[GWE] Humidity In the Grow Room

Published: Sun, 11/17/13

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Issue #83 - Sunday, November 17, 2013

Dear Fellow Grower,

In today's issue...

  • Learn how to control the humidity in your grow room for faster growth & bigger yields!
  • Discover how to monitor your humidity and temperature remotely, even when you can't get to your grow room!
  • Check out how one grower from Denver was able to control the temperature and humidity of his grow room.

Happy Growing!
Nebula Haze & Sirius Fourside (founders of GrowWeedEasy.com)

"It looks as though yields of over 10 times what we can currently grow per acre are feasible if you control the CO2 concentration, the humidity, the temperature, all the various factors that plants depend on to grow rapidly."

~Ralph Merkle

by Nebula Haze & Sirius Fourside
Introduction

To grow the stickiest, most potent buds, your cannabis will demand attention to its many needs.

One of these needs of the growing cannabis plant that is commonly overlooked is humidity.

Believe it or not, humidity is actually very important to your plant, and it will help determine its resilience against mold/mildew in addition to how much your plants need to drink.

Luckily, there isn't much to learn, so you can be the master of humidity in your grow with very little effort!

Today, we will give you the information to master humidity and thus, give your plants a boost in production!

Why Humidity Matters to YOU
In all stages of cannabis growth your plants will have a constant need to intake water, and the amount of water they need fluctuates with the humidity in your grow room. When the humidity is high, cannabis plants use their leaves to absorb moisture from the air which causes them to  drink less water from their roots. Conversely, when the humidity is low, they will pull more water in through their roots since less is available in the air.

Since humidity changes how much water your plants drink, being in control of humidity gives you increased control over nutrient intake.

But controlling humidity isn't just about prevention...having the right humidity encourages strong, healthy, leafy plants with vigorous growth. In fact, growing with DWC (Deep Water Culture) / Bubbleponics during vegetation with the correct humidity can actually turn into a struggle to tame out-of-control plant growth!

Additionally, after your plants start making buds in the flowering stage, you can manipulate the humidity to get your plants to produce more resin (trichomes/glitter which contain THC and other cannabinoids) while preventing plants from being attacked by mold. High humidity can sometimes cause mold - a grower's worst nightmare for those fat, dense main colas.

Effects of Poor Humidity Management
  • White Powdery Mildew
  • Bud Rot or Mold
  • Nutrient Problems
  • Slowed Growth

Learn more and see pictures of what to look out for:
http://www.growweedeasy.com/humidity-growing-cannabis#effects-of-poor-humidity-management

Humidity Basics

Okay, you know why you need to manage humidity when growing cannabis, but you may not know what humidity you are aiming for.

Humidity is actually a measure of how much water vapor is being "held" in the air. There are different ways to measure humidity, including absolute, specific, or relative humidity.

Most growers are talking about Relative Humidity or RH when they talk about humidity in the grow room.

Relative humidity measures how much water is in their air compared to the maximum amount of water that can be held in the air at that temperature.

Here's a quick reference for the major stages of the cannabis life cycle in regards to the relative humidity you are aiming for:

Check it Out!
Monitor temperature & humidity in your grow room!
I like the Ambient Weather WS-07 Wireless Thermo-Hygrometer because it lets you remotely check the temperature and humidity from another room (don't forget to get 6 AAA batteries).

Monitor temperature & humidity even while you're away!

Here's a really simple solution that lets you check your temperature and humidity of your grow room in real-time, even if you're not at home!

  1. Buy an indoor/outdoor temperature+humidity sensor and display, such as the model  listed above

  2. Put the "outdoor" module in your grow tent or box.

  3. Put the "indoor" display in front of a webcam (you may have one built into your laptop, or buy a cheap and easy-to-use one like the Logitech HD Webcam C310)

  4. Install LogMeIn (it's free)

  5. You can now log into your computer from any other computer, open the program for the webcam, and see what your grow room stats are in real-time.

Thanks to Tokiehardo for this awesome tip!

Who Runs This Newsletter?
Nebula Haze:

Marijuana has literally saved my life, and I'm dedicated to showing you how easy it can be to grow.

I have made it my mission to build growing resources to help both new and advanced growers get bigger, better yields with less time and money.
Nebula was published in Skunk Magazine!
Sirius Fourside:

Sirius Fourside is a hobbyist grower who has gained the bulk of his experience growing in water as a medium(deep water culture, bubbleponics).

"Growing cannabis is a relaxing hobby in and of itself, but it also saves you money and keeps you from having to deal with shady characters. Cannabis is much easier to grow than people give it credit for, and growing in water doesn't increase the difficulty much, if any. But whether you want to grow in water, perlite, or a different medium, we'll show you how easy it can be!"
Trophy Pic of the Week!
Marijuana plant trophy pics by thatsnotmybike

Too Hot, Too Dry - Humidity Story from a Grower in Denver

by thatsnotmybike

I'm preparing things for my first grow and trying to make sure that I plan everything 'right' and I'm not surprised by too many things, and hopefully none too late to fix.

Humidity has me confused. I've seen sources saying the greater the humidity the better, some that say humidity makes no difference as long as the plant is hydrated, and some claiming nothing will grow if you're not nailed at 45%.

The ambient humidity near Denver is pretty low - the room I plan to grow in sits at 20% on average. Is this too low for my plants to be happy?

Answer:

This humidity is too low for healthy growth of cannabis plants. This grower decied to build something known as a swamp cooler: http://burningman.rengeekcentral.com/swampcooler.html

It moistens the air while keeping the temperature down, which can also be a problem in Denver.

Update from the grower: For anyone stumbling onto this in the future, the swamp cooler in the link above is friggin awesome. I have it connected to my intake ducting and it's keeping the cabinet at 73F with 80F outside temps! I cannot downplay how great it works, but I recommend creating a way bigger reservoir, so you don't have to refill it every 6-8 hours.

View current grow by thatsnotmybike here: http://www.reddit.com/r/thatsnotmygrow/

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