Stunted plants

[Mat1979]

Can anyone give advice please, I have 2 plants that have just stopped growing. One is about 2" tall and the other about 4". I think I watered too early. How can I get them kick-started again please?

 

[AutoWonders]

Can anyone give advice please, I have 2 plants that have just stopped growing. One is about 2" tall and the other about 4". I think I watered too early. How can I get them kick-started again please?

Post a photo. That would be very helpful. Also list the light and medium you are using and how you watered (include any nutes) up to this point.

 

[Mat1979]

Hi thanks, sorry for the late reply. I'm growing in Coco perlite 70/30 mix. Under bigsm0 cob lights and a t5 fluorescent when very young. I use the canna range and always have and had no issues. Temp and humidity are fine. I use 1/4 strength of what the canna guide recommends, I haven't (don't think) ive changed anything for over a year. But now every one I bring on just stops drinking and growing.
I'm growing mephisto.
I calibrated my ph meter too.
I'm so confused right now.

 

[Archaic]

What is your pH? How often do you change out your coco and what brand of coco is it? If they are separate containers and they both stunted you have a systematic problem. I lost a bunch of plants this fall to a pH issue from cheap bagged compost. If you've ever let your pH meter completely dry out, it may be reading incorrectly even if it says it's calibration is correct.

 

[Mat1979]

Because of the way I grow, I have 8 in at once spaced approx a 3/4 weeks apart, so the nutrients and pH is so routine that I know by the amount of drops of if something isn't right.
This is what I don't get, I haven't changed anything.
Sorry here are the pics

 

[Mat1979]

Even same coco and perlite, water source, light source. Doing my head in lol

 

[Mat1979]

Any ideas please?

 

[Waira]

I think part of the problem is you're treating the coco like true soil, and that will always come back to bite your ass,... coco is a very specialized medium, far different from soil, with a lot of do's and don't's, much of it related to it's odd CEC properties (cation exchange capacity).... have you done your homework on coco? It's closer to hydro in many ways,... Are you reusing the coco? Do you monitor your EC/TDS (ppm's) going in and coming out? Are you ever just adding water alone (a no-no)? Are you running at least 15% run-off each time you feed, and testing both pH and ppm's of that run-off? Again, what brand of coco? ...problem is what you describe as the issue could be caused by several things,....