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A little more information? Lighting, strain, days in cycle, nutrients, growing medium etc? Sent from my SAMSUNG-SGH-I337 using Grasscity Forum mobile app

 

     I would guess root rot with the info provided which is only that picture. Do you use soil if so make sure it has GREAT drainage..    Good luck

 

Water pH and run off pH? That's the best way to diagnose possible nutrient problems as you can't always distinguish between deficiencies. What soil are you using?Sent from my SAMSUNG-SGH-I337 using Grasscity Forum mobile app

 

Looks and sounds like the plant isn't happy with the medium you're providing for it. It is sort of like going on a diet of just Red Bull and Mountain Dew, with a few spoons of sugar added.

Flush it well, let it recover from that, then start feeding it with something the plant actually needs, i.e. plant nutrients that have balanced ingredients (most if not all bloom products are simply not suitable, and cause an imbalance between elements, Google 'nutrient antagonism'.) and ingredients the plant can actually take up.

 

It's certainly possible, especially if you grow from seed, that one is much weaker than the rest. I usually got 1 of those myself.

The problem with supplements and additives is that they can quickly skew the balance, regardless of the brand. I don't have any recommendations for specific nutrients. Not suggesting to throw what you got away entirely either, but what you are experiencing looks like a typical/classic result of switching to bloom products, especially if you do it early in the cycle, or even use two bloom products ( and boosters and stimulators etc). Cannabis plants need less N during flowering than they do during veg, but bloom products often contain such high P and K ratios that there's little to no N left while it is an essential element of any plant nutrient. Not just because the plant needs it, but because it is essential for the uptake of other elements and maintaining a stable pH level. Which is even more important if you don't adjust and measure it (which isn't really needed on soil IF it contains a balanced mix of ingredients).

While there are growers who claim to notice benefits from using molasses, it remains a fact plants don't need it. If you really want to use it, I suggest to at least stop using it on that plant until a week or two before harvest.

If you got a pH meter, try the pour-through method (google for instructions ) and compare it to the plants that are doing fine and you'll probably notice a good difference. Which doesn't mean you need to start adjusting the ph, the plant can regulate it but only in a healthy medium.