Oh no! Why are my cannabis plants drooping this morning? And I see some brown spots on leaves out of no where. They looked wonderful last night. And brrrr it’s so cold in here. I remember the first time my grow room got cold I didn’t realize at first what was going on with my plants.

Cannabis plants don’t like the cold

Are my Cannabis Plants Too Cold?

Cold plants grow much slower than warm plants, and buds don’t fatten as much

Not only do cold cannabis plants grow slower in general because their metabolism is slower, but cool temperatures also cause the plant leaves to turn purple early in the flowering stage. This prevents some photosynthesizing, reducing yields and growth rates even further.

General droopiness and slow growth are the most common symptoms of plants getting too cold

Brown spots on leaves and brown curling leaf tips are common.

Cannabis plants often start getting brown spots on leaves in the cold. This is because water isn’t moving properly through the plant as opposed to a nutrient deficiency

Cold temperatures can cause plants to get odd brown spots because water isn’t moving properly through the plant

Other common symptoms include yellow or droopy leaves and ends that get brown and curl up, almost like nutrient burn only it happens even if you didn’t go overboard with nutrients.

Bleaching and plant death can happen. If there is a major cold snap where temperatures fall close to or below freezing, it can bleach plants or even kill them.

Freezing temperatures can cause leaves to get bleached or even kill the plant

It’s common for leaves and buds to turn purple in response to cold. This is fine at the end of the flowering stage, but if it happens too early it can interfere with photosynthesis and reduce your yields a little.

Cold plants tend to produce small buds with a lot of stem between buds.

Too Cold? Here’s What Cannabis Growers Can Do

Controlling cold is important because cold temperatures too often while growing greatly reduces plant growth speed, make them more likely to suffer from wilting, and greatly reduces the final yields.

1.) General principles for temperature control

• Set grow up properly to manage cold (more info below)
• Adjust time of day/night periods – Set your grow lights to turn on at night.
• Use auto-flowering plants so lights can be on 18+ hours/day in the flowering stage to help keep plants warm
• Cold-resistant strains – Some strains can handle the cold better than others. Try to pick a strain that is hardy to your personal challenges

2.) Use Light Schedules to Your Advantage

• Change your grow light schedule
  • Make sure grow lights are on at night when it’s the coldest in the grow space.
  • Make sure your “night” period happens during the warmest part of the day (at least above 70°F if possible)
• Keep your grow light at full power. If you need to reduce the light levels, move the whole lamp up instead of dimming it. This produces more heat overall.

Change your grow light schedule so lights are on the coldest parts of the day (use a timer)

3.) Which Grow Light for a Cold Grow Room?

Some cannabis grow lights are better than others if you’re struggling with cold. The #1 thing you can do is use “Big Bulb” grow lights like MH/HPS or LEC (aka CMH) grow lights.

• Avoid LED grow lights. LEDs are typically a great choice for cannabis growers, but aren’t ideal for a cold grow room. Not only do they put out less heat per watt than other lights, plants tend to be sensitive to cold. LEDs use tiny diodes to produce light, which is then concentrated by lenses and reflectors to put light down directly at the leaves. The temperature inside the leaf is barely affected by the light, and therefore if you use a thermometer gun on the leaves of a plant under LEDs, you’ll see the leaves are typically about the same temperature of the air. Plants like temperatures about the same as humans, and the temperature inside the leaf matters much more than the temperature of the air.
• Use HIDs (big bulb lights) like MH/HPS combo or LEC/CMH. Big bulbs tend to raise the inner temperature of the plant leaves compared to the air (think of the hot sun on your skin, or how your skin gets warm if you hold it next to a bulb for 10-20 seconds). Plants grow best in warm temperature, and this extra heat inside the leaves allows plants to do more photosynthesis and therefore grow faster than they would if they were the same temperature as the air.
• Keep grow light as close as possible to plants without seeing signs of light stress on the leaves closest to the light. Giving proper nutrients and water will allow you to keep the grow light closer without stress.

Cannabis plants tend to be much more cold-resistant overall if you use “bulb” grow lights like HPS or LEC, as opposed to LEDs.

4.) Other Equipment Tips

• Use a grow tent to help contain heat vs growing plants in an open room.
• Insulate grow tent or grow space to help prevent heat from escaping out the sides
• Get a fan that controls fan power based on temperature, such as an AC Infinity fan. They’re a little pricey but can reduce or turn off the fan if the temperature starts dropping. That way if it gets really cold one night it will turn off the fan and help contain heat. (Note: Turning off the fan reduces the amount of oxygen available to the plants and makes the carbon filter ineffective since no air is flowing through it and stinking up your grow room.

An AC Infinity fan has the ability to turn off the fan if the temperature drops too low, to help keep warm air in the grow tent until the room warms up. As a bonus, they’re super quiet.

5.) Are there supplements to help cannabis plants deal with cold?

Unfortunately, not really. Though there are some things to remember with cold and nutrients/supplements for cannabis plants.

• Silica supplement helps plants have a more sturdy structure. This helps them resist temperature changes in general.
• Giving the right amount of water and nutrients makes plants more resistant to cold (and any other stress)
• Maintaining proper pH also makes plants more resistant in general)

This cannabis is stressed because of the cold night temperatures. A silicon supplement and good nutrient care can help it still produce well.

6.) Keep roots warm

Plants are much more resistant to cold when their roots are warm. So be careful not to put your plant pots directly on a cold cellar floor. If plants are sitting directly on a cold surface (like a basement or cellar floor), put a piece of plywood between the plants and the floor to help keep their roots from getting cold. It can also help to put your plant pot inside a bigger pot. This helps add an extra layer of insulation around the roots.

Protect plant roots from a cold floor. This grower put the plant pot inside another plant pot, and sit both on a saucer that raises the plant off the ground so roots never sit directly on the cold floor.

7.) No overwatering! Cold cannabis plants drink less water

Cold cannabis plants drink less water and are more prone to drooping and overwatering. Cold cannabis plants still tend to droop or wilt when they’re getting the right amount of water, so drooping may not be a sign of a watering problem.

Cannabis plants are simply more prone to drooping and overwatering. Cold cannabis plants still tend to droop or wilt even when they’re getting the right amount of water, so drooping may not be a sign of a watering problem.

Be extra careful not to overwater your plants in a cold growing environment. For small plants give just a little water in a circle around the plant.

This plant was overwatering and then got cold, giving it curling leaves.

8.) Strain Choice

Mainly you want to grow auto-flowering strains because they allow you to leave the grow lights on 18-24 hours a day, which reduces the time the lights are off (when plants tend to get cold). The other thing is to opt for a cold-resistant strain.

• Autoflowering strains – Allow you to keep your grow lights on for 24 hours/day, which can help prevent cold times when lights go off.
• Cold-resistant strains – Even if it does get cold, these plants can handle it better than some other strains.
• Indica strains – Indica-leaning strains tend to be more cold-resistant than Sativa or Haze, but not always

LSD-25 Auto is an example of a cold-resistant autoflowering strain that makes great bud quality. Check out this gorgeous LSD plant by StickyFingers.

9.) Get a heater

Get a heater if your grow space is just struggling to stay warm enough to keep plants happy and healthy. If you are struggling with high humidity, get a big dehumidifier which will not just lower the humidity but also greatly warms a room. If you’re struggling with low humidity (more common in a cold climate) consider getting a heater that also has a humidifier.

If your cannabis plants keep struggling with the cold and none of the other options work, you may need to get a heater in the grow space.

10.) Power Outage Prep

Cold climates often also struggle with problems like blackouts or power outages, especially during winter storms.

• Check this article for tips on preparing and dealing with power outages.

Cold Grow Rooms Do Have One Cool Advantage

Lets end on a positive note. Having a cold grow space sucks but you do have one big advantage. When buds are air-drying, they do best around 60°F. Most growers have to use an AC to achieve that temperature but for a grower dealing with cold, usually that’s not a problem.

For most growers, dealing with cold is usually easier than dealing with heat!

Hey, the one good thing is bud quality tends to be better when it’s cool!

The post 10 Ways to Deal with a Cold Grow Room appeared first on Grow Weed Easy.

Brrrr it’s getting cold in the cannabis grow room. When temperatures drop, cannabis plants can start growing slowly and sometimes even stop growing altogether. You can heat the grow room (and here are some cold climate tips) but it can also help to make sure you choose the right genetics because some cannabis strains handle the cold much better than others. It’s always a smart choice to pick a cold-resistant marijuana strain if you know that your grow area will experience chilly temperatures on a regular basis. Learn where you can get seeds.

7 recommended cold-resistant photoperiod strains (6 auto strains below!)

• Amnesia Blue Head Band
• Frisian Dew
• Hindu Kush
• Matanuska Tundra
• Midnight Mass
• Orange Candy (aka Naranchup)
• Tangie x Chocolope

Frisian Dew is an excellent strain for outdoor growing

6 recommended auto-flowering strains for the cold

• Blueberry x Mazar Auto
• Blue Cheese Auto
• Dutch Blue Auto
• Lemon Haze Auto
• LSD-25 Auto
• White Widow x California Snow Auto

One advantage of cold temperatures is it tends to bring out colors like purple and pink

The post 13 Cold-Resistant Cannabis Strains appeared first on Grow Weed Easy.

GrowWeedEasy.com teaches you how easy it is to grow weed. Growing weed can be easy when you know what to do, but most “how to grow marijuana” tutorials make it seem like you need a degree in horticulture.

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Even first-time growers produce great harvests when they follow our tutorials.

Who Made GrowWeedEasy.com?

Grow Weed Easy.com was started in 2010 by home growers Nebula Haze and Sirius Fourside. Together, they built a free online “encyclopedia of cannabis home grow” with 650+ expert home cannabis cultivation tutorials about every aspect of growing weed.

GrowWeedEasy.com is now the biggest and most comprehensive source of free home grow information in the world.  We show you how easy it is to grow your own marijuana at home.

The GrowWeedEasy.com Ethos

Our Goal: You grow as much top-shelf weed as possible, with as little time and effort needed to grow your desired yields and cannabis bud quality.

Whether you’re a total beginner who wants to start growing cannabis indoors for the first time, or an experienced grower who wants to upgrade your skills to Pro level, this website was built for you.

Looking for a complete harvest system?

If you want dense, beautiful, great-smelling weed, our new digital book gives you our complete harvest system. Follow the straightforward instructions and massively upgrade your results every harvest. A few small changes can make all the difference.

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If you’re reading this right now, you want to grow great cannabis at home.

Cannabis plants isn’t a regular house plant, but learning how to grow isn’t as complicated growers make it seem. We’ve spent the last 16 years breaking down the home grow process so anyone can learn it.

The key to consistent harvest results is simple: follow a proven system developed for home growers.

You could waste an entire grow learning through trial and error…

Or take the shortcut and harvest a sea of fat, dense, beautiful buds that smell great. At home!

Follow our 5-week course and get walked through each part step-by-step. Build by experienced home growers and honed with hundreds of students since 2019, we ensure you achieve great results on your very next harvest.

Learn How To Grow Top-Shelf Weed at Home!

Start Your First Class TODAY!

You may be asking yourself these common growing questions:

“How do I grow marijuana indoors?”

Read this guide on how to grow marijuana indoors. Or check out this article to learn what materials you need to get started growing your own marijuana!

Luckily, it’s really easy to get a cannabis seed to sprout!

“How much money will it cost to get started?”

If you’re considering growing weed, it costs as little as $300 to get started growing or a bit more for a semi-automatic, high-yielding bubbleponics grow system. See examples of yields to expect, electricity use & startup costs for different setups. Read this article to see even more growing styles with different price ranges.

“Where can I get marijuana seeds?”

Check out our How to Buy Marijuana Seeds Online Guide (with delivery to every state of the USA) to safely get your hands on good genetics. Starting with good seeds lets you choose the looks, smell, and effects of your buds!

Learn where it’s safe to buy cannabis seeds online (2026 update).

What do good cannabis seeds look like?

Learn about the best marijuana beginner strains and how to research and find the right strain.

Cannabis buds are generally green, but can also be pink or purple with certain strains.

“How much will electricity cost each month?”

If you’re just growing a few marijuana plants for personal use, it will cost you $20-$100+/month for electricity, depending on what grow lights (electricity) and nutrients you use. On average, I’d say a hobby-size grower might pay about $50/month to grow, but it depends greatly on your setup and local electricity costs! How much will electricity cost each month?

“How can I increase my marijuana yields?”

We have quite a few techniques to choose from or combine! See some of our most popular pages:

• Super Cropping – A simple technique to bigger yields
• Simplest Guide to Growing Short & Bushy Marijuana Plants
• LST (Low Stress Training) – Training your plants can easily double your harvest!
• Or check out our page on the controversial defoliation technique

Even More Ways to Increase Cannabis Yields

1. Increase Light Intensity (plus choose right light for desired yields & possibly add CO2)
2. Manipulate How Plants Grow (a free way to yield more bud indoors)
3. Provide Right Nutrients (low Nitrogen in the flowering stage, and remember sometimes less is more!)
4. Control Growing Environment (let the growing environment work for you)
5. Harvest Plants Properly (most importantly, don’t harvest early!)
6. Lastly, it’s important to remember that the strain has a major effect on yields!

Two small cannabis plants can yield several ounces of premium weed!

“How can I grow weed privately?”

Read guide on growing weed indoors without anyone knowing. But remember the most important factors to stealth growing: “No tell, no smell, no sell.” Never tell anyone, not even your best friend, that you’re growing. Be on top of preventing smells, and never ever sell cannabis. Breaking one of those 3 principles is how 99% of growers get found out!

“What if my plants get sick?”

The most common issue a grower runs into is a pH imbalance. Barring that, your marijuana plants likely either have a nutrient deficiency, heat or light stress, or are being attacked by some sort of marijuana mold, pest or bug. Whether you call it weed, cannabis, sinsemilla, skunk, pot, marijuana, or something else, the plant known as Cannabis Sativa is a hardy weed in the wild and can actually be easy to grow indoors at home when you know what to do.

Growing Medical Marijuana

“Medical marijuana” has become a household name. The body of evidence for medical marijuana in the treatment of cancer and other illnesses is growing every day. And for those who need medical marijuana, growing weed indoors is the perfect way to ensure a safe, regular supply of buds, for cheap.

In fact, when you grow weed indoors for personal use, you often end up with way too much. If you catch the growing bug like I did, and if you start enjoying the process of tending your cannabis garden just for the sake of gardening, you’re going to have to find a way to press, cook, freeze, and concentrate all your extra buds. 🙂

As you probably know, both medical marijuana and recreational cannabis have been decriminalized or legalized in many places around the world and weed is becoming legal in more places every day! Yet there still aren’t many simple indoor “how to grow weed” guides for beginners (even for those who legally grow, such as medical marijuana users and those who live in places where marijuana is legalized for personal use).

If so, I know how you feel. It can be hard to weed out all the bad information on the internet and find well-researched, free tips or instructions on how to grow your own cannabis. That’s why Grow Weed Easy.com aims to be a simple online resource that explains from start to finish what you need to do when growing cannabis so you can learn how to grow cannabis with great yields and potent buds, even if you only have a small grow space like a closet or even a computer case.

We’ve grown cannabis out of closets and have gotten ounces of buds and you can too. Grow Weed Easy.com covers many popular cannabis cultivation topics, including:

• A comparison between different cannabis grow lights including experience-based information about LED grow lights
• A page that teaches you the basics of how to grow weed
• Detailed how-to weed growing tutorials
• How to start growing weed tomorrow  (simplest cannabis growing guide!)
• Grow 4 oz with a 100W LED <– An Easy Way to Start Growing!
• Our famous grow guide that teaches you how to grow weed using bubbleponics (hydro).

Start Growing Weed Today!

Grow Weed Easy is run by a panel of experienced cannabis growers, including the founders Nebula Haze and Sirius Fourside, who originally teamed together to bring you GrowWeedEasy.com. Due to the demand for more marijuana growing information, we’ve also started an inbox magazine all about how to grow weed, with additional tutorials, tips, and tactics sent to you each week. Simply sign up to start getting free expert growing articles delivered to you! All the information available at GrowWeedEasy.com is completely free and we regularly update the site and make new additions.

Looking for a growing book?

If you are interested in doing a bit of reading or would like to know more about the science behind marijuana hydroponics or horticulture, I strongly recommend viewing our page of Marijuana Grow Book Reviews. Read reviews of marijuana grow books. We would love to hear about your experiences with growing cannabis. Whether you are a pro grower already or are just starting your first plant, we have learned so much from our readers both beginners and masters! If you have any suggestions, comments, concerns, or just want to ask some questions about your marijuana grow, please contact us!

Happy Growing!
Nebula Haze & Sirius Fourside

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