How Long Does It Take To Grow Weed From Seed

How Long Does It Take To Grow Weed From Seed Cannabis is a genus in the family Cannabaceae, a small family of flowering plants. Cannabis sativa L. is a species of Cannabis. Depending on the Growing a weed crop is one of the most rewarding experiences cannabis enthusiasts can have, here is more info on flower cannabis: The idea of the following article is to provide you with valuable information about the growth of marijuana, its phases and some tips. First, we recommend

How Long Does It Take To Grow Weed From Seed

Cannabis is a genus in the family Cannabaceae, a small family of flowering plants. Cannabis sativa L. is a species of Cannabis.

Depending on the taxonomic treatment adopted, Cannabis sativa L. can include up to three subspecies: Cannabis indica, Cannabis sativa, and Cannabis ruderalis.

  • Cannabis Sativa: Tall, long branches, large narrow leaves. Thought to originate from East Asia. Domesticated for stem fiber and/or oil seed in Western Asia and Europe. Naturally low tetrahydrocannabinol (THC) and high cannabidiol (CBD).

The majority of modern “strains” (more accurately chemovars, cultivars, or varieties) will be a hybrid of the three.

Selecting Your Variety

Feminized vs. Regular Seeds: To reduce the likelihood of producing male plants, seeds may be “feminized”, meaning they were produced by female plants intentionally pollinated by another female plant induced to grow pollen sacs. Therefore, feminized seeds are more likely (~99%) to produce a female plant. Starting from regular seeds will result in both male and female plants, generally at equal rates.

Outdoor vs. Indoor: Most seeds purchased from seed banks will be used for the purpose of growing domesticated, indoor cannabis. While some cultivators prefer to grow outdoors, growing cannabis for personal use in Illinois must be done in an enclosed space or indoors. Purchasing seeds bred for indoor growing is recommended.

Flowering Time: Every cannabis variety will have its own unique set of characteristics, including different flowering times. Shorter flowering times are typically preferred to increase frequency of harvest and, therefore, overall yields. Flowering times are typically two months but can be longer. Consumers should be wary of seed banks underestimating flowering times to improve marketability.

Photoperiod vs. Autoflower: Naturally, the cannabis plant will complete its life cycle in one growing season, meaning it will begin flowering as the days get shorter. This natural cycle is referred to as “photoperiodism”. Photoperiod seeds will result in plants that must to be triggered to begin flowering. Alternatively, “autoflowers” are varieties specifically bred to have a nearly non-existent vegetative stage and will begin to pre-flower almost immediately after the seedling stage. Autoflowers are generally smaller plants as they have been bred with the Ruderalis subspecies.

Cannabinoid Ratio: A ratio is the amount of one cannabinoid relative to another, typically the ratio between THC and CBD. For example, a variety that contains 10% THCa and 10% CBDa would have a 1:1 ratio. A variety that contains 6% THCa and 12% CBDa would have a CBD to THC ratio of 2:1 or THC to CBD ratio of 1:2. Cannabis users with lower THC tolerances should seek these balanced varieties with more moderate effects.

Terpene Profile: Terpenoids or terpenes are the fragrance molecules that give cannabis its unique aroma and flavor. The combination of terpenes, cannabinoids, and other plant compounds may provide synergistic effects and potentially enhance medicinal value. This synergy is often referred to as the “entourage effect.” Distinct ratios of cannabinoids and terpenes provide a meaningful profile of the plant’s genetic identity and chemical composition but also provide a better understanding of expected effects.

Essential Nutrients

As a rule of thumb, nitrogen and potassium uptake are greatest during vegetative growth. Higher rates of potassium and phosphorus are needed during the flowering stage. Adequate feeding can be done with two main N-P-K blends for veg (5-2-1) and flowering (1-3-7).

Nitrogen (N): Most important during vegetative growth. Reduce nitrogen during flowering.

Phosphorus (P): Helps with root development and flower formation. Increase during flowering.

Potassium (K): Moves sugars from leaves to flowers and promotes cell hydration. Large requirement for K during flowering.

Calcium (Ca): Used most during vegetative stage. Increases pH.

Magnesium (Mg): Important throughout plant cycle but in lower amounts.

Sulfur (S): Important throughout plant cycle but in lower amounts. Lowers pH.

Micronutrients: Includes metals (iron, manganese, zinc, copper, nickel), chloride, molybdenum, and boron. Sources of micronutrients include dead plant tissues, compost, and manure.

Understanding training techniques, covered in our workshop series

Managing pH

If the pH of your growing medium is too low or too high some nutrients may be locked out, meaning the plant will not be able to absorb them. pH is a scale used to determine how acidic or basic (alkaline) a solution is.

If pH becomes too alkaline (above 7.5) or too acidic (below 5.5), it will inhibit nutrient uptake. Correct pH level (6.0-7.0) and consistency in pH level will allow the plant to better absorb nutrients.

Test the pH of your runoff water to check whether your soil is within acceptable range, too acidic, or too alkaline. Make sure to use pH corrected water when watering. Adjust with lemon juice or vinegar to decrease pH.

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Growing in Soil vs. Hydroponics

  • Soil is more forgiving
  • Soil is less susceptible to pH swings
  • Well prepared soil will provide nutrients for the plant for a few weeks at a time without incessant feeding
  • Typically, with over-the-counter soils and soil-less mixes, there is enough plant nutrition for 4-6 weeks of growth
  • Hydroponics is susceptible to pH swings and requires constant monitoring- one mistake can ruin entire crop within a day
  • Hydroponic systems have a higher startup cost and larger learning curve

Growing in Soil

Healthy, strong, large root systems are the most important factor when it comes to growing. The larger the root system, the larger the plant and bigger the yields.

When planning the grow, use the largest possible pots, wider rather than taller if height is a issue. The bigger the pot, the bigger the plant will grow. The smaller the pot, the smaller the plant will be.

Most pre-mixed soils and soil-less mixes will come with enough nutrients to last about 4-6 weeks. Eventually, the plant will absorb all of the nutrients in the soil, which can be supplemented or amended with additional nutrients.

Trichome Inspection

Trichomes are a good guide for when to harvest the plant, but don’t all mature at the same time. Monitor and prepare to harvest when the majority of trichomes are either cloudy, amber, or a mix of both.

Inspection requires a hand held microscope/magnifying glass (30x minimum). It can be difficult to keep steady. It’s recommended to cut off a small part of flower and hold the microscope to the flower and check the trichomes.

Inspecting trichomes with students of Home Grow Chicago’s cannabis growing class

If trichomes appear as clear/opaque under the microscope the potency is still developing and not ready. The trichomes will transition to cloudy/milky and finally turn amber.

Why Home Grow?

Besides experiencing the joy of consuming your own home grown cannabis and knowing exactly what goes into your plant, developing a community of growers and meeting new people can be one the best things about home growing.

Will your consumption costs be offset by home cultivation? The average person spends between $500-$2500 on cannabis every year, and one ounce of cannabis costs between $100-$450 at the dispensary, depending on your location. The average yield per plant may be between 2-4 ounces for most beginner but can reach upwards of a half pound if you procure high-quality genetics and give the plant proper care. Taking a start up cost of $600 and your utility bill into consideration, yielding one pound total (16 ounces) will save you at least $1,500.

Home cultivation does not come without challenges. Our cannabis growing workshops in Chicago are designed for first time growers and guide those new to indoor cultivation through the fundamentals of growing medicinal plants for personal use. If you are wondering where to begin, consider signing up for our workshops.

How Long Does It Take To Flower Cannabis?

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August 23, 2021 by Pure Oasis

Growing and maintaining your own personal weed crop is one of the most rewarding experiences cannabis enthusiasts can have. While the process itself can be very time-consuming and requires some studying, it is not impossible! Plenty of people around the world have undertaken this process and gotten great results from their crops.

In this article, we will walk you through the growth process and also explain how growth times differ between different types of weed. We will also discuss the different grow types and compare the different methods so you can determine which one is best for your situation.

Let’s start with the grow times for the different types of cannabis:

Sativa Grow Time

Sativa plants are characteristically tall and thin. Some outdoor varieties of Sativa plants have been known to grow as tall as 20 feet! This is due to the fact that Sativa varieties of cannabis are native to regions that surround the equator, so they experience the same day length throughout the whole year. This leads them to have shorter growth periods compared to other types of cannabis. The average growth time of Sativa plants is about 6 months in total.

Indica Grow Time

Indicas can be easily spotted because they are pretty much the opposite of Sativas as far as appearance. The flowers of Indica plants are typically shorter and stubbier than their tall, thin counterparts.

They also have short flowering stages, which makes them a popular choice for experienced cannabis breeders or anyone who wants a quicker cycle. Indoor growers enjoy raising them because their shorter flowering periods mean they can produce more per year, while outdoor growers can cultivate them without worrying about climate issues or early winters. On average, Indica strains have a flowering state that lasts 8 to 12 weeks.

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Hybrid Grow Time

Hybrids are the result of crossing Indicas with Sativas. While some prefer to cultivate either pure Indica or pure Sativa strains, most growers are cultivating hybrids due to the interesting and fun variants that are produced.

Hybrids grow quickly during the vegetative stage just like Sativa strains but have shorter flowering periods which is common in most pure Indica strains. Hybrids have an average flowering time of 6 to 10 weeks until they are ready to be harvested.

How To Prepare For Growing Cannabis

Growing your own weed or starting your own operation can be exciting, but this doesn’t mean you shouldn’t approach the process prepared!

Here are a few important things to keep in mind before you start growing weed:

Learn About The Basics

While you do not necessarily need to be an expert or a daily user, it will be very helpful to learn about the plant itself, what nutrients it needs, its lifecycle, and other basic facts about the plant. We recommend reading a book regarding how to grow marijuana or on the basics of the plant itself to help you be better prepared.

Understand The Scale Of Your Grow

This is an important thing to consider before you begin: think about the power requirements and the overall size and scale of what you want to build. We recommend starting small if you are independent in order to get it right and get a feel for how the process works before you begin to scale up.

Know The Costs

Be prepared to spend a significant amount of money when planning to grow weed. Buying quality marijuana seeds is not a cheap investment, and you’ll also need to invest in decently expensive equipment as well.

The kind of equipment needed to grow weed indoors will depend on the size of the grow and the preferences of the grower. Note that the cost of cultivating weed will vary from person to person. Some can get great results from a simple setup that costs no more than $100, while others may need to spend up to $10000 for their grow operations.

Overall, the time it takes to flower cannabis depends on the strain of weed you are attempting to grow and the method you are using. If you want to grow Sativa strains, you may want to brace yourself for a longer haul, while Indicas will flower much more quickly. As you progress in your grow skillset, try combining strains in order to get the most out of your grow times and the seasons of the year.

Whichever method and strain you go with, good luck and have fun!

Get Cannabis Flower From Pure Oasis

Pure Oasis is Boston’s original cannabis dispensary. Their boutique dispensary offers a user-friendly experience with knowledgeable staff and a wide variety of high-quality cannabis products.


The idea of the following article is to provide you with valuable information about the growth of marijuana, its phases and some tips. First, we recommend you not to harvest your plants as soon as possible. Each variety and each strain follow a life cycle that we must respect if we want to achieve optimum development and a quality product.

The time of germination, growth and flowering of marijuana is relative; each variety follows a different tempo, even each strain, which is why it is impossible to determine or pre-establish a generic time for cannabis.

How long does it take to grow marijuana?

Anyway, we will try to give you some advice to guide you as best as possible and that you can control the growth of your crop. If we want to specify about the life cycles of the cannabis plant, we must highlight three main phases: germination, growth and flowering.

The germination process.

First, there is the germination process. This is usually the process that people give least importance to, but, it is of vital importance because if we do not do it correctly we can spoil the seeds. The techniques for germination are very diverse, from the typical technique that uses a napkin or wet paper, to the use of stimulators or planting the seed directly in soil, on a jiffy disc or in a glass with water.

Marijuana seed germination

The best thing to do is to use the napkin or wet paper and, as for the time, to re-emphasize that it is relative. It will not only depend on the conditions of water, humidity or oxygenation, we will also have to consider the quality of the seed, its fertility, the variety or strain in question. However, the seeds usually take between 24 and 72 hours to germinate. Sometimes we find seeds that can take 5,10 or 15 days to arrive.

The Growth or Vegetative Stage:

Secondly, we find the growth or vegetative phase. This phase is central to the development of the plant and therefore one of the main concerns for cannabis growers. It is in this phase, when the seed has been germinated and planted, in which the plant acquires its morphology and its optimal size to later be able to produce the flowers (our harvest).
During this phase the plant needs a lot of direct sun-light as it is developing.

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Now, we are in the greatest photoperiod of the plant, between eighteen hours of light by six hours of darkness. The hours of darkness are also of vital importance as they will produce the correct exchange of gases. This exchange is essential for the optimal metabolic development of the plant cells of our strains. The length of time that plants should be growing will be determined by various factors such as environmental (temperature, light, humidity), plant (variety and strain) and external factors (fertilizers, soil quality or the grower’s experience).

Determining factors:

Another factor will be whether the plant is regular or autoflowering. In the second case, all phases are shortened, as they are genetically engineered plants designed to develop as quickly as possible. On the other hand, it will also depend on whether we plant it outdoors or indoors. It should be noted that in indoor cultivation also shorten the phases, and depending on our luminous power, the times will be lengthened or shortened even more. Therefore, to pre-establish the time of growth is very complicated; to general features we could say that in an interior the autoflowering seeds we would let them grow between 3 or 4 weeks, depending on the culture technique, and 6 or 8 weeks for the feminized or regular seeds.

The flowering phase:

On the other hand, we have the third phase, flowering. This phase is the last stage of plant development and one of the most important. The beginning of this period will be determined by the hours of light, outdoor, or by the development of the plant during the growth phase, indoor. Since the interior can control the moment in which we want it to start blooming, we must wait for the plant to have the right physiognomic characteristics to produce good buds.

In autoflowering varieties, the beginning of the flowering phase will mark them themselves, while in feminized or regular seeds, we should be the ones who, through the change of photoperiod, point out when they should start to flower (setting 12 hours of light and 12 hours of darkness). Another issue is outdoor, where the calendar will determine the tempo. As for determining the end of the flowering process, point out that it is something completely subjective. There are people who prefer to wait more or less, although there are certain factors that can give us a general idea.

End of Flowering and Harvest

End of Flowering and Harvest:

Firstly, the development of buds, which should fatten to cover most pistils. Secondly, the correct maturation and oxidation of the buds, which will be determined by the color and shape of the pistils and trichomes, which may be orange or brown in color. Finally, the hardness of the bud can also be an indicator of the time of cutting, although there are varieties that produce softer buds and therefore this indicator does not always work. However, we can point out that autoflowering plants will usually complete their flowering in eight weeks, whereas feminized plants can take up to ten, twelve or even thirteen weeks.


By way of conclusion, as we have seen throughout the article, the duration of the periods is very relative and depends on a great variety of factors. However, some generic and approximate calculations can always be offered to guide the grower.

We establish, therefore, that for the correct development of an autoflowering marijuana plant, we must wait approximately three months; while for a feminized plant, the period is extended to four or five months. These have been some advices to help you with your crop, since Gea Seeds recommend you perseverance and a lot of patience to get the best result.


RD 24 October, 2019, 6:29 pm

I was told that once a plant has flowered that they die, it can never flower again, is this true

GeaSeeds 25 October, 2019, 7:48 am

Hello RD! Cannabis plants can live more than 5 years!

Kenpachi 23 June, 2020, 2:34 am

I have been doing this from 3 months but yet no flowers on my plants….. I’m growing them outdoors…. And seeds are regular…. Can u give some advice when will it start flowering…. Today 3 months are over since I have put seeds in wer napkin……

GeaSeeds 23 June, 2020, 9:54 am

Hello Kenpachi!
The flowering does not depend on the number of months since the germination.
The flowering depends on the hours of daylight.
In August and September (Northern Hemisphere), when it starts to decrease the hours of the sun, the plant will start to bloom.

Arefff 2 October, 2020, 1:15 pm

My bush has just started flowering, will it take me a few weeks to cut out a garden?