[GWE] Grow Room Temperature Tutorial

Published: Sun, 02/16/14

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Issue #96 - Sunday, February 16, 2014

Dear Fellow Grower,

In today's issue...

  • Learn how to control the temperature in your grow room so your plants grow their best!

  • Learn about a comprehensive Growing Resource that will show you the science behind growing your own professional-quality buds...

  • This week's Trophy Pic features...

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

"Truth often suffers more by the heat of its defenders than the arguments of its opposers."

~William Penn

Introduction

Cannabis likes a comfortable room temperature when growing indoors, or a little warmer - not too dry, not too humid.

For a lot of indoor growers, that is all you need to worry about. If it feels too hot or too cold for you in your grow area, it's probably too hot or too cold for your cannabis plants as well.

Cannabis plants like about the same temperature as humans do!

If your grow room feels warm or cold, humid or dry, that is a sign that you may want to look into changing the temperature and/or humidity of your grow area.

Generally, cannabis plants prefer temperatures in the 70-85 °F (20-30 °C) range during the day when lights are on. When lights are off (or at night), cannabis plants are happy with slightly cooler temps.

Optimal Temps For Growing Cannabis

Vegetative Stage: Young growing cannabis plants in the vegetative stage prefer temps a bit warmer than in the flowering stage, in the 70-85°F (20-30°C) range. More about temps in the vegetative stage.

Flowering Stage: In the flowering stage (when cannabis plants start making buds), it's best to keep temps slightly cooler, around 65-80°F (18-26°C) to produce the best color, trichome production and smell. There should be a 10 degree difference between night and day temps for the best results (this is especially important in the flowering stage for highest quality bud development). More about temps in the flowering stage.

Why Temperature Matters to YOU As a Grower

Why Is Temperature Important When Growing Cannabis?

Can cannabis stand freezing temps? What happens if your grow room gets too hot?

Different afflictions can happen from high or low temps, so let me break that down for you.

Too Low (Cold) Temps

Colder temps will tend to slow down growth. Temps lower than 60°F (15°C) tend to upset plant growth and freezing temperatures will shock or even kill a cannabis plant.

Plants are more susceptible to certain types of mold when it's cool, especially if it's also damp. Colder temps and big temperature fluctuations contribute to over-purpling of leaves and can also reduce photosynthesis.

A plant that is grown in relatively cold temps can survive, but it will never grow as fast or as well as a plant that is given proper temps. Indoor plants tend to be much more susceptible to cold than outdoor grown plants.

Too High (Hot) Temps

While cannabis plants don't usually die from the heat, too hot temps will cause plants to grow much more slowly. 

Please note temps above 80°F (26°C) in the flowering stage will not only slow down bud growth, but can reduce the potency and smell of your buds - keeping the grow room temperature under control is especially important in the flowering/budding stage!

In the heat, cannabis is also more susceptible to many problems, including spider miteswhite powdery mildew (especially if it gets humid, too), root rotnutrient burn (from increased water transpiration), increased stretching, wilting due to root oxygen deprivation, and reduced "smelliness" of buds (asterpenes can burn away at higher temps).

More About the Upper Limits of Temperature

  • With bright grow lights (such as 600W HPS and brighter), cannabis plants of all stages can thrive at slightly higher temps up to a max of about 85°F (30°C) even with no CO2 enrichment, as long as there is low relative humidity and plenty of air movement.

  • Cannabis plants can thrive at even higher temperatures, up to an ultimate max of about 95°F (35°C), in an environment with low humidity, extremely bright grow lights and enriched CO2 (above 1500 PPM) - this is not your average grow! Learn more about CO2 here: http://growweedeasy.com/co2-marijuana-yields

Did you know? CO2 Enrichment Changes Optimal Temps

Cannabis plants like higher temps when you supplement the grow room with CO2, but there are a few important things you must know about CO2.

For CO2 enrichment to be successful, you must... 

  • Seal the environment and maintain at least 1500 PPM of CO2 in the air
  • Provide a lot of light (more light than your plants would normally be able to use)​
  • Keep temperatures between 85°F (30°C) and 95°F (35°C).

Learn more about CO2 here: http://www.growweedeasy.com/co2-marijuana-yields

What else is affected by the temperature in the grow room?

  • The temperatures experienced by your plants while growing can have an effect on the color of buds and leaves, either suppressing or bringing out the blues, purples, and pinks if your strain has the genetics for it. But that's not all...

  • Temperature fluctuations can actually change how your plant grows! Cannabis generally prefers a cooler temperature at night, and slightly cooler temps during the dark period will encourage your plant to grow as fast as possible. Slightly warmer night temperatures will tend to slow down upward growth. 

  • Temperature has a big effect on the relative humidity of your grow area.

  • Temperature during the flowering/budding stage can change the taste & smell of your buds.

  • Drying & Curing - temperature is incredibly important to the drying & curing process, and a professional dry/cure is one of the biggest factors when it comes to producing top-shelf bud

Tip: Use Temperature to Help Control Growth!

Cannabis generally prefers slightly cooler temperature at night and warmer night temperatures will tend to slow down upward growth. But... you can occasionally use this knowledge to your advantage to help control plant growth!

By artificially raising temperatures during the dark period, it will slow stretching plants that are growing too tall too quickly. This can be a helpful way to reduce the "stretch" if you're growing in a situation where you don't have a lot of vertical room. And never forget about supercropping, the ultimate way to break down the height of your plant at any time.

By keeping temps a bit cooler during the dark period, you will actually encourage your plants to grow as fast as possible.

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.
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!"
Check It Out!

For Advanced Growers Only

You've told me you're looking for a complete guide to growing marijuana that covers everything, from beginner to ultra-advanced.

And the temperature of your grow room is just one part of the equation to getting seriously killer harvests. If you want to learn ALL the secrets... 

Learn from the best!

Invest in the most advanced Grow Bible Available: Growing Elite Marijuana

Total care explained step-by-step... indoors... outdoors...

Monster cropping... advanced growth control... bud production secrets... and much, much more...

Over 700 pages of pictures, tutorials and advanced insider tips!

Get Instant Access to It All Right Here: GrowWeedEasy.com/growing-elite-marijuana

"I thought I already knew it all, but after I went through this grow bible, I discovered that there were still lots of easy ways I could increase my yields and grow even more potent buds! I find myself going back to it again and again for new ideas." 

-Nebula

Trophy Pics of the Week!
Colorful cannabis buds by DanDaMann!

"An Afghan Kush I was told. Quite the colors."

~ DanDaMann

Remember, sharing is caring!

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