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growing weed in cold temperatures

Growing weed in cold temperatures

The problem with HID lights, however, is that these light fixtures create a ton of heat. This means that indoor growers often require special cooling systems in their grow room to keep the plants at a comfortable level. Not so during the colder months of the year! The colder temperature outside and the hot HID lights can make it so your plants can grow in just the right temperatures. This means no extra heating or cooling required for your grow room, which can help save a lot of money. Some growers take the colder months of the year as an opportunity to add more HID lights to their grow room for higher yields.

Better safe than sorry! If you’re growing outdoors, you never know what might happen. Even with the best planning, something unforeseen such as frost, unexpected storms, or animals taking a liking to your plants can always occur. If you keep a mother plant or two indoors in veg, you can ride out bad weather and other unexpected things. Should something happen to your crop, not all is lost because you always have a backup!


Modern LEDs are now almost, if not equally as powerful as HID lamps, yet they use only a fraction of the power of HID lights. This can add up to significant savings on the grower’s energy bill over time.

Use Pots5. USE POTS

The colder weather in fall and winter isn’t just a concern if you grow cannabis outdoors. Low temperatures can also affect your grow indoors. Your plants may avoid the threat of frost if they are away from the elements inside your home, but the lower temperatures combined with high humidity can still cause problems. For example, this can greatly increase the risk for mould and bud rot. However, whether your plants can get over the colder months will depend on several key factors. One of them is what type of grow lights you use.

Growing weed in cold temperatures

Therefore, if some of the best seeds are provided from these countries to the current cannabis market, is because is really possible to grow cannabis during the cold season, taking into account that many of the genetics which can be found in the seed market, have been progressively adapted to European latitudes.

How cold affects marijuana

We at PEV Grow would like to encourage anyone who wishes, but does not dare, to try out winter crops, because it is possible, especially if we take certain aspects into account:

Tips to combat the cold weather

-Smaller plants: Considering the previous point, it is logical that the plant we grow in winter does not reach a large size. In fact, it is estimated that they do not usually exceed 100 centimetres in height, but they can give us between 20 and 60 grams per plant. Although it’s not a good idea to do this with autoflowering plants, as these genetics will not have the photoperiod or the proper light intensity to provide an acceptable amount of vegetal mass.

Growing weed in cold temperatures

Let me elaborate a little more on changing the light schedule. It’s common to grow in a garage or attic that is an okay temperature during the day but too cold at night when the grow lights go off. In this case, change your plant’s light schedule so the grow lights turn on at night (during the coldest hours) to help equalize day and night temperature.

Temperatures are dropping in many parts of the world and unfortunately, cannabis plants don’t like the cold. In fact, most cannabis strains grow significantly slower once the temperature gets under 60°F (15°C), and freezing temperatures can cause major injury or even plant death.

Switch timer’s on/off cycle so grow light is running at night

Keep roots warm and up off the cold floor

But did you know there’s a type of cannabis that will make buds even if you leave your grow lights on for 24 hours a day?

Avoid LED Grow Lights (Use HPS if Possible)

However, if you deal with cold temperatures, LEDs are a poor choice. Not only do they produce little heat, but they also make plants less resistant to cold in general. On the flip side, HID grow lights like CMH/LECs and HPS produce a lot of heat to help keep plants warm. HPS in particular also produces a lot of infrared light, which helps raise the internal temperature of leaves to help keep plants warm from the inside out.