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Strain: ??? Light: Mars Hydro FC 4000-EVO (320w) Veg Cycle: 24/0 Container: 3 Gallon Fabric Pots Growing Medium: 2/3 Canna Coco, 1/3 Perlite Veg & Early Flower Lights ON TEMP/RH: 80-85F, 50-60% Lights OFF Temp: 75F Late Flower Lights ON TEMP/RH: 75-80F, 45-55% Lights OFF Temp: 60-65F...

I'm keeping all variables identical to my previous grow where I was locked on to 1.0 during veg. My EC/nutrients are the exact same down to the ml. I kept paper notes so I'd be able to do a 1:1 comparison. The only thing that changed is the RH, which in turn results in the higher 1.4 VPD value...

The chart compensates for that. That's what the "Leaf Temperature Adjustment: -2F" in the top right of the chart is referring to. When I checked leaf temperature with my infrared thermometer, it was exactly -2F below the room temp, so that should mean everything corresponds correctly with the...

Yep. I went down the YouTube rabbit hole of people boasting VPD as this holy grail of environmental parameters. Sounds good on paper, but it seems like a lot of people get hung up on it instead of sticking to what has worked for decades, before VPD became the big industry buzzword.

I understand VPD and the correlation with the plant stomata, and that following the chart should provide optimal growth. However, last grow I had my veg VPD matching the attached chart and encountered slower growth compared to this round. Same genetics and root development of the cuttings prior...

I second this, except the 50% part. I'm an old school grower, but I think designated flower times and VPD schedules are convoluted and most growers are better off learning to "read" the plant and trust your plant knowledge eyes over recommendations.

I'm back into growing after a 10 year hiatus and have been researching new industry techniques and all anybody talks about now is VPD, but I'm not sold on it. Anybody else having better results by ignoring VPD altogether and going with temps and humidity levels that are off the recommended "VPD...

It looks premature. I'm not sure 8 weeks is the schedule to stick to with that one.

Me too. 10 years ago LEDs were trash, but I'm happy with the performance of modern diodes.

Not crazy bad. Dial back your PK by 25% and see if the yellowing simmers.

Thanks. I'm just getting back into growing after a 10 year hiatus.

I wouldn't worry about it. This closeup photo is the same plants from my previous post, when they first started turning purple. The side by side is what they looked like a few weeks into flower compared to near end of harvest. Some strains do it no matter what temps, and some are more prone to...

Mix Azamax in a cup that's as tall as your tallest cutting and submerge them to where the stem meets your rooting medium. Leave them submerged for a few seconds and pull them out and put them in quarantine. Azamax is OMRI listed. Inspect them for mites a week later, and even if you don't see any...