6 week in veg and plants are not growing

[BillyBanchan]

And no, they aren't suffering from lack of "rezzy bubbles." It's rockwool... Roots are breathing fine. It's the air in the room that's the issue.

The discoloration on top of some of the rockwool cubes is suspect. The high humidity is prime for mold, mildew, fungus...

 

[cannafarmer420]

This lemon cherry gelato strain grows tall which is strange cause mine is coming out short and at what height should I put it to flower?

Could be phenos, I would think genetics or lights intensity but dro is very touchy I don't mess with it

 

[Bdubs]

Don’t touch anything else, just crank up the dehumidifier to hold 60 RH and you’ll god bless this post. VPD is important, but it is not going to matter as much if humidity is stifling. Just don’t venture into .6 or 2.0 zone. CO2 is going to counter any high temp problems, don’t even worry about temps as you can run 88 temps just fine without any adverse issues. But humidity comes with high temps for VPD, VPD can trick you into making your environment not ideal. So focus conditions of the room before VPD and if you can hammer VPD while maintaining that environment, it is ideal.

 

[Bdubs]

Once you drop humidity, that 1250ppm is going to start showing it’s stress on them though. Don’t ignore the PPM. That does need to be dropped to 650-800 if you are still begging for a while and planning a hot nute cycle.

 

[TinFoilHat]

I run 1.6-1.7 seed to finish with Maxigrow. Anything higher is asking for trouble, IMO.