Autoflower Flowering stage humidity

Grow Support Autoflowers
1

Hi!

I have 4 White Widow Autoflowers solidly into flowering. A couple of them are about 3 weeks away from harvest. I finally got a dehumidifier and I am wondering what the optimal humidity to keep them at to avoid bud rot? But not too dry that the plants suffer.

I have 2 small fans going along with a 6" inline that runs several hours a day. Using it when temps are over 75 degrees in the tent. So now it is running most of the day but not much at night when the lights are off for 6 hours. The tent is 4’x4’x8’.

What humidity should I set the tent at?

2

Google a VPD chart for cannabis. It tells you what your rh should be at, for your temp and in what stage of flower. Or better yet.

Screenshot_20200430-232838
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There are some that show as a fancy curve but I don’t have time for that. Lol. This one is pretty easy to read

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3

humidity_vpd_144dpi_USE
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VPD isn’t critical at this stage, but basically - at 3 weeks away from harvest I would try to keep it around 35-40% humidity.

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4

@trog,

ope this hepls…

Schedule and levels
Follow this schedule to ensure you give your plants the right amount of humidity for optimum growth. Notice there is a difference in clones and seedlings.

Clones humidity level
Growth Week 1: 70%
Growth Week 2: 70%
Flowering Week 1: 65%
Flowering Week 2: 60%
Flowering Week 3: 55%
Flowering Week 4: 50%
Flowering Week 5: 50%
Flowering Week 6: 45%
Flowering Week 7: 45%
Flowering Week 8: 40%
Flowering Week 9: 40%

Check this complete Marijuana Grow Schedule with temperatures, humidity, watering and nutrients tips

Seedlings humidity level
Growth Week 1: 60%
Growth Week 2: 60%
Flowering Week 1: 55%
Flowering Week 2: 50%
Flowering Week 3: 50%
Flowering Week 4: 50%
Flowering Week 5: 50%
Flowering Week 6: 45%
Flowering Week 7: 45%
Flowering Week 8: 40%
Flowering Week 9: 40%

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