How to Control Temperature and Humidity for White Widow?

White Widow's a moody plant. Not diva-level, but close. You mess with her environment—too hot, too damp—and she’ll sulk. Or worse, mold. So yeah, temperature and humidity? Not optional. They're the whole damn game.

First off, temp. Keep it around 70-80°F (21-27°C) during the day. Nighttime? Drop it a bit—65°F-ish is chill. Literally. But don’t go freezing her out. She’s not a pine tree. If your grow room swings too much between day and night, she’ll stress. And stressed plants? They herm. Nobody wants seeds in their stash.

Now humidity—this one’s trickier. Veg stage? She likes it moist. 60-70% RH is her sweet spot. But once she starts flowering, drop that fast. Like, 40-50%. Maybe even 35% if your buds are fat and dense (they will be). High humidity during flower is a mold party waiting to happen. Bud rot is a silent killer. You won’t even know it’s there until you crack open a cola and—bam—gray death inside. Gross.

Dehumidifier? Yes. Get one. Or two. Don’t cheap out. And if your grow tent’s in a basement, double up on airflow. Stagnant air is the enemy. Fans everywhere. Oscillating, wall-mounted, under-canopy—make those leaves dance. Not thrash. Just a gentle shimmy.

AC helps too, especially if your lights run hot. LEDs are cooler, but HPS? They’ll cook your plants if you’re not careful. I’ve seen tents hit 90°F easy. That’s not growing—that’s slow-roasting. Keep an eye on your thermometer. And don’t trust the cheap ones. Get a digital hygrometer with a memory function. Know your highs and lows. Guesswork is for gamblers.

Also—pro tip—lights off is when humidity spikes. It creeps up while you sleep. So run your dehumidifier at night. Or set it on a timer. Or just don’t sleep. Whatever works.

CO₂? Sure, if you’re fancy. But don’t even think about that until you’ve nailed the basics. Temp. Humidity. Airflow. That’s your holy trinity. Everything else is just noise.

And don’t listen to every stoner on Reddit. Half of them are growing in closets with zero ventilation and still bragging about their "fire" harvest. White Widow deserves better. She’s a classic. Treat her like one.

Anyway. That’s the gist. Keep it cool, keep it dry (when it counts), and don’t overthink it. She’ll tell you what she needs. You just gotta pay attention.