OK.....Plant issues after turning to flower

Base Information:

I put 5 plants into 12/12 flower on 10/1/2012. All 5 plants were healthy when putting them in. Now, this is the growing conditions/equipment during this time frame:

Container: Plastic pots, 4 Gallon I think.
Soil: Sunshine Mix #4 Aggregate Plus
Nutes: Technaflora applied exactly as directed
Veg time of the 5 plants: Between 6-8 weeks (got clones at different times)
Temp ranges: 65-75 degrees
Humidity ranges from 40-52%
Lighting: 600w HPS sitting about 1.5/2 feet above canopy as heights of the plants differ.
Fans: (2) one at canopy level and the other one is under canopy level.

Thats about all I can think of right now. Now for the issue at hand. A few of the plants have started developing yellowing edges on some of the leaves. Some of which are curling up and are crispy to the touch. I have adjusted the light several times already and cannot think of anything else it can be. The pH of the soil is good, I don't have bugs, and the light isn't too close to the canopy as I first thought this might be heat damage. The problem seems to be getting a little worse every few days to a week. I need to find out how to fix this because I cannot afford to lose these plants.

The pics I have upoaded aren't the best but its the best i can do atm. You can see the curling and the discoloration even though the color is hidden some by the use of the light. They should give you a good idea though.



Any help would be greatly appreciated.

what kinda water?

Oh yeah. I have been using distilled water mostly as my tap water is VERY hard.

Cal Mag with that correct?

Basically the Nutes I am using suck then?

I also forgot to mention. I am feeding my vegging plants the same brand of nutes (a vegging mix anyways) with the same water and they are all very healthy.

mg def. from distilled water. correct with cal/mag

Any nute can get locked out given the right conditions. Although, you may just have a build up overdosing your feeding schedule. If you are seeing it in just one strain now it may just be a sensitivity characteristic to high nute (PPM) levels. Like a canary in a coal mine

scroglodyte said:

mg def. from distilled water. correct with cal/mag

Click to expand...

Do my nutes not have Mg and Calcium in them?

Not enough when using RO or distilled water.

read..........................if on label, then yes, but many do not.

All that PPM out of your tap is Cal Mag. RO and distilled water have a starting PPM of zero.

I read the labels and yes, they do have Mg and Ca in them. Should I still get the Cal Mg to add?

Will do.....