Can Autoflowers Grow In Winter?
- 1. What is cannabis ruderalis?
- 2. Can autoflowers grow in winter?
- 3. Can autoflowers withstand different climatic conditions?
- 4. Factors to consider when considering growing autoflowering strains in colder climates
Cannabis was one of the first crops cultivated by man. It grows well in any climate, but it does struggle in extreme temperatures. If you want to grow cannabis that can handle varying temperatures, your first choice must be autoflowers. In 2026, there are many people who want to know if autoflowers can grow in winter. If you’re one of them, this article is just for you.
Many people know cannabis as a somewhat exotic plant that requires plenty of care and attention as well as a warm climate. While some strains fit this description, it isn’t always the case. Some varieties of cannabis are extremely hardy and more equipped for harsher environments. Although they all belong to the same species, several subtypes of cannabis have much different characteristics.
Generally, autos grow in a range from 15 to 25°C and may be able to grow in colder climates depending on the overall conditions, so it's possible to grow autoflowers in winter. But how can they be more resilient? Why are autoflowers special? Well, to understand that, you need to know that cannabis plants can be divided into Indica, Sativa, and Ruderalis varieties. The autoflowers we see today were created by crossing the Ruderalis species with Indica and Sativa plants.
1. What is Cannabis Ruderalis?
Ruderalis comes from the word “Ruderal”. Ruderal simply refers to a species that grows in different conditions despite several obstacles.
Many people say that Ruderalis was nothing but an Indica plant that evolved to grow in harsh conditions. It also learned to withstand harsh conditions in such a way that the cold northern regions didn’t seem to deter it. It wouldn’t be wrong to say that Ruderalis actually grew in an environment that would have been tough for most other cannabis plants.
Originating in the northern regions, Ruderalis is native to locations such as Eastern and Central Europe. Specifically, it thrived in Russia, where chilly temperatures made it almost impossible for other plants to survive. Whether the area was inhabited or simply ignored, Ruderalis kept spreading everywhere. It’s also easy to discern why cannabis is sometimes referred to as “weed”. In other words, it spreads without any inhibitions, and Ruderalis did just that. Although Ruderalis had captured the imagination of breeders and researchers, it was a scrawny plant. It adjusted to harsh conditions, yes, but it didn’t grow as big as its counterparts. It also produced very little yield. One also couldn’t ignore the fact that it wasn’t as good as other photoperiod plants.
Among the few advantages it had, the best part of Ruderalis was that it didn’t grow according to seasons. Simply put, it wasn’t dependent on the photoperiod like other cannabis plants.
Cannabis plants go through the vegetative cycle first, and, as soon as the seasons change and the darkness period increases, the plants start flowering. This stage is known as the reproductive or flowering period. This is true for photoperiod cannabis plants. However, Ruderalis is different. It flowers based on age, regardless of the light and environmental conditions.
Breeders recognized that it was a wonderful species. Imagine how amazing it would be to combine the best traits of Ruderalis and other photoperiod plants? Thus, Ruderalis was crossed with other species, and the result is the autoflowers right in front of us today. Considered a wild species, Ruderalis didn’t have a lot of things going for it at the beginning. Not only was it short and tiny, but the buds also weren’t great either. And, since cannabis growers love plants that produce dank buds, Ruderalis wasn’t considered something you could grow. Nobody was going to go through all the trouble of growing plants producing low yields, especially when they spent a lot of money on lights and other equipment indoors.
However, after several decades of crossing and pollinating Ruderalis with other species, it was evident that Autoflowers could actually beat photoperiod plants.
2. Can autoflowers grow in winter?
Generally, summers have longer days while winters have shorter days. In the wild, cannabis plants grow a lot more in the summer compared to winter. Even if you’re in the city and you grow plants outside, you’ll have more success in summers compared to winters. Cannabis plants planted in winter will not fare well because the daylight hours don’t provide enough light for the plants to grow a lot during their vegetative cycle. And this is speaking about photoperiod plants.
However, as mentioned earlier, autoflowers are different. While photoperiod plants need a minimum of about 16-18 hours of light to grow in the vegetative stage, autoflowers will grow well even if they receive only 12 hours or even less. Literally, under any light cycle.
Despite being able to withstand colder climates, It’s better to provide the best conditions possible to achieve the best plant growth, so if you want to know, the best conditions for autoflowers are:
- Seedling Stage: 23-26°C and 75-85% Humidity;
- Vegetative Stage: 21-26°C and 70-80% Humidity;
- Flowering Stage: 15-24°C and 40-50% Humidity.
Obviously, you won’t be able to maintain these exact conditions outdoors, so this is just a guideline to give you an idea of what you should try to achieve if possible.
Unfortunately, if you time your cultivation schedule wrong, the first hard frost will damage and potentially kill your plant. Why? It all has to do with vacuoles. These are the compartments of plant cells that store water. Under normal conditions, and when filled, these organelles make cells expand and give plants the turgidity that they need to stay upright. During a heavy frost, the water in the vacuoles freezes, causing the cell to expand to the point that the cell walls break. While some cannabis varieties can handle a light frost, most will die quickly after experiencing a heavy one.
3. Can autoflowers withstand different climatic conditions?
As you know, Ruderalis had and has the capacity to adjust and grow in many different climatic conditions. After it was crossed with Sativa and Indica species, it showed tremendous promise. There was a lot of buzz in the cannabis world when the first Autoflower “Low Ryder” was introduced. However, it fell short of expectations.
Low Ryder didn’t produce great yields and wasn’t as big as its counterparts. But now, the situation is different. Along with the advantage of growing without relying on the seasons, autoflowers also produce great yields. And yes, they can get as big as photoperiod plants.
Due to its genetics, Ruderalis plants are very resistant to harsh temperatures. Since its growing cycle is short (8-10 weeks), you will be able to grow a few plants even in the winter. Of course, the yields will not be as good as the amount of buds you get during summer when light is abundant, but don’t you think it’s amazing to harvest even 100 grams of bud per plant during winter?
Ruderalis plants are also very resistant to mold and wet weather. The new generation of autoflowers also carry the same traits, and you’ll see that they do well even if the climate doesn’t support healthy growth. Since the cycle is shorter compared to other cannabis species, you’ll not have to worry too much about pests and diseases.
4. Factors to Consider When Considering Growing Autoflowering Strains in Colder Climates
Growing any plants during the winter months is no easy task, and that is as true with autoflowering cannabis as with anything else. The one thing that is going in its favor is the fact that the genetic heritage of autos (Ruderalis) comes from the cold, harsh climates of northern Europe. But, even with this genetic predisposition to grow in colder climates, some thought and planning should be implemented before you consider starting a winter autoflowering cannabis garden.
Indoor or Outdoor
It goes without saying that it is much easier to control the environment indoors than it is outdoors. Even in the coldest places, it is possible to heat and control the humidity in a grow room to the point that the plants will have no idea of the harsh conditions outdoors. But this is not what we are really discussing here today. If you want to give your outdoor garden the best chance to survive and flourish during the winter months, we recommend starting the crop indoors under lights. This gives the roots their best chance at laying down a great base for the rest of the lifecycle.
Keep a close eye on the environmental factors
If you see the temperature regularly dipping below about 12℃ (55℉) then it may be time to start thinking about other lodgings. A greenhouse can be super useful for outdoor gardens in the winter months and can help you control the temperature ranges at least to some extent.
Choose suitable genetics
To give yourself the very best chance of a healthy and fruitful winter harvest, grab the best genetics for the conditions.
In general, Indica-dominant strains will fare better than Sativa-dominant strains in colder weather, as they have the genetic lineage that can grow healthy in colder conditions.
Choose the right location
You can help a winter crop along immensely by simply choosing the right location. You want a spot with as much sunlight as possible that is well protected from strong wind (although some air movement is advised) and from heavy rain. Of course, water is required for the crop, but heavy rain can cause a whole range of issues.
FAQ
Autoflowers generally perform best in temperatures ranging from 15–25°C (59–77°F) during active growth. Temperatures significantly below this range can slow biological processes, while freezing conditions can cause serious damage.
Autoflowers may grow outdoors during winter in regions with mild climates and sufficient sunlight. However, areas experiencing frost, snow, and extended freezing temperatures are generally unsuitable for healthy outdoor growth.
Yes, winter can affect autoflower growth through reduced daylight, lower temperatures, and changing humidity levels. These environmental factors can influence photosynthesis, nutrient uptake, plant metabolism, and overall development.
Autoflowers are not frost-resistant plants. Frost can damage leaves, stems, and other tissues by causing ice formation and cellular injury. Severe or repeated frost exposure may kill the plant.
Autoflowers have an advantage in that they do not rely on seasonal daylight changes to initiate flowering. However, this does not necessarily make them more cold-resistant than photoperiod plants. Winter performance depends mainly on genetics and environmental conditions.
Yes, autoflowers may grow in a greenhouse during winter, particularly in mild climates. Greenhouses provide some protection from wind, precipitation, and temperature fluctuations, although an unheated greenhouse may still experience freezing temperatures.
Autoflowers are not adapted to growing in snow or frozen soil. Snow-covered environments typically expose plants to low temperatures and limited light, making healthy growth difficult or impossible.
Yes, cooler temperatures can influence pigmentation in some cannabis varieties, particularly those genetically capable of producing purple or reddish hues.
When autoflowers experience excessive cold, their growth may slow, leaves may become discolored, and nutrient absorption can be affected. Severe cold exposure can damage plant cells, interrupt normal development, and potentially cause plant death.
The biggest challenges include low temperatures, shorter daylight hours, frost exposure, excess moisture, and limited sunlight. These conditions can increase plant stress and make consistent growth more difficult, particularly outdoors.
Comments