..
 
I had a good look at the pics that we're posted one plant looked like it had a mild case of nute burn ....on the tips ..plus peat is acidic I think between 4 and 5.not sure but read that some where.

That is what I'm afraid of - giving more nutes and worsening the situation. But, on the other hand, I just flush both of them 3 days ago and it didn't help, actually, they seem to be deteriorating rapidly ever since.
 
PH being all wacky will definitely cause you problems with nutes so a good stable PH is key as the others have mentioned.
I would like to add under watering ( plants look dry and crispy) I don't use peat but a general rule is 20 to 25% of your pots size is the pots minimum capacity to be completely water. 7 liters pot = 1.4 to 1.7 liters water you are close but You may want enough to saturate the whole pot without a whole lot of runoff. But like I said never use peat for pot so it could be different.
How old are your plants?
 
Did you check the pH going in and pH coming out I know you said you flushed but its always good to be definit (lock out) and how much runoff do have when you water ?..7liter pot you give 1 liter of water every? You have a 2 gallon pot..could be root bound?.or rootrot.
 
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