Week 3 of Flower | Week-by-Week Guide to Flowering Cannabis (2024)

We are now in Week 3 of the flowering stage. Here are the new developments we will dive into:

  • Emergence of pre-flower bud sites
  • More growth and stretching
  • Continuous use of the trellis to train the plant

In this episode of A Week-by-Week Guide to Flowering Cannabis, our Harvest Manager Justin walks us through these observations during the third week of the flowering period.

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Changes in your plants from Week 2 to Week 3 of Flowering

The biggest change from Week 2 to Week 3 is the emergence of small pre-flower sites. These are the places where your flower buds will bloom. And this should get you excited!

After growing through the stages of planting seeds and vegging your plants, you have been growing for quite some time now with no visual representation of bud. Now you have it! Now you can see that this plant will eventually produce large flowers. Because you are only three weeks into the 12/12 light cycle and you are now beginning to see little mini flower sites.

Now that you know you are on the right track, let’s continue on with the other changes and developments that take place during Week 3 of the flowering stage.

More growth and stretching of the plants in Week 3

In our video, we are just a few days into the third week of flowering. You will notice continued growth and stretching.

You can see in the video how bushy everything has become. This rapid, almost non-stop growth is all a sign of the post-vegetative stretch that these plants go through after switching to the 12/12 light cycle.

All of this growth is an indication that you are on the right track. Your plants are responding well to the reduced amount of daily light. They are recovering and rebounding as a result of the increased dark cycle.

But be ready for the bush!

As you can see in the video, they are much more bushier than they were in Week 2. This additional thickness is part of the post-veg stretch. Your plants will not only grow taller, but the sheer amount of plant material will increase as well.

There are two things that need to be done at this point:

  1. continuous use of the trellis
  2. Defoliation of plant material

Continue to Use the Trellis to control the plant

In order to tame and control the plant, you must continue to weave the branches under and through the trellis netting. It is as this stage that proper use of the trellis is critically important.

At this stage, your plant is still pliable and capable of bending and stretching. You must take advantage of the plant’s ability to be trained. It will not last forever. In fact, by next week, you won’t be able to do this. So get after it!

By weaving your plants through the trellis, you will actually spread the plant wide, which will create more square footage of canopy. More square footage of canopy means you will soak up every bit of light you can and use it for the plant.

If you allow you plant to grow tall and skinny, you are wasting light rays, as only a few branches will absorb the light. By laying the plant over, you can capture much more light, and therefore generate many more bud sites and colas.

In short, Week 3 of Flower is your last chance to really train the plant for greater yield at the end of flower. You must take advantage of this opportunity before it’s too late.

Defoliate your plants to remove excess foliage

At this time, if you have not already, you should perform a heavy defoliation. We usually perform a heavy defoliation at the end of Week 2 or start of Week 3. During this time, there is an almost continuous growth that seemingly doesn’t stop for weeks. Do not let this overgrowth get out of hand, or you can fall behind schedule.

When plants get too bushy, they become harder to train. You also do not know where the money spots are, as the entire plant is engulfed in fan leaves.

A good rule is to basically remove every fan leaf on the plant at this point. Don’t worry, more will grow back. But you need to be able to see through the plant and see where the bud sites and future colas will grow.

You also need to be able to weave the branches through the trellis, and excess foliage can obstruct that effort. So remove the foliage, stretch the plant wide and lay down those branches. Pop them up through the trellis squares far from where they started, and watch new bud sites emerge from your newly cleaned branches.

This series continues next week…

Stay tuned for next week, we will dive into Week 4 as we watch these cannabis plants continue to progress through the flowering stage.

Week 3 of Flower | Week-by-Week Guide to Flowering Cannabis (2024)

FAQs

What to expect in week 3 of flowering? ›

Week 3. Your cannabis plants have still not entirely stopped growing and will now be about 50% bigger than what they were just three weeks earlier. Although still stretching a bit, the stretch will now gradually slow down and soon come to a complete halt.

What does week 3 of cannabis flower look like? ›

At this stage your cannabis plants wont have completely stopped growing and your plants could be up to 50% bigger than they were prior to flipping the lights. New stems and leaves become more apparent in week three of flowering and more pistils can be seen emerging from the leaf bunches atop the main colas.

What nutrients are needed in Week 3 of flowering? ›

In theory and as we have seen before, during weeks 3 and 4 of the cannabis flowering phase, the plants stop growing and begin to flower massively, so they no longer need as much nitrogen, but they begin to consume more potassium and above all phosphorus, which at this stage is surely the most important nutrient and ...

What should week 4 of flowers look like? ›

At week 4 of the flowering stage, your cannabis plants will likely have stopped growing altogether and are now spending all their energy on growing buds. There will still be white hairs sticking out from the buds, but the buds themselves will become bigger and fatter with each day.

When should I start removing fan leaves during flowering? ›

Early to Mid-Flowering Stage: It is generally recommended to start removing fan leaves during the early to mid-flowering stage when the plants have established enough bud sites. At this point, the plant has sufficient resources to support the remaining leaves and direct energy towards bud development.

What week do buds swell the most? ›

During Weeks 3 through 6, your buds will grow the most. You will see buds really develop in size between Week 4 and Week 5. By Week 6, your buds will look totally different in size from just two weeks prior. The room will also be very fragrant.

What are the signs of early flowering cannabis? ›

Appearance of White Hairs (Pistils)

These white hairs are one of the most visible signs of the flowering stage. As the plant progresses further into flowering, the pistils may change color, typically transitioning to shades of yellow, orange, or brown.

What week of flowering do buds smell? ›

That typical cannabis smell that all growers love comes from the production of trichomes. Trichomes contain cannabinoids and terpenes, and terpenes are responsible for the smell. With autoflowers this happens between 4-6 weeks, depending on growing conditions and strain genetics.

What do trichomes look like when ready to harvest? ›

When trichomes are cloudy and ready for harvest, you'll likely notice that 50-70% of the white “hairs” on your buds have turned amber. Keep in mind that if you wait too long and trichomes turn amber you will lose THC potency. The key thing to look for is milky, cloudy trichomes, as they contain the highest THC levels.

What nutrient is best for flowering? ›

In general, fertilizers formulated for flowering plants would contain amounts of nitrogen less than or equal to the amounts of phosphorus (i.e. 10-10-10 or 5-10-5). This is because phosphorus encourages flowering.

Can I defoliate in week 3 of a flower? ›

One Last Defoliation at Flowering Week 3 – Now that you're three weeks into the flowering stage, do another major removal of just about all the fan leaves. Make sure to especially take any big leaves with long stems, or leaves that are covering bud sites! Again, avoid removing or damaging any developing buds!

What is the most important nutrient for flowering plants? ›

Phosphorus or Phosphate (P): Promotes blooming and fruit formation. Potassium or Potash (K): Develops healthy root systems.

What should my buds look like at 5 weeks? ›

Well that concludes are look at Week 5. The plants have gotten deeper into flower, the buds are getting bigger, and the vegetative growth has slowed. Next week, we will get to see just how much the top colas have developed.

Can I defoliate in week 4 of flowers? ›

After the transition to the flowering stage, the team will prune the plants in week two and then hit defoliation in week four, he says.

What should week 2 of flowers look like? ›

Week two of flowering is usually when you can confidently “sex” your plants. Females will start growing long, white pistils at their nodes (bud sites). Males, on the other hand, will develop round pollen sacs.

What week do trichomes appear? ›

When Do Trichomes Start Appearing? Trichomes become more prominent during the third or fourth week of the flowering stage of your plants. It would be best to start inducing the nutrients your plants need to improve trichome production and effectiveness at this phase.

Do buds get bigger last 2 weeks? ›

In the last two weeks, the buds will mainly mature and grow no more in size. The white trichomes (small resin-secreting stalks/hairs) on the buds will now slowly turn brown.

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