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Force-Flowering Cannabis Outdoors: Yes, You Can Do It!

Growing cannabis outdoors can be tricky because you must rely on the natural light cycle to support your plants’ growth. But the location of your garden or the local climate might not always allow your plants to go through their entire flowering cycle as intended. That’s where force-flowering can help you achieve a perfect harvest! Here’s how.

Learn how to force-flower your outdoor weed plants.

Contents:

Outdoors, under the sun is arguably one of the best ways to grow your own weed. Unfortunately, growing outdoors can be tricky if you live far north or south or along the equator. Luckily, you can overcome some of the challenges of growing in these areas by force-flowering your outdoor plants. In this article, we’ll walk you through the process, so you can gain more control over your outdoor grow.

When Does Cannabis Flower Outdoors?

Photoperiod cannabis plants start to flower at the end of summer (following the summer solstice), once the days get shorter and the nights grow longer. Latitude obviously has a big impact on when weed flowers, as it correlates to the number of daylight hours in a particular region.

In general, however, cannabis plants will start flowering after the June solstice (June 20th or 21st, depending on the year) in the Northern Hemisphere and after the December solstice (December 20th or 21st) in the Southern Hemisphere. Keep in mind that the switch to bloom is a lot more gradual outdoors, as daylight hours decrease by a matter of minutes every day.

How Long Does the Flowering Stage Last?

How long a plant takes to flower outdoors varies depending on its genetics and its environment. In general, however, cannabis plants can be harvest-ready between September and November in the Northern Hemisphere and March–May in the Southern Hemisphere.

Why Would You Want to Force-Flower Cannabis?

When we think of outdoor growing, we tend to believe we have almost no control over the light cycle of our cannabis. But that doesn’t have to be the case. While there’s a certain beauty to letting nature run its course, sometimes a bit of human intervention can make the difference between an average harvest and a great one.

Benefits of Force-Flowering Outdoor Cannabis Plants

Here’s why you might want to consider forcing your outdoor plants to flower:

Avoid Frost

Areas far north or south of the equator tend to have long, harsh winters that set in a lot earlier than in other areas of the globe. If you’re growing outdoors in northern Europe or southern Argentina, for example, you may want to force your plants to flower a little early to avoid early winter frosts or rain destroying your harvest.

Limit Size

If you live along the equator, on the other hand, you may want to force-flower your outdoor plants to keep them from growing too large. Due to the long, consistent hours of sunlight these areas get all throughout the year, photoperiod strains growing close to the equator can take a long time to start flowering and, given enough space, can grow massive.

Perpetual Harvests

You don’t need to be living in Tierra del Fuego or Oslo to be intrigued by the idea of force-flowering your outdoor plants. In fact, a lot of outdoor growers opt to force their plants into bloom to produce multiple harvests throughout the year. Some experienced growers even produce perpetual harvests approximately every two weeks throughout the growing season.

When Can You Force-Flower Cannabis Outdoors?

If you live in a cool, temperate climate zone (like the UK, northern Europe, or far south in South America), you may face cold, damp autumns and early winters that overlap with the end of your plants’ bloom phase. To stop these conditions from jeopardising the quality and size of your harvest, we recommend forcing your outdoor plants to flower prematurely during mid-June or early July in the Northern Hemisphere and mid-January or early February in the Southern Hemisphere.

In the UK, for example, outdoor cannabis plants naturally won’t start flowering until September (approximately). In order to avoid the harsh rains and winds of autumn, we recommend outdoor growers in the UK force their plants into bloom as early as mid-June or early July. Given the cold spring in the region, you’ll likely also want to start your plants off indoors.

If you live close to the equator or in the tropics, on the other hand, you may be able to grow outdoors all year round. Given these conditions, you can essentially force your plants to flower whenever you like (local weather permitting, of course).

How to Force Cannabis Flowering Outdoors

The principle behind force-flowering outdoor plants is simple; just reduce the amount of light your plants get. How you choose to do this, however, depends on the number of plants you’re growing and the weather in your area.

If you’re growing a handful of plants on a balcony or terrace and don’t have extreme temperatures and harsh rains to worry about, a simple wooden or PVC frame fitted with a light-proof tarp might be all you need; simply pop your plants under the tarp at night and give them a full 12 hours of uninterrupted darkness to force them into bloom.

Alternatively, you could also move your plants into a garage, cellar, or shed at night; just remember that the area needs to be 100% light-proof for the plants to start flowering properly.

If you’re growing a lot of plants, you probably don’t want to lug them around every day. In this case, you may want to consider an automated tarp or roof above them. You can then use a timer to ensure your plants go undercover at the same time every day, without having to move them inside individually.

If the weather in your area isn’t so favourable during early autumn, you may want to invest in a small indoor grow tent complete with a light and fan. Once you’re happy with how your plants have vegged outdoors, bring them into the tent to finish them off without having to worry about the cold, rain, or wind.

Force-Flowering: Factors to Consider When Covering Your Plants

While force-flowering is pretty simple, there are a couple of things you’ll want to keep in mind to make sure the process goes down smoothly.

Air Circulation

When you move your plants undercover, one of the first things you’ll want to think about is air circulation. Stale, stagnant air can drive up the temperature and relative humidity around your plants, creating a breeding ground for pests, fungi, and bacterial pathogens. Whether you’re keeping them under a DIY frame with a tarp or in an indoor grow tent, make sure you have clean, fresh air circulating around the space to keep your plants healthy.

Schedule

Next, you’ll want to stick to a tight schedule. Photoperiod strains are very sensitive to light cycle changes, and a small slip-up when you’re trying to force them to flower can revert them back to veg or trigger hermaphroditism. For the best results, create a consistent flowering schedule with plenty of reminders to ensure your plants go under and come out of cover at the same times every day.

Light-Proof!

Finally, you’ll want to make sure that the structure housing your plants during their bloom phase is 100% light-proof. Light leaks during the flowering cycle can cause your plants a lot of stress and interrupt their flowering cycle. Wherever you’re keeping your plants, make sure there is absolutely no light exposure during the dark hours.

Don’t Want to Force-Flower? Try Fast-Flowering or Auto Strains

Rather than having to force-flower your outdoor plants every season, we recommend looking into strains with flowering times suited to your local climate.

Our fast-flowering strains, for example, are specially bred to flower in as little as 40 days. Our experienced breeders have developed these strains especially for growers looking to get to harvest sooner or pump out multiple harvests per season.

Alternatively, autoflowering strains are another great option, especially if you live in the tropics or close to the equator. Unlike feminized or regular strains, our autoflowering cannabis varieties are specially bred with ruderalis genetics and flower automatically based on their age, rather than changes in their light cycle. If you’re looking to pump out multiple harvests per year, our autos are the way to go.

Below are some of our favourite fast-flowering and autoflowering strains:

Candy Kush Express

A cross between Sweet Special and Royal Kush, Candy Kush Express is a well-balanced hybrid with great potency and delicious sweet citrus aromas. A direct descendant of an Afghan Kush, Candy Kush Express boasts a big, heavy stone that’ll leave you glued to the couch for hours. Finally, with a flowering time of only 7–9 weeks, few photo-feminized strains are this quick to reach harvest.

Wondering if it's possible to force outdoor weed plants into flower? Well, it is! Click here to learn everything about force-flowering outdoor cannabis plants.

Best Light Schedule For Cannabis In The Flowering Stage

The majority of cannabis plants are photoperiodic, this means they depend on a 12/12 light cycle to flower. It’s crucial you provide the correct light cycle so your plants start to flower, although depending on the strain this can change, autoflowering strains start flowering automatically and don’t depend on light.

Cannabis plants in the flowering stage have already grown their branches and main cola, and are ready to put on weight in the form of buds but to do this properly you should provide the best light for cannabis growing you can.

Failing to provide them a good amount of light in this stage will result in airy buds, low yields, and your plant can become weak and unhealthy.

1. What Is The Light Cycle In Flowering Cannabis?

In the flowering stage, the amount of light your cannabis plants receive will influence on the quality, density, and yield of the buds. This means the buds will produce more resin and grow denser the more light they receive, resulting in a higher yield.

The most common light cycle for the flowering stage is 12/12.

This is because cannabis starts flowering when they receive at least 12hrs of darkness, while still needing the maximum amount of light possible to produce buds.

Our days only have 24hrs, so after 12hrs of darkness, the maximum hours of light we can give them is 12hrs.

There is no other light cycle to flower cannabis as they need as much light as possible, giving them less than 12hrs per day will result in lower quality and yield.

2. Light Cycle For Flowering Cannabis Outdoor

Photoperiodic Plants

When flowering outdoors, you have to be really careful and plan ahead. As you may know, every season has a different light cycle and this will determine how long your plant grows before starting to flower.

To give you an example, cannabis outdoors in California only flowers from September to March. So if you were to cultivate a cannabis plant starting in April it would grow for 5 months before starting to flower, in September, resulting in a huge plant.

If you want to avoid this, you can apply light deprivation techniques, this consists of using a black tarp to prevent light from reaching your plants.

This is used by all farmers, independent of the kind of plant they’re growing, the downside is you will need a greenhouse to be able to do this, as you need to block all light from coming in and this can be really hard to achieve without a structure to firmly hold the tarp.

Autoflowering Plants

With autoflowers you won’t have any of these problems. Autoflowering cannabis doesn’t need a vegetative stage per se, it will grow and flower depending on age.

This means it’s way easier to grow them than photoperiodic plants. A really good tip is to search on the internet the amount of light you will get on each month and plan your harvest accordingly, your plants can benefit from the extra hours of light.

Even though autoflowering cannabis can flower properly all year long, it can slightly improve the quality and yield of your harvest.

3. Light Cycle For Flowering Cannabis Indoors

Photoperiodic Plants

As said above, photoperiodic plants flower in a 12/12 light cycle. When growing indoors we keep it the same, although it can be easier to flower indoors because you don’t have to plan ahead.

When you feel like your plants have grown enough, you can simply change the light cycle from 18/6 to 12/12 by adjusting your timer.

It can take a couple of weeks for your plants to enter the pre-flowering stage and show signs of maturity (pistils or pollen sacs if they’re regular seeds), but soon you’ll see beautiful buds forming.

Autoflowering Plants

For autoflowering plants, there’s actually not much to do. They flower from seed in a vegetative light cycle, by providing an 18/6 light cycle from seed, your plants will go through all their cycle: seedling, vegetative and flowering without having to change anything other than the nutrients mix (if it’s required).

If you’re wondering why this happens, it is because automatic cannabis is a hybrid cross between Ruderalis and Indica or/and Sativa.

By crossing with Ruderalis, cannabis strains can have its characteristic of automatic flowering.

4. In Conclusion

Just like in the vegetative stage, when in the flowering stage your plants need the proper amount of light, so if you want your plant to develop to its maximum make sure you buy the best weed light fixture you can. If they don’t get the amount of light they need while flowering, the buds won’t develop properly and won’t produce the maximum amount of trichomes they can, resulting in lower yields and buds with less quality.

Your plants can also get weak and have a higher chance of being attacked by pests or diseases. To avoid this, always plan ahead when growing outdoors and get informed of how the seasons are in your city, including not only the amount of light but also humidity and temperature.

If you’re growing indoors, be sure to provide a good growing environment and especially a good amount of light and the correct light cycle.

The majority of cannabis plants are photoperiodic, this means they depend on a 12/12 light cycle to flower. It’s crucial you provide the correct light cycle so