Low humidity

That’s a common one, especially in smaller tents 👍 A few things that usually help more than just blasting a humidifier: • Move the humidifier intake closer to fresh air, not right under the exhaust. If it’s fighting your fan, RH won’t rise. • Lower the exhaust fan speed as much as you safely can. Even a small reduction can raise RH a lot. • Put a tray or bucket of water in the tent (or a damp towel hanging). Sounds simple, but it works. • Aim the humidifier at the tent wall, not directly at the plants. • With seedlings, you can also use humidity domes (cut bottles or cups) — very effective. At 78°F and 45% RH they’ll survive, but seedlings prefer 60–70%. Once they get a bit bigger, 45–50% is totally fine. You’re close — a couple small tweaks should get you there 🌱

Hi Buddy 45% isn’t ideal for seedlings, but it’s also not a disaster, so don’t panic or chase numbers too hard, watch the plants first. A few easy things that actually help raise RH in a small tent: • Wet towels / cloths hung inside the tent or over a bucket of water → instant passive humidity boost • Open trays or bowls of water (even better near airflow or under light warmth) • Raise the humidifier off the floor so the mist isn’t just settling immediately • Make sure exhaust isn’t too aggressive — high extraction will fight your humidifier nonstop • If the humidifier is small, it may simply be undersized for a 2×3×72 tent → very common issue • As a short-term fix for seedlings: clear humidity domes or cut bottles work perfectly Also worth saying: Seedlings can survive just fine at 45% if temps are stable and watering is correct. Curling, wilting, or stalled growth matters more than the RH number on the screen. Growers Love my friend and happy growing 👊🙌💪

Bro… just think about the seedlings growing in the Moroccan desert… do you really think they have 60% RH for the perfect VPD ? Don’t catch OCD … Optimal Crop Disease… Seedlings have a roots , they don’t really need to be in the 60% RH range , not like clones with no roots. You can hang wet towels in the tent if you think they absolutely need to be at 60% RH…

bigger or more humidifiers. you can reduce the rate of gas exchange... the tent will be at a higher offset.

Far more problems arise indoors from maintaining a constantly high RH% compared to running at 45-50%. Potatoe, potatoe, OH but you won't optimize vpd!!!!! Rh needs to be 60+%. Vpd is for transpirational pull, there is very little if any transpiration at night. True enough. But who cares how much carbon you capture during photosynthesis if your plant only converts a fraction of that carbon into usable energy for growth. Incorporating a proper wet dry cycle in your indoor tent is far more important if you want to make it past flower. More moisture there's in the air, the more resistance the plant encounters when oxidative phosphorylation occurs. Oxidative phosphorylation is the final stage of cellular respiration, although its a 24/7 operation its is masked by photosynthesis and is largely performed at night when the plant sleeps. This is where 90% of a plants energetic capacity comes from. Add humidifier days only, pumping more moisture into tent at night is detrimental. Just make sure medium doesn't run out of water. Water by morning, perfect soil composition for respiration at night. To maximize plant health and prevent disease, it is generally recommended to keep the nighttime VPD relatively close to the daytime VPD (roughly 0.8–1.2 kPa, depending on the stage of growth). This means that as temperatures drop at night, the relative humidity should also be allowed to drop to maintain a consistent VPD. RH% of 45-55% daytime will jump to 55-65% with the 10F degree drop from lights off, not to mention the plants will be spitting moisture out all night (that doesn't come from the pot). If you are getting anywhere close to 65% at night then cellular respiration practically grinds to a halt and/or is greatly diminished. Keep her watered, add a few degrees to ambient. Add a little humidity daytime if needed. Don't fuss so much over precise vpd. Over-rated.