What Does Early Flowering Really Mean? Choosing the Right Cannabis Strains for Your Latitude
When shopping for outdoor cannabis seeds, one of the most common things growers look for is an early-flowering strain. But what does early flowering actually mean? And more importantly, what does it mean for your particular growing environment?
A strain that finishes in early October might be considered early flowering in Oregon, but the same strain could finish in mid-September on the East Coast. Meanwhile, growers farther north in Canada may struggle to get that same strain to finish before the fall rains arrive.
The problem is that many growers select strains based on advertised harvest dates without considering how their latitude affects flowering times.
I’m Bradley Danks, an Oregon-based cannabis breeder, and I’ve spent years selecting and growing outdoor varieties in the Pacific Northwest. Growing at approximately the 45th parallel near Portland has given me a pretty good understanding of how flowering times change with latitude, soil conditions, and environmental factors.
In this article, I’ll explain how I classify early-flowering varieties, why the same genetics can finish weeks apart depending on where they’re grown, and some techniques I’ve personally used to influence flowering times outdoors.
1. Understanding How Latitude Affects Cannabis Flowering
Cannabis is a photoperiod-sensitive plant. For photoperiod varieties, the length of uninterrupted darkness plays an important role in determining when flowering begins.
As you travel farther north or south, the seasonal changes in daylight and darkness are different. This can have a significant impact on when outdoor cannabis plants begin flowering.
For example, I grow near Portland, Oregon, at approximately 45 degrees north latitude. Many of the genetics developed around Humboldt County, California, at approximately 40 degrees north, tend to finish earlier when grown in my experience with the same genetics.
From my observations, every five degrees of latitude north can delay flowering and harvest by approximately two weeks. This is a working estimate based on my own growing experience, not a universal formula, but it provides a useful starting point when comparing growing environments.
Here’s an example of how this can affect the same genetics:
| Growing region | Approximate latitude | Relative flowering and harvest |
| Humboldt County, California | 40° N | Earlier |
| Portland, Oregon | 45° N | Approximately 2 weeks later |
| Vancouver, British Columbia | 49–50° N | Approximately 4 weeks later |
These are illustrative comparisons based on my observations, not guaranteed harvest-date conversions. Genetics, local weather, elevation, and growing conditions can all influence the outcome.
Why this matters for outdoor growers
One of the biggest mistakes I see is growers purchasing genetics based on harvest dates advertised by breeders in a different growing region.
A strain advertised to finish in late September in Humboldt County might not finish until October in Oregon. Move that same strain farther north into British Columbia, and the harvest could be pushed even later.
The problem is that growing seasons don’t necessarily become longer as you travel north. In fact, growers in the Pacific Northwest and Canada often have to contend with colder temperatures, shorter growing seasons, and prolonged Fall rainfall.
This creates an interesting situation: growers farther north often need earlier-finishing genetics more than growers farther south.
Meanwhile, growers around the 40th parallel can sometimes benefit from genetics that might be considered late flowering in Oregon because those plants can finish considerably earlier in their environment.
The takeaway: Don’t just look for an early-flowering strain. Look for a strain that flowers early enough for your particular latitude and climate.
2. My Three Categories of Outdoor Flowering Times
To make selecting outdoor genetics easier, I divide flowering times into three categories: super early, early, and late flowering.
These classifications are based on the actual harvest date rather than when the plant first begins showing flowers.
Here’s how I categorize them:
| Classification | Harvest window | General description |
| Super Early | Before September 15 | Extremely fast-finishing outdoor varieties |
| Early | September 15 – October 15 | Early to mid-fall finishing varieties |
| Late | After October 15 | Later-finishing varieties with greater exposure to fall weather |
These categories are intended as a general reference. A strain’s classification can change depending on where it’s grown.
Super early flowering strains
Super early varieties can be useful in climates with extremely short growing seasons, but they aren’t necessarily the best choice for every northern grower.
Some examples include Erdpurt, Mighty Mite, Biddy Early, and Frisian Duck.
Personally, I tend to avoid these types of genetics for my own outdoor breeding program.
The reason is that super early varieties can begin flowering so quickly at my latitude that they barely have enough time to vegetate. The result is often smaller outdoor plants with lower yields.
For my growing environment, I’d rather have a plant that has enough time to establish a substantial structure before transitioning into flowering.
Early flowering strains
This is where I focus most of my breeding efforts.
I consider September 15 through October 15 to be my early-flowering window. It provides a good balance between allowing plants enough time to grow vegetatively and getting them harvested before the worst of the Fall weather.
For my particular environment, I’ve found that the first week of October is often the sweet spot.
My preferred harvest window is typically October 3–7.
By this time, the cooler fall weather has had a chance to help ripen the flowers, often producing beautiful purple and silver coloration. At the same time, the plants have generally had enough time to develop without being exposed to the heaviest September rainfall for too long.
Interestingly, I’ve noticed that strains finishing toward the end of September sometimes seem to get hit the hardest by the September rains.
Of course, every growing season is different, but this is the harvest window I’ve come to appreciate most in my own environment.
Late flowering strains
Late-flowering varieties finish after October 15.
I don’t grow many of these because outdoor conditions in Oregon can become unpredictable by that point.
Some years, a variety that finishes during the last week of October can survive just fine if it has good mold resistance and can tolerate rain.
Other years, several consecutive weeks of rainfall can destroy an otherwise healthy crop before it has time to finish.
One example of a modern variety I’ve enjoyed indoors is Cap Junky. However, when grown outdoors at my location, it doesn’t seem to begin flowering until around the beginning of September.
That’s simply too late for my climate. A plant starting flowering that late could potentially continue until November.
It’s also worth remembering that seed populations can contain different flowering phenotypes. Most plants might finish within the expected early window, while an occasional phenotype finishes considerably later.
This is another reason I put so much emphasis on selecting and stabilizing genetics for outdoor growing.
3. How Soil Moisture and Drybacks Can Influence Flowering
One of the most overlooked aspects of outdoor cannabis cultivation is soil moisture management.
Most growers understand that genetics and sunlight influence plant growth, but fewer realize how much influence soil moisture can have on plant structure, flowering times, and how quickly flowers ripen.
This is something I became much more interested in after learning about crop steering.
Crop steering is a cultivation methodology that uses environmental conditions to influence how plants grow. Indoor growers have the advantage of controlling nearly every environmental variable, including temperature, CO2, relative humidity, light intensity, media EC, and media moisture.
Outdoor growers have fewer variables under their control, but that doesn’t mean we should ignore the ones we can manage. In particular, soil moisture is something worth paying attention to.
What I’ve Observed About Wet Soils Versus Dry Soils
Over the years, I’ve noticed some consistent differences between plants grown in wetter media and plants grown with heavier drybacks.
Here’s how I would summarize those observations:
| Soil moisture conditions | Plant structure | Flower development | General tendency |
| Wetter media | Taller plants with greater internodal spacing | Smaller buds | Later flowering and ripening |
| Drier media | Shorter plants with tighter internodal spacing | Larger buds | Earlier flowering and ripening |
These are observations from my own cultivation experience, not guaranteed outcomes. Genetics and environmental conditions still play a major role.
One of the most interesting things I’ve noticed is that managing drybacks during the transition into flowering can influence not only plant height and internodal spacing but also the timing of flowering itself.
My Ideal Soil Moisture Targets Throughout the Growing Cycle
My preferred target is approximately 10–20% media moisture throughout both vegetative growth and flowering.
I’ve found that maintaining relatively low media moisture encourages shorter plants, tighter internodal spacing, larger buds, and faster ripening. It also helps prevent excessively wet conditions around the root zone, which is particularly important when trying to avoid problems like stem rot.
Ideally, I’d like to maintain that 10–20% range throughout the entire growing cycle. However, outdoor growing doesn’t always cooperate with your plans.
During early flowering, plants can consume considerable amounts of water, and sometimes it’s difficult to keep up with watering. Depending on the weather and how quickly I can respond to changing conditions, the plants can experience heavier drybacks than I originally intended.
Later in the season, the opposite tends to happen. As temperatures cool down and the plants enter the later stages of flowering, the soil takes longer to dry out. It’s common for my growing media to stay on the wetter side, around 30–40% moisture.
Here’s a general overview of how I approach moisture management:
| Growth stage | Preferred moisture target | What I’m trying to accomplish |
| Vegetative growth | 10–20% | Encourage tighter plant structure and control excessive vegetative growth |
| Early flowering | 10–20% | Limit excessive stretch, encourage larger buds, and promote earlier flowering |
| Mid flowering | 10–20% | Maintain desired plant structure and encourage faster ripening |
| Late flowering | Often 30–40% | Adapt to cooler weather and slower soil drying |
These are my preferred targets and typical observations, not rigid requirements. Weather conditions, rainfall, soil composition, and how quickly I can respond to changing conditions ultimately dictate what happens in the field.
The important thing is understanding how media moisture influences plant development and learning to work with the conditions you have.
Understanding the Relationship Between Drybacks and Plant Structure
The first three to four weeks of flowering are particularly interesting because this is when plants experience their major stretch.
During this period, media moisture management can influence how much the plants stretch, how far apart their branches and bud sites develop, and the overall structure of the flowers.
Here’s a simplified comparison of what I’ve observed:
| Growing approach | Stretch | Internodal spacing | Bud size | General structure |
| Heavier drybacks (3–10% moisture) | Less stretch | Tighter | Larger | Shorter, more compact |
| Moderate moisture (around 40%) | More stretch | Wider | Smaller | Taller, more open |
For outdoor growers dealing with prolonged rainfall, a more open plant structure can be beneficial.
Smaller flowers, greater internodal spacing, and improved airflow can help reduce the conditions that contribute to bud mold.
This is particularly useful for growers who aren’t necessarily interested in producing large, dense flowers for hand trimming and instead plan to use their harvest for concentrates.
The important thing to understand is that you’re not necessarily trying to produce the biggest buds possible. You’re managing plant structure to achieve the characteristics that make the most sense for your growing environment.
Managing Drybacks When the Weather Doesn’t Cooperate
One thing outdoor growers need to understand is that you won’t always be able to maintain your ideal moisture targets.
During early flowering, plants can consume considerable amounts of water. If you’re growing in containers, the media can dry down quickly. If you’re growing directly in the ground, rainfall and soil composition can make it difficult to predict how quickly the root zone will dry.
Later in the season, cooler temperatures and reduced sunlight can slow the drying process considerably.
This is why I consider a soil core sampler such an important tool. Rather than guessing how much moisture is present, I can extract a sample from deeper in the root zone and make a more informed decision.
For outdoor growers, learning to work with changing weather conditions is just as important as having an ideal moisture target.
For more information about how bud structure, leaf texture, and internodal spacing influence mold resistance, check out my other article:
How to Choose Mold-Resistant Cannabis Strains for Outdoor Growing
4. Understanding Soil Moisture Levels
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To manage drybacks effectively, you first need a way to measure how much moisture is actually in your growing media.
I personally use a soil core sampler from Oakfield Apparatus.
Check out the Oakfield core sampler here
Indoor growers typically use substrate moisture sensors, such as those offered by TrolMaster, which provide a percentage readout of media moisture.
Check out TrolMaster substrate sensors here
The core sampler works differently. Instead of providing an electronic percentage, it allows you to extract a soil sample from deep within the root zone and physically evaluate the moisture level.
This is especially useful for outdoor plants growing directly in the ground, where you can’t easily determine how much moisture is present two feet below the surface.
Three soil moisture conditions to recognize
Here are three general moisture conditions I look for when evaluating my growing media.
| Moisture condition | Approximate moisture level | What the soil feels like |
| Wet | Above 90% | Soil is saturated, sticks together, and holds its shape |
| Moist | Below 50% | Soil clumps together but breaks apart easily when touched |
| Dry | Below 10% | Soil is extremely dry and turns into dust when handled |
These percentages are approximate reference points based on the way I evaluate my soil. A hand-feel assessment is not a calibrated moisture measurement, and actual percentages will depend on the growing medium and measurement method.
The important thing is learning to recognize the difference between saturated, moderately moist, and extremely dry media.
| Soil condition | What it should look like | Your description |
| Wet | Dark, shiny, sticky soil | Like a wet dog turd. Sticks together and holds its shape. |
| Moist | Crumbly soil | Clumps together but breaks apart easily. Not dusty. |
| Dry | Powdery, dusty soil | Like dry soil in the high desert. Falls apart into dust. |
Why I consider a soil probe an essential outdoor tool
The soil probe is one of the most overlooked tools in outdoor cultivation.
Being able to extract a soil sample from two feet deep gives you a much better understanding of what’s happening in the root zone than simply looking at the surface.
This is particularly important when growing in large containers or directly in the ground.
With containers, you can sometimes lift the pot to get an idea of how much water has been used. However, large pots aren’t always easy to lift, and the surface of the media can be misleading.
With in-ground cultivation, it’s even more difficult because the soil can look dry on top while remaining saturated several inches or feet below.
I like to pull a core sample before watering so I can evaluate the actual moisture conditions throughout the root zone.
After taking a sample, the hole can be backfilled with loose potting soil.
Learning how to use a soil probe takes some practice, but once you get accustomed to it, it’s a tool you’ll appreciate having available throughout the growing season.
It’s also useful for identifying overly wet conditions that can contribute to root problems and diseases such as Fusarium wilt.
5. Using Drybacks to Encourage Earlier Flowering
One of the more interesting things I’ve personally observed is that heavier drybacks before flowering can sometimes encourage outdoor plants to begin flowering a week or so earlier than normal.
I’ve seen this happen with clone-only plants that I’ve grown repeatedly over many years.
For example, I have varieties that typically begin flowering around August 10. In some growing seasons, when I’ve implemented heavier drybacks leading up to flowering, I’ve observed those same plants beginning flowering around August 1.
That’s about a week earlier than their usual flowering onset.
I’ve found this effect particularly noticeable when growing in containers because the pots can dry down considerably faster than plants growing directly in the ground.
When using this approach, timing matters. My observations involve managing media moisture during the weeks preceding flowering, rather than waiting until flowering is already well underway.
The first three to four weeks of flowering are another important period because that’s when moisture management can influence the amount of stretch and the resulting plant structure.
It’s important to understand that this is a technique I’ve observed in my own growing environment, not a guaranteed way to advance flowering by a specific number of days. Excessive drought stress can damage plants, so soil moisture should be monitored carefully rather than allowing plants to become severely dehydrated.
6. Using Different Soil Conditions to Your Advantage
Another interesting observation I’ve made comes from growing in different sections of my own outdoor field.
There is one section of the field with a completely different soil composition than the rest.
It contains considerably more organic matter, holds more moisture, and receives slightly more shade. As a result, it dries out more slowly than the other growing areas.
Over the years, I’ve noticed that this section consistently produces taller plants with greater internodal spacing and flowers that take longer to ripen.
Essentially, the plants behave as though they’re growing in a different environment, even though they’re only a short distance away from the rest of the field.
I’ve learned to use this to my advantage.
Instead of planting my later-flowering genetics in that section, I prefer to plant shorter, earlier-flowering varieties.
The additional moisture and slower drying conditions tend to encourage more vegetative growth and can delay development compared with the rest of the field.
In effect, I’m using an early-flowering variety in a location that tends to push its development later.
This is an important concept for outdoor growers: You don’t necessarily need a different strain for every section of your property. Sometimes you can use differences in soil composition, moisture retention, and sunlight exposure to influence how a particular variety develops.
7. Genetics and Plant Nutrition Matter More Than Just Harvest Dates
While flowering time is important, I don’t believe selecting the earliest possible variety is always the answer to growing successfully through the Fall rains.
In my opinion, the two most important factors are:
- Plant genetics.
- Plant nutrition.
Genetics determine many of the physical characteristics that influence how well a plant handles prolonged moisture.
Some of the characteristics I look for include:
- Narrow, spear-shaped flowers rather than extremely dense, oversized buds.
- Leathery leaf textures rather than soft, velvety leaves.
- Larger internodal spacing that promotes airflow between flower sites.
- Genetics that naturally finish early enough for the local growing season.
These characteristics can make a tremendous difference when growing in climates with prolonged fall rainfall.
You can learn more about these characteristics in my article:
How to Choose Mold-Resistant Cannabis Strains for Outdoor Growing
Plant nutrition is another major piece of the puzzle, but that’s a discussion deserving its own article.
I’ll be covering the fertilizers I personally use and recommend, along with some additional information about plant nutrition, in a future blog post.
Stay tuned!
8. My Favorite Early-Flowering and Mold-Resistant Genetics
If you’re growing outdoors in a climate where September and October rainfall can become a problem, selecting the right genetics is a good place to start.
My breeding program focuses heavily on varieties that perform well in the Pacific Northwest, where cool temperatures, prolonged moisture, and fall rains can make outdoor cultivation challenging.
Here are four varieties I’d recommend checking out:
Schnitzel Meister
Shop Schnitzel Meister Feminized Seeds
Jagerschnitzel
Shop Jagerschnitzel Feminized Seeds
Candy Rain
Shop Candy Rain Feminized Seeds
Noize Candy
Shop Noize Candy Feminized Seeds
Each variety offers something different, but they are part of my continued effort to develop genetics suited to challenging outdoor growing environments.
Final Thoughts: Choose Genetics for Your Growing Environment
The biggest takeaway I want growers to understand is that early flowering is relative to where you’re growing.
A variety that finishes in early October in Oregon might finish in September on the East Coast. The same variety could be considerably later in British Columbia.
Rather than simply looking for the earliest strain available, learn your local growing environment and figure out which harvest window works best for your climate.
Pay attention to when your plants begin flowering, when they finish ripening, and how different soil conditions affect their development.
Don’t overlook soil moisture management, either. Understanding drybacks can give you another variable to work with when evaluating plant structure and flowering behavior.
Ultimately, successful outdoor growing isn’t just about finding the fastest-finishing genetics. It’s about selecting the right genetics, managing your growing environment, and understanding how those two things work together.
That’s what I’ve spent years working toward with my breeding program here in Oregon, and it’s something I’ll continue sharing as I develop new varieties.
Need Help With Your Growing Setup?
Every growing environment is different, and sometimes it helps to have someone look at your specific situation.
If you’d like one-on-one help discussing your growing setup, genetics, or outdoor growing plans, you can book a one-hour consultation with me for $100.
Whether you’re trying to select the right genetics for your latitude, improve your outdoor growing environment, or figure out how to manage soil moisture and flowering times, I’m happy to share my experience and help you develop a plan.
Book a One-Hour Consultation with Bradley Danks
Bradley Danks
Oregon Cannabis Breeder | bdanks.com
Affiliate disclosure: Some links in this article are affiliate links. If you purchase through these links, I may earn a commission at no additional cost to you. I only recommend tools that I personally use or believe can be useful to growers.