# When to start a fan on new grow?

**URL:** <https://ilgmforum.com/t/when-to-start-a-fan-on-new-grow/62549>\
**Category:** Grow Cycle\
**Tags:** ventilation\
**Created:** [February 9, 2021, 9:09pm UTC](https://ilgmforum.com/t/when-to-start-a-fan-on-new-grow/62549 "2021-02-09T21:09:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Abarnett88](https://avatars.discourse-cdn.com/v4/letter/a/5e9695/32.png) [@Abarnett88](https://ilgmforum.com/u/Abarnett88)\
**Post date:** [February 9, 2021, 9:09pm UTC](https://ilgmforum.com/t/when-to-start-a-fan-on-new-grow/62549/1 "2021-02-09T21:09:01Z")

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I have a seedling that is 12 days old. Grow tent temp is around 80 degrees and 45 humidity, and this is with a small humidifier in the grow tent. I already have an intake and exhaust fan. When does the seedling need to have a fan blowing on it to give it that light breeze? I am finding that if I turn on the fan, my humidity drops down below 40% My question, do seedlings need the fan or does that start at veg stage?

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**Author:** ![MidwestGuy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/midwestguy/32/914277_2.png) [@MidwestGuy](https://ilgmforum.com/u/MidwestGuy)\
**Post date:** [February 9, 2021, 9:21pm UTC](https://ilgmforum.com/t/when-to-start-a-fan-on-new-grow/62549/2 "2021-02-09T21:21:02Z")

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A steady breeze on any aged cannabis plant will drive a stronger structure. At 80F I would want a higher humidity and would take the trade-off in favor of humidity. There are other things that you can do for structural strength like a silica product or seed sprout tea.

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**Author:** ![Jake3](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/jake3/32/425022_2.png) [@Jake3](https://ilgmforum.com/u/Jake3)\
**Post date:** [February 9, 2021, 9:51pm UTC](https://ilgmforum.com/t/when-to-start-a-fan-on-new-grow/62549/3 "2021-02-09T21:51:51Z")

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I absolutely agree with @MidwestGuy. Do you want us to see if a mod can move this into your other thread? They may be able to get it all into one journal so it keeps the server a little more clear. And no worries, you’re doing great!

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**Author:** ![MidwestGuy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/midwestguy/32/914277_2.png) [@MidwestGuy](https://ilgmforum.com/u/MidwestGuy)\
**Post date:** [February 9, 2021, 9:57pm UTC](https://ilgmforum.com/t/when-to-start-a-fan-on-new-grow/62549/4 "2021-02-09T21:57:21Z")

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Be careful using a silica product. It’s easy to overdo it and a little bit goes a long way.

Too much silica can create a rigid structure that is very hard to train since the rigidity can lead to broken stems where you only intended to bend them, and so on. I’ve personally split a lot of nodes trying to train plants that had been given too much silica.

A couple of ml over 1 or 2 waterings does wonders.