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Cannabis Flowering Stages Week by Week (With Pictures) – An Ultimate Detailed Guide

A typical cannabis plant can take anywhere between 5 to 8 months to grow. These plants generally grow in two distinct phases – the vegetative phase of growth, and the flowering phase of growth. There is an intermediary pre-flowering phase in between but that isn’t something that goes on for long so it can be ignored for the purpose of this article. Growers need to understand that flowering is a process that can take about two months to fully happen.

However, before we get into the actual flowering process, it is crucial to know the entire life cycle of a plant: the cannabis plant starts off as a seed, then enters the germination phase from where it becomes a seedling. After providing long hours of light to the seedling, it enters a phase of rapid growth where you will witness the plant grow in size, the stem begins to become thicker, and the foliage begins to increase too. This is the vegetative phase of growth.

Once the vegetative phase of growth is over, the plant will begin to enter the pre-flowering phase where the buds will begin to emerge and become prominent. This is a short-lived phase after which a plant enters the ‘flowering’ stage of growth. Here, the flowers begin to emerge and this is something that goes on for about two months. This is the phase that we will be addressing in detail in this article.

Cannabis Flowering Stages Week by Week

For the purpose of this article, we have broken down the flowering phase into three distinct phases – the early-flowering stage (Weeks 1, 2 and 3), the peak flowering stage (weeks 4 and 5), and the pre-harvest phase (Weeks 6, 7 and 8).

The early flowering stage is where you will begin to notice that the buds are showing up and you will be able to tell the males from the females. During the two weeks of peak flowering, the buds will begin to get bigger and fatter and the pistils will change colors. In the final three weeks, you need to begin the harvest prep as your plants will be ready for harvest by the end of this process.

While some cannabis plants can take more than 8 or less than 7 weeks in the flowering phase, we will go with the average number here, which is eight weeks. Here’s what your plant goes through over the eight weeks of flowering:

Week 1

This is a phase where your plant is going through a lot of changes. You will notice that there is a sudden increase in the height as well as the width of your plant. In fact, it isn’t uncommon to see some strains of cannabis plant actually become double their size during the first few weeks of flowering.

Another thing that you might notice at this phase is that your plants are becoming much greener, particularly at the top. This is a time when new colas are coming up and rapid growth is happening on the upper portions of the plant. The plant is also going to become much sturdier here as the stem begins to harden quite a bit at this point.

This is also the time that you begin to start using some training techniques such as Low-Stress Training (LST) by bending the upper portions a little to get a larger canopy that allows the grow lights to function better.

Week 2

When you begin to notice that the plant has begun to grow rapidly, one thing that you need to take care of is that it will also require more nutrition. During the first week, we recommend you do not change your nutrient schedule right away, but actually wait till the second week for that. This is because you don’t want to shock your plant by changing its diet just when it has begun to grow.

One of the key things that generally happens during the second week is that white pistils begin to appear. These are white hair-like structures that form at the junctures where fan leaves begin to come out of the stem. It is these pistils that eventually grow into buds. This is also an indicator of which plants are female plants – only the females will get these pistils and the male plants need to be removed from the growing area else they may pollinate the female plants and will cause them to grow seeds.

By the end of the second week you can clearly tell the male and female plants apart and make sure you’re growing only female plants by the time the third week begins to set in. While weeks aren’t really a hard marker here, we suggest you make a judgment call here and do it as soon as you begin to see the difference in the genders.

Week 3

This is the week where the rapid growth that we’ve seen in the first two weeks begins to slow down and by the end of the third week, your plants are most likely to be fully grown. Sometime towards the end of the third week of the flowering stage, you will also begin to notice that the pistils, which used to be fine strands of white hair, are now beginning to look more like buds.

Something that you need to keep in mind about this phase of the growth cycle is that this is a time when your plants will spend a lot of energy and need a lot of nutrients. This is the peak consumption so make sure that you are providing nutrients in an appropriate amount. However, also keep an eye out for nutrient burns, which often occur at this phase because the overall intake of nutrients has shot up.

Week 4

As we progress into week 4, the biggest difference from week 3 is that the buds will start to get a little bigger. The pistils will still be sticking out of the buds, but the buds will continue to get fatter. However, at this phase, you should really not expect your plants to grow any taller or wider. All the focus is now on the buds and the flowers – as the plant is no longer spending energy on growing bigger, but on generating buds and flowers.

Somewhere in the fourth week, you will also notice that the smell is getting much stronger. This is because this is a phase where trichome production has shot up and the buds are producing more trichomes. This will lead to a very strong and pungent smell which you will need to contain with the help of fans and filters else it might raise a suspicion in people living nearby.

Week 5

The fifth week is when you are almost hitting peak flowering. This is a time which growers usually love, as the fruits of their labour over the past several months are finally becoming visible. Not only can you see them, but you can smell them too – as the trichome production has hit peak levels by this time, and the odor is really strong and overpowering. You will need to make sure that your ventilation system is very good and that you are using a lot of carbon filters and other similar agents to make sure that all the smell is dealt with.

Your plant will begin to get heavier at this time as the buds are getting fatter. You will notice that some branches have begun to droop due to the weight. Even till the fifth week you might see some new buds emerging out of the colas.

A significant change that becomes prominent around this time is that the pistils that come out of the buds will slowly begin to change color. What was white for so long will gradually start turning into a brown or amber-colored strand of hair. The trichomes too will no longer be translucent but will start turning a little opaque and white around this time. All of these are a good sign – an indicator that harvest is just a few weeks away.

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Week 6

This is the week where you will notice that your buds have begun to ripen. By this time there is absolutely no growth in the leaves and foliage, and your plants are as green as they are going to be. All the energy is now going into the development of the buds and flowers. Something to keep in mind here is that since all vegetative growth has now stopped, do not provide any nutrients to your plants which are meant to boost vegetative growth. A majority of your nutrients should now be flower boosters.

This means that you need to reduce the Nitrogen input rather significantly. An excess of nitrogen at this point would not only begin to cause nutrient burns in the plants, but it might also lead to the plant returning back to the vegetative phase and stop the flowering process. The sixth week is a caretaker period where you need to make sure that you are providing your plants the right kind of nutrients.

Week 7

Late into the sixth week or early into the seventh, you are going to witness another change in your plants – the leaves on the lower portions of the plants will begin to turn yellow and fall. However, you shouldn’t worry too much about this as it is a very normal process around this time in the plant’s life cycle. In fact, this begins to happen to some strains as early as late-fifth or early-sixth week too.

Another interesting thing begins to happen in the seventh week – you will notice that smaller buds begin to form alongside your existing buds. This doesn’t necessarily happen with all strains, but certain strains do have this happening. This generally happens when the plants are stressed out due to excess light or heat.

Around this time, also make sure that your plants aren’t so tall that they are very near to the grow lights. If you feel that the lights are a little too close, move them higher so that there is no light burn that is caused. Lastly, also make sure there is sufficient air flow in your grow room or your grow tent so that all the heat is countered. However, with air flow, you must also take care that the plants are very pungent at this phase and they will smell .. a lot!

Week 8

As we enter what is generally the final week of flowering, this is the time you should begin the process of flushing your plant. In fact, you can actually start it from the middle of the seventh week. However while ten days is an ideal time, you should at least flush it for seven days. Flushing, for those who may not be aware, is the process where you wash off all excess nutrients from your plants.

The way to flush your plants is to stop giving them nutrient solution and provide them only with regular water. This will make sure that the plants consume all the excess nutrients that they have stored in their body. This makes sure that the taste is good, but also ensures that there’s no nutrient deposit left in the plant’s body. Further, this gives your plants a very natural and plain taste. Nutrient deposits actually make it pretty harsh to smoke.

Lastly, you need to keep checking your plants this week for how their trichomes look. Use a magnifying glass or a jeweller’s tool to observe how your trichomes are looking. If they are milky white or amber, this means your plants are good to go for the harvest. If they are still transparent, you might want to wait for another 3-4 days before you head into the final harvesting process.

Things to Take Care of During The Flowering Stage

During the flowering stage, you need to take care of the following things:

OG Kush Auto Cannabis Strain Week-by-Week Guide

OG Kush is the most popular cannabis strain up to this day, although there are various theories about its origins, the most accepted one begins back in 1990 in Florida, where a grower known as “Bubba” bought a bag of mixed seeds.

What he didn’t know was that in that bag of seeds he would find a very special plant, this unknown cultivar that he thought to be a Chemdawg phenotype had lots of potential and he crossed it to a Hindu Kush landrace from Amsterdam, and due to the unique terpene profile and strong high, he called it “Kryptonite”.

“Kryptonite” (aka “Krippy”) became very popular among Bubba’s friends and clones started going around until one of them ended up in the hands of Josh D.

At that time, Josh D was in LA and had a lot of friends that were very good cannabis growers so he gave them all a couple of clones and started a phenotype hunt to get something similar to what he had seen before.

After a couple of years, he was able to develop what is known nowadays as OG kush, a name the strain got because of the OG status, due to it being one of the first famous strains.

2. Specifications

The auto version of this old-school classic comes from the original OG Kush clone, straight from Cali, and was selectively bred with our own autoflowering genetics, resulting in one of the most potent autoflowers from Fast Buds’ original line.

This is a true expression of the famous strain, tested at 23% THC, OG Kush Auto grows up to 110cm, and thanks to her Indica heritage, you can expect up to 550gr/m 2 of potent medicine in around 63 days.

It’s a great choice for Indica lovers or medicinal users, the pungent terpene profile of citrus, earthy, and kerosene overtones which comes hand in hand with a potent corporal high that will leave you couch-locked for long and easily help you sleep.

3. Week-by-week guide

As always, here’s a general guideline on the conditions throughout this grow report, this week-by-week guide serves to give growers an idea of what to expect when growing Fast Buds’ genetics.

Grow Specifications
Light Fixture: LED
Light Cycle: 18/6
Humidity: 45% – 65%
Temperature: 21-27°C
Grow Space: Indoor
Nutrients: Synthetic
PH level: 5.8 – 7.0
Seed to Harvest: 9 weeks

Remember that this is a written timeline to help you, even though you can follow these specifications, you should adjust the conditions depending on your style of growing and what you have available.

Week 1 – Germination

This grow cycle started by germinating a couple of seeds of our OG Kush Auto by soaking it in water for 24hs and then transferring it to a jiffy pellet.

This is what we always recommend and is a way to improve the chances of germination because the water slowly moistures the shell, making it easier for the seedling to come out.

Depending on your growing style, you can germinate your seeds directly in the medium or, like the grower did, jiffy pellets if you prefer to, just ensure you keep the temperature in between 18-25°C and the humidity levels around 70%.

Height: 1cm
pH: 6.8
Humidity: 80%
Temperature: 27°C
Watering: 65ml

If you’re germinating in jiffy pellets, as soon as your seedling has come out of the soil you can plant the whole jiffy in the medium of your choice.

Have in mind that if you are growing in hydroponics setups you shouldn’t germinate in jiffy pellets, if you’re going for hydro it’s better you germinate your seeds in rock wool cubes as it’s more appropriate for soilless grows.

If you’re germinating in a paper towel, as soon as the radicle has approximately 3cm, you can plant it, just make sure it’s moist enough so your seedling comes out of it without any problems.

It’s essential you keep not only the temperature and humidity levels controlled, but also make sure your seedling is getting light, although not too potent.

If you see your seedling is stretching too much, it can be bad and the stem may end up breaking so check if the light is at the right distance (or intensity) from your plant.

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Remember that seedlings don’t need that much light, you can have them under weak CFLs and they’ll grow properly, this is a good way to save up on the electricity if you have a lot of baby plants, just make sure that after the first couple of true leaves are fully developed, you transfer them to a stronger light.

Week 2 – Vegetative stage

When the first pair of true leaves have completely developed, your plant is officially in the vegetative stage, this is when you will have to start feeding your cannabis plants a light nutrient dose.

It’s recommended to feed in a 3-1-2 nutrient ratio, these numbers refer to the NPK amount the fertilizer contains, which are the macronutrients your plants need to grow properly.

Height: 5cm
pH: 6
Humidity: 70%
Temperature: 25°C
Watering: 100ml

Cannabis plants need more Nitrogen during their growing phase so following this ratio will ensure you are giving everything your plant needs at the proper amount.

“The 3 of these little ladies are doing great and growing strong from all I can see. Showing no signs of nute burn and still only watering 1 solo cup of water per day. They have minimal stretching which is always nice and temps have been staying steady. Feeling excited about this week as all 3 are starting to take off. Happy Growing.”-Chubbs

Remember that when feeding your plants, you should always check the pH, now this is usually not necessary with organic feeding but with synthetic nutrients, it’s a must, the pH level is what determines which nutrients your plants can absorb so if you don’t check and adjust it, your plants may not be able to absorb minerals, even though you are feeding them properly.

As you can see, in the photo above the growers were feeding around 100ml of water, despite seeming too little, it’s essential you avoid stressing your autos because you can end up stunting growth and affecting their size, which can result in smaller yields so it’s better to feed with less water than usual and water if needed.

Week 3 – Vegetative stage

Depending on if you transplanted your seeds and how you’ve watered them, your seedlings should have around 3-4 pairs of leaves, so now is the time to start your plant training (LST or HST), although have in mind that you should only top or fim your plants if you have a bit of experience.

Height: 15cm
pH: 6
Humidity: 55%
Temperature: 28°C
Watering: 250ml

If you don’t want to risk it, you can start low stress training your plants by tying down the branches, or growing in a SoG or Scrog so the light can reach all of the branches (and future flowering sites) equally.

In this case, the OG Kush was left to grow without any form of training so you will see it get quite bushy along the grow journal.

Remember that autoflowers can get stressed easily so make sure you train them carefully and pay attention to the signs your plants give you.

Also, due to the bushy foliage, pests can be attracted to your plants so check them every day, if you think your plants are too bushy, you can defoliate slightly but have in mind that just like plant training, defoliation should be done gradually.

It’s recommended you remove up to 2 leaves at a time and repeat after 3-4 days if needed and if your plants don’t show any signs of stress.

Week 4 – Vegetative stage

By the fourth week, your plant should have grown quite a bit and already has the roots established so you should be able to see new growth fully developed day after day.

“. I can’t get over the increase in growth this past week . I decided that because it was my first autoflower grow that I wouldn’t Top or F.I.M. the plant in an attempt to see it grow to its full natural ability and structure as space isn’t so much an issue.”-Sawyer1909

Height: 25cm
pH: 7
Humidity: 65%
Temperature: 25°C
Watering: 500ml

As said before, you should gradually increase the nutrient dose and by now, you should be feeding a full dose of Grow nutrients, this is the last week before the pre-flowering stage so it’s essential you take good care of your plants so they grow properly and are able to withstand the fat buds they’ll develop in the flowering stage.

If you’re not growing regular seeds, soon you’ll be able to sex your plant but if you’re growing feminized seeds, in the next days you’ll see signs of female flowers.

“After watching a video on how a grower tucks his leaves in rather than LST or HST methods due to the fast lifespan of Autoflowers and not wanting to stunt or stress them in the short veg period before preflower and flower . and it worked tremendously as the canopy evened out and the shadowed growths began to sprout up.”-Sawyer1909

As you can see in the pictures above, the flowering sites have started to turn light green, this means your plant is almost ready to start producing stigmas (hairs) which means your plants is a female and will soon start developing beautiful buds.

Week 5 – Pre-flowering stage

After a couple of days of the flowering sites turning light green, you’ll see the first signs of stigmas, these stigmas develop on the calyxes and as your plants grow, the calyxes will start to swell and the stigmas wilt and turn brown.

A couple of days before the pre-flowering stage you should give the first dose of Blooming nutrients, just like with Grow nutrients, you should start with a lower dose and gradually increase it.

Height: 35cm
pH: 6.5
Humidity: 55%
Temperature: 34°C
Watering: 600ml

You will have to start feeding Bloom nutrients in a 1-2-3 ratio while slowly decreasing the dose of Grow nutrients throughout a couple of days until you’re just feeding Bloom.

The Bloom nutrients provide a small amount of Nitrogen and more Phosphorus and Potassium so your plant can still develop green matter while being able to property produce buds.

As you can see, throughout the week, your plants will slowly show stigmas and start producing trichomes, this is when you want to install a carbon filter because your plants will start smelling strong.

You can still get away for a week or two but have in mind that this strain smells quite strong so you’ll definitely need it.

Also, if you did any kind of training that involves tying down the branches or cutting a certain part of your plant, you should stop now, training your plants during the flowering stage can extremely stress them so unless you’re growing similar to Scrog (with a trellis net), you should remove the ties or stop topping (or fimming).

Week 6 – Flowering stage

By week 6 from seed, you’re officially in the flowering stage. If you haven’t installed a carbon filter, you’ll definitely need it by now, so make sure you have one ready to go or if you’re growing outdoors, you can use companion planting as a way to help mask the cannabis smell.

Height: 45cm
pH: 6.5
Humidity: 55%
Temperature: 35°C
Watering: 900ml

Also, if you didn’t see a lot before, now you’ll start to see an abundance of trichomes in the buds and in the surrounding leaves, meaning your plant is full-on flowering.

Organic matter attracts pests so, especially if you’re growing in soil, so check your plants for bugs every day, ideally a couple of days a day.

Remember that some bugs can even rot the buds, ruining your harvest, so if you’ve grown in the same place before and you know bugs could be a problem, you can hang a couple of yellow sticky papers in your growing tent or spray your plants with a tiny amount of organic pesticide to avoid any kind of bugs.

Week 7 – Flowering Stage

The seventh week of your OG Kush Auto marks the second half of the flowering stage, by now your plants should look beautifully frosted and smelling super delicious but there won’t be a huge difference other than fatter buds and more and more trichomes.

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Height: 50cm
pH: 6.4
Humidity: 50%
Temperature: 29°C
Watering: 1100ml

By now you should already be feeding a full dose of Bloom nutrients and especially, make sure your plant isn’t hungry or showing signs of deficiencies.

Depending on the medium you’re using, you should also see if your plant is getting Calcium and Magnesium, if you’re growing in sterile mediums (like coco fiber) you should use Calmag supplements but if you’re growing in soil it’s most likely you won’t need to.

Also, it’s extremely important you check for bugs, especially at this stage because some bugs can hide inside the buds and start eating them from the inside, so you’ll only be able to see the infestation once your buds are starting to rot.

There’s no need to worry if you don’t see anything odd but if you start to see white, yellow, or brown spots on the leaves take your time to check your plant thoroughly, if you have bugs you’ll probably see them on the underside of the leaves.

Week 8 – Flowering stage

This week marks the week before the last of this grow guide, by now the buds should look almost done, with dense buds covered in long white hairs and an intense trichome production, depending on the light fixture you’re using, the stigmas may already start to turn brown and wilt but don’t worry, your plants aren’t ready just yet.

Height: 65cm
pH: 6.4
Humidity: 51%
Temperature: 21°C
Watering: 1200ml

The standard practice to know exactly when to harvest is by looking at the state of the trichomes so get a loupe ready, some growers even use their phone’s macro mode but a 10x jeweler’s loupe is the best tool to do this.

Depending on the type of nutrients you’re using, you’ll also want to start flushing your plants with plain pH’d water to start removing the excess nutrients in the medium and roots.

As you can see, the flowers are already looking beautiful and even though you may want to harvest now, they still need a couple of days before the trichomes haven’t matured yet so you’ll get high but the effect won’t be as potent as when they reach their full potency.

Week 9 – Harvesting

After waiting for long, you’re now in the last week of your grow cycle and the time to reap your rewards is near. By now you should be flushing and see the big fan leaves slowly changing color, some turn yellow, others can show purple or red tones, by either way, this is a sign that you washed the medium and roots and it’ll only take a couple of days to start chopping down your plants.

Height: 75cm
pH: 6.4
Humidity: 51%
Temperature: 21°C
Watering: 1200ml

As said in the specifications at the beginning of this article, the OG Kush Auto can grow up to 110cm but, unfortunately, due to overwatering this plant grew shorter than usual but as you can see, still produced huge buds.

A couple of days before harvesting you should get your drying room ready, not everyone has a room dedicated to drying their cannabis so if you’re drying in a cardboard box, in a closet, or even in a growing tent, you should start getting this ready, it won’t take long until your plants are completely mature.

“The OG . began to gain weight day after day more and more. I blocked all the nutrients starting only with flawless finish. I will give my girls three washes with it . fabulous and abundant harvests to all of you” -PEAKYPLANTERS

4. What to expect?

The long 9 weeks have ended and once you’ve finished the drying, trimming, and curing process, your buds will be ready to consume, finally!

We had the grow reports come in and you’re in for a treat with this one, you can expect a complex and strong aroma that consists mainly of the following terpenes.

As you can see in the chart, this strain contains terpenes that can bring benefits to everyone, especially medicinal consumers which can be used for therapeutic benefits, remember that cannabis will not cure your illness but can be of great aid to treat chronic pain, migraines and other types of illnesses.

This mix results in a true expression of the classic strain and provides consumers a pungent mix of earthy, piney, and citrusy aromas that will make new growers fall in love with and will take old-schoolers back to the old days.

This terpene blend provides an almost 100% Indica type of effect with a slight and pleasant head high that will leave you deeply relaxed while staying motivated and happy.

Growers didn’t report any negative effects other than laziness, dry eyes, and mouth which Indica lovers should already be used to and have no problem at all with it.

5. In conclusion

If you’re looking to grow classic strains, this Og Kush strain is a must. The world-famous OG Kush is a great strain for medicinal patients and everyone who prefers an Indica-like effect, now available in auto version, which will allow you to grow from start to finish faster than usual.

If you’ve tried this strain before and want to give fellow growers some tips to help them make the most out of their growing cycle, feel free to leave a comment in the comment section below!

Thailand one step closer to decriminalising marijuana

Thailand on Tuesday moved one step closer toward being the first Asian nation to decriminalise marijuana, after its health minister signed a measure officially dropping cannabis from a list of controlled drugs.

The delisting will mean all parts of cannabis, including flowers and seeds, are allowed to be used in Thailand. However, extracted content will remain illegal if it contains more than 0.2 per cent of the psychoactive ingredient — tetrahydrocannabinol, or THC — that produces a “high.”

At a signing ceremony, Public Health Minister Anutin Charnvirakul said he hoped to set out a “new history for cannabis” in Thailand and remove the stigma around it.

“Cannabis actually has plenty of medical benefits, not different from other herbs, and we are trying our best to make the Thai people enjoy both medical and economic benefits from it,” Anutin said Tuesday.

Production, sale and possession of cannabis will remain partially regulated, however, meaning recreational use of marijuana is not yet legal. The ministry’s stated policy is to promote the use of cannabis for medicinal purposes and build an industry around derived products.

Thailand in 2020 became the first Asian nation to allow the production and use of cannabis for medicinal purposes, under tight controls. Anutin’s Bhumjai Thai Party, a major partner in the current coalition government, campaigned in the previous year’s election for the legalisation of cannabis production to aid farmers.

The delisting will take effect 120 days after its publication in the government gazette. In the period ahead of it becoming effective, the ministry will seek to have a bill on cannabis, approved by Parliament to clarify several legal points.

The proposed Cannabis Act would allow only patients whose diseases can be eased with marijuana, such as cancer and depression, to grow the plants at home, said Tonnam Niyamapar, a member of The Alliance of Citizens’ Cannabis Association, a lobbying group.

He said that the act would also allow people to smoke marijuana for medicinal purposes. Flowers of the plant had been on the list of controlled drugs, so until now, cannabis oil had been permitted only for treatments.

The ministry’s list of controlled drugs regulates a number of substances — from heroin, which is banned, to prescription and over-the-counter medicine.

Tonnam questioned why Thailand cannot legalise cannabis for recreational use, in the same legally-controlled manner it does with cigarettes and alcoholic beverages.

“I hope Thailand will finally liberalise cannabis for both medical and recreational use like the United States or Canada,” he said. “But I understand that it will take more years to make that happen.”