The 6.2 to 6.6, does that include a reading of what is actually going on in the root zone or just what you feed them? Do you know the nutrient concentration in the root zone? I have some thoughts about the “best one” going limp, maybe it had the best conditions and grew the fastest, maybe? Now maybe the nutes and or pH at the root zone is way off, either because they were depleted and thrown off by such a vigorous growing plant or the nutes built up too high and is now causing a problem, and in this case the pH at the root zone could also have still strayed far from ideal.
Also something a lot of new growers run into is not understanding the difference in the droopy appearance of a under watered plant compared to an over watered plant, they assume always under watered and end up giving the over watered plant even more water and end up killing it with kindness. Cannabis roots drown easily, not that different from cactus roots.
We could use more info.
What are the other parameters in your grow?
Let’s get you started with a support ticket, answer all the relevant questions the best you can and we might be able to get an idea of what is going on.
If you do not know, or do not use something, just say so or put ‘NA’.
ILGM Support Ticket:
What is the strain (strain name, unknown bag seed, etc)?
Indoor or Outdoor? If outdoor, planted in ground or in a container?
Size of space (max height and area, length/width)?
Soil or Hydro? Type of Medium used? System type?
pH? Of the soil or medium (root zone/reservoir/runoff) and of the water and/or nutrient mix that is fed to the plant? – water and nutes 6.2 - 6.6
Type and strength of nutrients used? NPK? EC/TDS/PPM levels?
Temperature? Day vs. night temp or highest and lowest temps? Root zone temps?
Ventilation system? Size? CFM? CO2? AC, Humidifier, De-humidifier?
Number “weeks/days” from into Season, Vegetative Growth or Bloom/flowering? – 24 days above ground from seed/veg(?)
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but try to be brief and to the point. Short and to the point questions and facts will help us help you