week 3 autoflower seeds

How Long Do Autoflowers Take From Seed To Harvest?

Autoflowering cultivars changed the way that Cannabis could be grown indoors or outdoors, without being dependent on specific light cycles. From seed until the point of harvest, autos will begin to flower despite the various seasons during the year, making these low maintenance and highly resistant plants a grower’s best friend. In this article we explain what to consider when growing autos, the benefits associated, the life cycle broken down week by week including our grow tips.

1. The Life Cycle Of Autos

The following guide is based on an autoflowering cultivar that takes 10 weeks from seed until harvest.

Week 1

During the earliest stages of growth, the seedling will only grow as tall as one inch, producing its first set of leaves. By this time, the tap root of the seedling will grow downwards anchoring itself to the base of the pot. If grown in soil, seedlings can be fed plain water or a mild nutrient solution root booster.

• Grow Tip: The first week is a very delicate time and seedlings should be given extra care and attention, especially if planting directly outside in a hot or cold climate.

Week 2

After 7 days the seedlings will begin to grow taller increasing the size of the fan leaves. During this time the plants are in a vegetative state so they will rely on Nitrogen, Phosphorus, and Potassium as well as trace elements to aid in foliar development, stem production and root production.

• Grow Tip: Organic soil will have all of the primary nutrients and trace elements a Cannabis plant requires during the early stages. Bottled nutrients will also work well as long as you follow the recommended guide.

Week 3

By week 3, the plants will have grown tall quickly, with shoots between the internodes, that will develop into hardwood branches. The fan leaves will be large-sized and depending on which autoflowering cultivar you are growing, the growth structure will be bushy or one main central cola.

• Grow Tip: Now is a good time to perform plant training techniques such as tying down, super-cropping, pruning, and in some cases topping and fimming.

Week 4

Once autoflowering plants are 28 days old, they will have grown to a height between 30-45cm in some cases. The growth structure will be well established with internodal spacing stretching out more as the weeks go by. It is during this time when the plants will go through a hormonal change inducing flowering.

It is best now to reduce the amount of Nitrogen you are giving the plants, as their primary focus will be Phosphorus and Potassium. It is the P and K that encourage the plants to grow pre-flowers and strong stems and side branches in preparation for a heavy harvest. Sativa dominant hybrids should be tied down here if the height is an issue.

• Grow Tip: It is a great idea to add support such as bamboo stakes or a net trellis around the plants. Over the next 5-6 weeks they will focus on producing as much weight as possible.

Week 5

Now you are halfway through your growth cycle and will notice the growth structure and appearance of the plant will be growing tall, bushy, and with high resistance to strong winds.

Pre-flowers will be growing in abundance with resin production forming around the pistils, calyxes, and surrounding leaves. Depending on the cultivar you are growing, your plants will be as tall as 60-80cm, with new, fresh foliage being grown at every internodal site.

• Grow Tip: On the basis, you have trained your plants or used a screen, plant height can be easily controlled.

Week 6

By day 42, the plants will begin to fill out and take on a stacked and chunky appearance. The internodal spacing will become filled with flower sites, and the height of the plants will begin to slow down, as all energy is spent on flower production. The resin will begin to form very quickly covering the buds, with the aroma and terpenes making themselves well known. Plant height will range between 70-125cm

• Grow Tip: Now the plants will depend on frequent amounts of nutrient solution, and using supplementary boosters and enzymes is an option to increase flower and resin production further.

Week 7

Once your autoflowering plants approach day 49, the structure will be very dense and compact, with buds swelling at every internode. The aroma will also become much more enhanced and when you squeeze a bud, your fingers will be stuck together with a layer of sticky resin. The total height of your plants now is 70-150cm depending on cultivar and climate.

• Grow Tip: Some cultivars are more nutrient hungry than others, so do not overfeed your plants just because you are close to the harvest. Check how the plants look and respond between waterings.

Week 8

The buds will begin to fatten up and show signs of swelling up, with a prolific resin production. During weeks 8 is when the plants will be fed their last nutrient solution, as they will now be responsible for using up their reserve nutrients that have been stored over the duration of the plant’s life cycle. The plant’s appearance will look chunky, heavy, and full of weight with tightly packed sugar leaves surrounding the buds.

• Grow Tip: The white hairs on the plant will begin to fade to brown showing she is close to maturity. Do not judge the harvest date on the color of hairs, and use methods such as trichome development, bud density, and terpenes as a guide.

Week 9

As the plants get closer to the harvest date of 10 weeks, it is wise to encourage the plants to use up their nutrient reserve. The final two weeks are known as the flushing period, meaning that the plants will use up their reserve amounts of N-P-K and trace elements. It is normal to see deficiencies begin to form as this is a good sign the excess nutrients are being used up. The calyx of the bud will now bulge and swell with a round and pointy appearance. Trichome development will be at the peak maximum and now is a good time to start checking the maturity of your trichomes.

• Grow Tip: There is no need to add more water than normal, or water more frequently, simply stick to the routine you have been using .

Week 10

Once you have hit the 10-week mark, your autoflowering plants will be fully mature and ready to harvest. The buds will be as thick as golf balls and should have filled every branch and internodal spacing. The terpenes will be the most aromatic, they can be, with the buds encrusted with trichomes, including the surrounding leaves. At this point, you are ready to get your trimming scissors out and begin harvesting the plants.

• Grow Tip: By this point, the plants will display lots of different colors from deficiencies to end of seasonal colors, such as purples, pinks, and magentas.

2. The Advantages of Growing Autos

If you are new to growing autoflowering Cannabis, then you may not be aware of all of the advantages associated. In comparison to photoperiod strains that require 18/6, and 12/12, autoflowering cultivars are the opposite and will flower with any light cycle making them extremely versatile to all climates.

Here at Fast Buds we pride ourselves on producing the fastest flowering autos on the market. Our strains will range between 9-10 weeks, which is extremely quick making them perfect for commercial growers, including novice to expert.

3. In Conclusion

Thanks to the toughness and high resistance to powdery mildew, mold, hot and cold climates, autoflowering Cannabis plants are the best way to grow top-shelf flowers from beginner growers to expert commercial farmers.

Autoflowering cultivars changed the way that Cannabis could be grown indoors or outdoors, without being dependent on specific light cycles. From seed until the

The Lifecycle of the Autoflowering Cannabis Plant

Growing cannabis is an art that requires patience. Only growers that understand the science and lifecycle of the plant will succeed. The rest either fail miserably or simply give up. It’s not uncommon for beginners to fail. And since practice makes man perfect, keep at it until you finally harvest a big bunch of nugs that remind you of all the hard work.

I promise that it’s all worth it at the end. But first, you must understand how the plant grows. Not only will this help you save time, but you’ll also be able to bounce back even if you face setbacks. So, let’s take a look at the lifecycle of the autoflowering cannabis plant to make it a little easier for you.


The first step of the plant’s cycle starts with germination. Now that you’ve grabbed your favorite seeds, it’s time to plant them. People use different ways to germinate the seeds, but it’s important to stick to a method that works for you.

Ideally, the seeds should be soaked in a glass of water for at least 24 hours. Some growers use a nail file to scratch the seeds gently before soaking them. This ensures that the seeds soak in more water, but you shouldn’t attempt this if you’re a beginner.

The seeds can then be transferred to a wet paper towel and stored in a zip-lock plastic bag. Within 1-2 days, the tap root emerges and the seeds are ready to be planted. Note that many growers simply stick their seeds in the soil, and you can follow the same route if you prefer.

Seedling Stage

The seeds can be transferred to the soil at this point. It may take another day or two for the seeds to emerge from the soil and break their hull. Be patient and stop messing with the plants. You might be tempted to assist the seedling since it looks so fragile, but it will do fine without you. Also, remember to regulate the pH as it’s very important.

The seedling stage is the most important stage. The plant will take a long time to recover if there’s a mishap at this stage, so be very careful. If growing indoors, hang the lights at least 17-20 inches above the seedling. Reduce the distance as the plant grows bigger. CFLs, LEDs, MH and HIDs will do as long as the seedlings are comfortable.

Week 1 to Week 3

The seedlings begin with only two true leaves. After a couple of days, a third leaf will appear. The plants don’t need any nutrients on the very first week if you’re growing in soil. For those growing in hydroponic setups, reduce the strength of the nutrients by half to allow the seedlings to adjust to them.

You can kill the plants faster by overwatering them. Not a myth; it’s a fact. So, go easy on watering. And, make sure that you supply enough water to keep the soil moist. Moist, not dripping wet or dry. As the process of photosynthesis goes on, new sets of leaves will appear.

The seedlings become a little stronger during week 2. You can now introduce nutrients unless you’re using premade organic potting soil. Again, the nutes should be mild as the plants are still fragile. The distance between the lights and the seedlings should be reduced if the seedlings grow lanky.

By week 3, the seedlings show more leaves popping up. Most autoflowers display their sex at this stage, but if you’ve planted only feminized seeds, you don’t need to worry at all. If using regular seeds, however, it’s important to distinguish between male and female plants.

While female plants show their pistils, the males will produce little balls of pollen. It’s a good idea to remove the males since sensimilla buds are preferred. Nutrients can be used at regular strength now, but be cautious to check the plants for any nutrient burn. The seedlings will suffer a bit with low doses of fertilizer or nutrients, but they don’t recover quickly from an overdose or nutrient burn.

Week 4 to Week 6

This is the pHase that determines how big the plants grow. You can use several training techniques including LST, Topping and FIMing to increase yields. Many growers make the mistake of introducing bloom nutrients as soon as the plant produces a few pistils, but that’s not how you do it. Just because the plant displays the sex doesn’t mean that the flowering period has started.

Note that the plant is still in the vegetative stage and nutrients must be provided at full strength. Also, this depends on the type of fertilizer you’re using. For instance, if you’re growing organically, use organic nutrients according to the manufacturer’s instructions, but make sure that it contains more nitrogen.

If you’re using a brand that has two parts of Growth and Bloom fertilizers, use only the “Grow” part during week 4. Most brands of fertilizers provide the numbering of N-P-K to make it easy for you. For example, if you’re using Floraseries from General Hydroponics, only FloraGro and FloraMicro (micronutrients) should be used during this stage.

Here’s a quick video to understand the lifecycle of autoflowering cannabis plants:

Remember to regulate the pH constantly when using nutrients, but if you’re using something like the pH Perfect from Advanced nutrients, for instance, pH can take a back seat.

Week 5 begins with the plants producing lush leaves with a few buds appearing slowly. Continue with the “Grow” nutrients even at this stage lest you want the plants to stop growing vertically. This is the stage where an explosion of growth occurs and you need to support it with nitrogen. Using more phosphorous or potassium at this point will force the plant to focus more on the buds rather than growing.

Many growers use bloom nutrients as soon as they enter the 5th week because they are satisfied with the growth of the plants. Some plants like Green Crack and Gorilla Glue have the tendency to grow very large, so you might be tempted to use flowering or bloom nutes. However, the yields can reduce significantly if the plant isn’t allowed to grow to its full potential.

As you enter week 6, the appearance of buds is even more apparent. A little defoliation doesn’t hurt now. Defoliation is the process of removing extra leaves to provide more light to the lower parts of the plant. Don’t overdo it, though, because the plant relies on the leaves to receive nutrients. Continue with nutrients meant for the vegetative stage as the plant will shoot up vertically.

Week 7 to Week 9

The plant is all geared up for its flowering stage and bloom nutrients can be used at full strength. The buds will begin to swell and the unmistakable aroma of sweet cannabis will fill up your tent. The pistils will slowly change colors from white to a light brown or red, depending on the strain.

It’s also a good idea to use nutrients to boost buds to improve the quality. Organic soil growers can use dried and powdered banana peels to introduce more potassium to the soil. The vertical growth stops sometime during week 7 but the plant does everything in its power to increase the size of the buds.

As you enter week 8, the leaves start yellowing a bit, but there’s nothing to be alarmed. This is just a natural way of the plant indicating that it’s nearing the end of its cycle. Continue to use flowering nutrients even as you step into week 9. Don’t forget micronutrients that are added right from week 2. Defoliate the plants again if the bottom parts of the plants display small buds.

Week 10 to Week 11

The plant is almost at the end of its lifecycle. Stop using nutrients and use plain water to remove any chemical buildup. This practice is known as flushing, and it’s very important if inorganic nutrients are used. Flushing also ensures that your buds don’t taste or smell like chemicals and improves the quality of smoke dramatically.

By week 11, all the leaves start turning yellow. Most of the pistils turn amber, indicating that it’s almost time to harvest. Admittedly, many seed companies including Fastbuds tell you that the plant will finish its cycle in 8-9 weeks. And yes, they do finish in 9 weeks if you use bloom nutrients right from week 4.

The plants head into the flowering stage pretty quickly and the result is a faster harvest. However, if you want your plants to grow a little bigger, start using bloom nutes only from week 6 and you’ll see the difference in yields.

Growing cannabis is an art that requires patience. Only growers that understand the science and lifecycle of the plant will succeed. The rest either fail misera