Tips for Growing Cannabis Indoors During Winter

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Tips for Growing Cannabis Indoors During Winter

If the seasons have changed and the colder weather has set in, you’re likely seeing slower growth from your cannabis plants, especially if you’ve decided to begin growing indoors. However, at Neptune Seed Bank we’ve helped provide many with some great strains to grow during winter and we have a few tips for you.

Here are some ways to ensure a healthy harvest when growing indoors this winter!

Paying Close Attention to Temperature is Essential

When growing cannabis out of season (during winter) it is the opposite time when these plants are used to growing, meaning you’ll need to provide them the perfect temperature and nutrients to thrive. Growing during winter requires much more upkeep than simply keeping the lights on. A drop in temperature during the flowering cycle will lead to a smaller yield. However, it’s important not to overheat your plants, which will damage the soil and roots, so adding a ventilator or cool tube to your indoor setup is essential.

How to Accurately Monitor Temperature

The best way to monitor the temperature in your grow area is by investing in smart thermometers that notify you via a wireless device when there’s been a change in temperature. Keeping as steady a temperature as possible is key because when plants lose heat, it takes longer for them to warm up when the lights come back on, costing you valuable grow time.

Remedying Temperature Fluctuations

If you’re struggling to keep the temperatures in your indoor from fluctuating, adding a heater might be necessary. You can program to turn it on and off to ensure it’s operating when the temperature drops, for example, when you turn the lights off at night. Remember, the lesser the temperature, the less yield you’ll have when harvest time comes around.

What Type of Heater is Best for My Setup?

We understand that every indoor grow operation is different; some might simply be using a small tent while others, an entire greenhouse. That’s why selecting the best heater for your needs is extremely important. For smaller spaces, a 450-watt oil radiator can provide the perfect amount of warmth. However, if your temperature drops rapidly at night, you’ll probably want something around 750 watts or more.

Fan heaters are also beneficial for quickly warming up larger spaces and spreading heat more evenly throughout areas. They also don’t need to be running nonstop. Of course, you’ll need to perform a bit of trial and error to get it right, but heaters can be easily programmed to turn on and off every hour or two to maintain a steady temperature.

Other Heating Options: In addition to the heating methods mentioned above, there are also other heating options that are more advanced, such as:

  • Bar or Tube Heaters: Much in the same way cool tubes act to keep your plants from overheating, bar and tube heaters keep them from becoming too cold. However, they’re usually best for smaller operations.


  • Electric Blankets: Cannabis plants depend upon their roots to distribute water evenly throughout the plant and ensure that the plant has enough nutrients to grow big, healthy buds. That’s why many also invest in electric blankets to regulate the root temperatures of their plants when growing indoors in winter.

Things to Keep in Mind When Adding Heat

When adding heat to your indoor grow room, it will affect some things that you need to be aware of, such as the humidity in the area. More heat can mean much more humidity, causing root rot and other issues if you’re not careful. For this reason, it’s a good idea to invest in a humidity monitor, in addition to regularly testing the EC and pH levels of your plants.

This should be practiced at every stage of the plant’s growth, not just when they’re flowering.

A Few More Things Before We Go…

Before we go, we wanted to let you know about some of the best strains to grow during winter. These are hardier strains designed to be durable, handle fluctuations and still offer a great yield, meaning if you follow the tips above, you’ll have no problems.

Some of the best cannabis strains to grow during winter include:

  • Bubba Kush: One of today’s most popular strains, Bubba Kush is a dominant Indica that has large leaves and thickly packed buds, exhibiting a beautiful rainbow color.


  • Northern Lights Auto: Anyone who’s a fan of cannabis has likely heard of the strain Northern Lights. This auto-flowering strain is robust and produces high levels of THC. It also grows well in all environments.


  • White Widow Auto: The auto-flowering White Widow strain offers a pleasing and relaxing effect and produces flowers without the need to stimulate the onset of the flowering cycle by reducing light exposure. This makes it an easy strain to maintain that produces great results.

We currently have a number of strains with the above lineage. Simply use the Search box above Product Categories to find strains that contain a particular lineage.

Contact us today for more cannabis growing tips, accessories, & hybrid strains!

If you want to begin setting up your very own indoor grow operation to grow during the winter, the team from Neptune Seed Bank can help. We have all the growing accessories you’ll need, like farmer packs of seeds, clone shippers, sex testing kits, and more.

Contact us today online or email [email protected]

DISCLAIMER: This website does not provide medical advice.

The information contained on this website is for information purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or another qualified healthcare provider with any questions you may have.

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