[Bilboscrogins]

45% is pretty good at the age they are mate. Personally dont mind humidity a little on the low side keeps em drinking and feeding.

[zeke99]

45% in veg will slow the rate of growth. Honestly this is fine if you're not growing for income. Think about it that way.

We had a stretch during this past January, when it was unusually cold and dry. The RH% in my apartment was 10% Yes, 10%. Meanwhile I had just transplanted clones and you're damn right that growth was slowed as compared with previous rounds (same equipment, same clones, same location, only difference was a much lower RH). But, I'm lazy and I had time for an extra long veg, so I didn't build or buy a humidifier.

In an ideal world, using VPD principles straight up would be great for overall growth throughout the life of the plant, but pandora opened that nasty little box (PM) and we have to live with the results. So I think that 55% + or - 5% is a great compromise when factoring in PM and bud rot against yield in late flower. Higher in that range with lights on and lower with lights off. Maybe a little below 50% depending on where you live because of spore count. The idea though is to keep the air moving. I think we can all agree that stagnant air, in an indoor grow is no good.

[bsgospel]

45% - great
55% - great
70% - great

The key is to keep it stable- whatever you end up with. Mildew doesn't arise from humidity being too high or too low- it's fluctuation constantly. Find your highs and lows with lights on and off and then keep it in that window.

[AgentPothead]

Originally Posted by bsgospel

Mildew doesn't arise from humidity being too high or too low- it's fluctuation constantly.

Yeah my understanding is high night humidity increases the production of spores and then low day humidity increases the distribution of spores, so the worst cases show up with wide humidity swings. I'm pretty sure GreenCure works as not just a curative, but also a preventive, so you might want to look into that too Chrono.

[bsgospel]

Bingo

[jidoka]

Give me 75% in veg and I will get you 2 ft plants in 1 month. Drop that to 65 for 3 wks flower. Then lower if you want. But I want to see every single plant dancing with air movement

[Chrono2]

thanks for all the replies everyone! right now my day and night humidity is about the same maybe 10% swing, sitting at 51% right now and it is "night" for them right now, and id say 45% is about average during the "day"

i do have enough fans and circulation to make the plants dance for sure, i think i am going to get a humidity controller and set it on my exhaust and see how that works
and i wouldnt say that i am growing "for income" but i am a legal grower for multiple legal marijuana patients, so yield and quality matters, im hoping to be growing medical quality by next year and im still in the lerning phase so willing to try anything that makes sense, and vpd makes sense to me, cheers everyone <3

[stoned40yrs]

Plants will grow faster and better with high humidity in veg and first 3 weeks of bloom. After that then take it down to 45-50% for the rest of bloom to prevent the buds from melting.

[Chrono2]

these are some pics of the tents, 2 are platinum LED one is a old regular mh / hps (got another 4x4 tent in the works)
this is about day 27-30 from seed (about 10 are 1 day behind)

feminized non autos (in the small tent) are - sour diesel, white widow, blueberry, northern lights skunk, jack herer, kushy, og kush, canuk cookies. (each tray of 3 has a different start date about a week apart)

auto flowers (big tents) are - lemon drop, uk cheese, dwarf low rider, amnesia, super lemon haze, grape fruit, great white shark, quarter pounder, hindu kush

for 17 total strains

auto flowers

[noyd666]

Originally Posted by jidoka

Give me 75% in veg and I will get you 2 ft plants in 1 month. Drop that to 65 for 3 wks flower. Then lower if you want. But I want to see every single plant dancing with air movement

same here, 75% veg
70% to 50% flower ,
plenty of air movement. dehumidifier.