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VPD flower
HighAltitudeOrganicsanswered grow question 4 years ago
What is the VPD and LVPD right now? What do you see that indicates they aren’t liking things? Generally in late flower you want to be below 50% and 40% is a good spot. I live by VPD and dial in around 35% humidity late flower myself. Are you able to drop your daytime air temps?
Stonerdanswered grow question 4 years ago
VPD (Vapor pressure deficit) usually depends on the climate (temperature, humidity, moisture).
There are plenty of VPD charts for cannabis online but ideally I'd recommend 26-28 degrees Celsius with 50-70% humidity for optimal climate and VPD ratio!
*Don't forget to make sure there's enough air circulation when opting for those high humidity levels to prevent mold and mildews.
As for your plant it seems like you have a slight Nitrogen (N) toxicity - Deep dark foliage with slight tip chlorosis (burn) from bottom to the top.
Try lowering your "bloom" fertilizer to about 2-2.5ml/l since it has high Nitrogen content.
Hope this helps! Good luck and happy growing
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