how cold can marijuana grow

As in everytime we grow cannabis, ” Every grower have their own way to crop marijuana”, but we want to give you some general tip with guaranteed results in order to be able to carry out your marijuana crop during the winter or in cold seasons of the year.

The most common period for growing marijuana is usually between the months of April-May (seeds germination), for the September-October harvest (this can vary depending on what planet hemisphere we live; the latitude and the season), since they are the months in which the weather is less hostile , and in the rest of the months, many are the self-growers who devote them, simply, to consume everything they harvested.

In addition, these seeds need less time to develop and, although they will not give large plants, the results will be good if we take into account the advice given in the previous section.

Tips to combat the cold weather.

For a long time and specifically in countries where it is not particularly cold all year round, as is the case in most European countries, a large number of marijuana growers devote to this task in the less hostile months of the year, i. e. those that range from April-May (germination and transplantation of seedlings and cuttings) to September-October (harvest), approximately, which is the time of outdoor harvest. The rest of the year, they devote to enjoying the production and prepare the next harvests.

-If we use indoor lighting : Continuing with the previous point, and if we want to enlarge the photoperiod of the plant with the purpose of promoting its growth, we will have to use indoor lighting, as for example, LEC . In PEV Grow you can find a wide range of lighting equipment to help you getting the best results.

Why? Because plants that are directly grown directly in the soil are more difficult to give them heat, if the soil is not hot. However, the pot will avoid this problem.

We also have the option of using a “blanket” for the floor , made of heat-absorbing materials such as a limestone blanket. It is a technique widely used in vineyards, to dampen the temperature differences between day and night . If there is frost, we will prevent the roots from freezing.

It is advisable to keep the seedlings indoor until the plant mass is adequate . In case they are cuttings, it is not necessary to take them out immediately, we can make them grow about 30 days . Watch out! As soon as we take our plants outdoor, the most normal thing for them is to start blooming, because they will notice a photoperiod shock.

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:

The Mediterranean is the most favourable climate for growing cannabis outdoor, especially in its flowering phase, although it carries an artificial irrigation calendar. But in cold climates it’s also possible to grow marijuana and, without going any further, here is the example of Dutch marijuana, where breeders have been grown during three decades the most powerful Indica marijuana genetics and hybrid phenotypes fundamentally.

How cold affects marijuana.

And when we speak of cold, we are not referring to temperatures below zero throughout the day and for long periods of time, since in those places it is difficult for this plant to grow; we are referring to climates where temperatures are maintained at an average of between 5 and 10 degrees, as is usually the case in the north of most countries in Europe or North America, as well as countries such as China, Pakistan or northern India, where the cold is present along the year in some of its most mountainous regions.

It’s true that the ideal season to crop the vast majority of cannabis seeds is when it is not particularly cold and the hours of sunshine are abundant (long photoperiod), helping its growth and proper development. However, cold temperatures should not prevent you from growing cannabis all year round. In this post we’ll give you some techniques to achieve it.

-The photoperiod is ideal for flowering : This means that our plant will start to bloom almost immediately. The best thing you can do is to grow the plants indoor until they reach a suitable vegetable mass, and then take them out to the garden (outdoor). The change to the natural photoperiod will do the rest. Do not forget to place the plants outdoors so that they have direct sunlight all day long.

-Be careful with the humidity! Although the truth is that during the winter, plagues are less common, humidity can always cause pest problems . We must bear that in mind. We must always use preventive fungicides, especially during the rainy season.

It is a great producer outdoors, due to its size, and a good choice for high altitude mountain areas, where cold nights give it attractive colours…

The best varieties for cold climates.

-Use pots : Especially if we grow outdoor and even though we are in a greenhouse in this case.

In PEV Grow you can find a wide selection of indica seeds , highlighting for example cultivars such as PEV Bank Seeds Critical Feminized, PEV Bank Seeds Mazar Feminized or PEV Bank Seeds Bruce Banner Feminized.

-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.

-Grow Indica or hybrid strains : They are the ones that, in general, best adapt to this type of climatology. Later on we’ll give you some tips about choosing the best seeds for this kind of weather, but you can take a look at a longer article already published in PEV Grow previously which is about this topic. Sativa strains are better adapted to tropical climates, and therefore need a lot of light intensity.

It is precisely from these places from where provide some of the most suitable seeds to grow in cold climates or in cold seasons , understanding the cold, as we have said, climate conditions with temperatures below 10 degrees, does not mean continuous frosts.

Other ancestral genetics of Indica phenotype , highly valued by our best breeders are cultivars such as Sensi Seeds Afghani 1, Dinafem Blue Hash, Dutch Passion Mazar and Sweet Seeds S. A. D .

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.

Air Conditioner – (some are portable, some ACs fit in your window) – in addition to cooling the air, an AC will also tend to lower the relative humidity of the air. To be effective, and AC must be able to exhaust hot air outside the house, just like hot grow lights. If the air outside the grow tent is already too warm, you will need to get an AC to pre-cool the air before it enters the grow tent. No matter how strong your exhaust system, it won’t be able to bring the temperature lower than your ambient room temperature. If you need to lower the ambient room temperature, you’re going to need a way to cool the air, and air conditioners are hands-down the most effective way to cool your air.

For example, a lot of people recommend that new growers get CFLs instead of HIDs so that there’s less heat in the grow room. Yet it’s essential to keep in mind that 250W of HPS light will produce about the same amount of heat as 250W of CFLs, except that you’ll get more light and better yields with HIDs. Another advantage of HIDs over smaller lights like CFLs is good models of HIDs come pre-built to accommodate cooling via an exhaust system.

7 Essential Concepts About Temperature Control.

For example, Warm air can “hold” more evaporated water than cool air.

Step 2: Refer to Temperature Chart.

But, if you do have the height to accommodate an MH/HPS light, I highly recommend going for that over CFL grow lights. In my opinion, CFL grow lights a best in very short/tight spaces where ultimate stealth is the biggest goal.

LEDs are known for needing just a little electricity and for producing less heat than HID grow lights like MH or HPS lights.

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

Too High (Hot) Temps.

Temperature & Humidity Adjustment Cheat Sheet.

For those interested in learning more about the science behind this, there is a term used by greenhouse growers known as VPD or “Vapour Pressure Deficit,” which roughly measures the temperature and relative humidity.

This thermometer ($25) seems more accurate than many others I’ve tried and is resistant to heat from grow lights.

It can be tough on the quest to find the perfect thermometer/humidity monitor, especially if you don’t want to spend a pretty penny. I like this one. It only costs $8, and it comes with a probe. I have the probe hanging in my grow tent near the plants, with the screen outside the tent. This setup makes it easy to see the temperature and humidity exactly where the plants are without having to open the tent.

HID Grow Lights – Metal Halide (MH), High Pressure Sodium (HPS) & LECs/CMH.

And while you’re here…

Change the Light Schedule: If you’re in a situation where the temperature is climbing too high at specific parts of the day, then you can change your light schedule so that your grow lights are off during the hottest part of the day. For example, in the vegetative stage, your plants need 18+ hours of light each day. If it gets too hot in the middle of the day, you could set your timer to turn your lights off for 6 hours during that part of the day. This strategy will not fix a major heat problem but can help alleviate symptoms of heat stress during a short hot spell or heatwave.

If you’re growing in a basement or garage, it’s common for the floor to be cold. If growing plants in containers, it can help to put them on a piece or some other barrier to prevent them from sitting directly on the floor.

What that means is if your buds stay too hot during the flowering stage, the higher temperature may accidentally be burning away some of your terpenes and cannabinoids (reducing the final taste/smell/potency of your buds after harvest).

It is especially important to make sure buds are not exposed to too-hot temps after week 6 or 7 of flowering, as this is when the terpene content in the buds starts to ramp up.

You can buy all the parts necessary for a drip system individually and assemble them yourself, but drip irrigation kits offer an easier and more economical option. They give you everything you need and can be assembled in as little as a few hours. By adding an automatic timer, you can even ensure your plants regular watering when you are away.

You will also want to be sure to provide your plants just the right amount of fertilizer. Many commercial fertilizers specifically formulated for cannabis are on the market. You can also mix your own with fertilizers high in nitrogen, phosphorus and potassium. If you do have a drip system set up, fertilizer injectors will help you as well.

In addition to high summer temps outside, grow lights themselves can cause excessive heat. If you are battling high heat, look for lights that emit less heat. In addition, you can use fans or portable air conditioners to cool your grow room to the proper temperature.

Watering Cannabis.

Just like people, plants do their best in a particular temperature range. Generally, pot plants in their vegetative stage prefer a temperature in a range from about 68 to about 77 degrees Fahrenheit. When they are flowering, cannabis plants like a range of about 65 to 85 degrees Fahrenheit. They can live in lower and higher temperature, but since you can control the heat simply indoors, why not give them what they want for maximum growth and potency?

Also consider humidity. Depending on the stage of growth, pot plants generally like relative humidity from 40% to 70%. Conditions that are too humid can lead to disease, molds and fungus. Extremely dry conditions can retard the growth of your pot plants.

Water is a crucial element of life, and pot plants are no exception. They need adequate amounts to thrive. Growing plants inside, you will need to provide a steady supply of just the right amount of H2O. You could hand-water with a hose or a bucket, but that is a time-consuming and inefficient process. A good drip irrigation system can deliver just the right amount of water to each of your plants efficiently and reliably.

If you need to increase the temperature, you can use a variety of traditional heating options, including electric, gas and other sorts of heaters typically used in homes or commercial buildings. Heat lamps and insulation are other possibilities, while heat mats underneath containers can warm the soil. In larger spaces, a fan can help circulate warm air so all plants can benefit from it equally.

Whether you want to raise cannabis commercially for profit or are looking to grow some bud for recreational fun or medical marijuana for good health, setting up and using a grow room offers lots of advantages. Unlike growing marijuana outdoors, raising it indoors in a grow room allows you to control all the crucial conditions that affect its growth, like temperature, light, nutrients and water. In addition, growing weed indoors will keep it away from destructive four-legged pests like rabbits and deer who may want your crop.

To help you get the most out of your pot-growing efforts, DripWorks has put together some basic tips to help you achieve the ideal grow room conditions for growing cannabis indoors. Whether you are growing one marijuana plant or a thousand, these ideas for perfect grow room conditions should help you get the most out of your efforts.

A grow room might be as small as a closet or as big as a barn. No matter the size of your grow room setup, you want to pamper your plants for maximum growth and strength.

How to Get Sunlight & Fertilizer for Indoor Cannabis Plants.

Pot plants need plenty of sun to grow too. But indoors they will be shielded from Old Sol. To substitute for the sun, a wide choice of grow lights is available on the market, making it easy to meet your growing needs and your budget.

Use a hygrometer to determine the humidity in your grow room. Humidifiers, dehumidifiers and watering systems can help you achieve just the right level of humidity. Depending on the conditions outside, opening or closing the entrance to your grow room can adjust humidity for the perfect balance.

Grow Room Tips for Cannabis Growing.