Flowering Stage For Indoor Marijuana Plants

Page content

Flowering Stage For Indoor Marijuana Plants

Flowering Stage For Indoor Marijuana Plants

The flowering stage doesn’t correlate perfectly to the point when you induce flowering in your plants. Actually, cannabis plants will develop flower structures within the first couple weeks of this stage.

The internodes will decrease and the plant will continue to grow upwards (sometimes somewhat more slowly than it was growing before). However, there is a still a lot of growth to be completed in the beginning of the flowering phase of the cannabis life cycle. It’s important to keep this in mind when thinking about how to properly feed your plant!

When your plant begins to mature and develop flowers (yay,buds!) you have to treat it differently. We’ll help you through this exciting milestone with an analysis of how to handle the mature phase of your cannabis plant’s growth.

Flowering fertilizers

Flowering fertilizers cannabis indoor

Many new growers switch their nutrient ratios too early. It’s easy to to do, but remember your plant is still growing at the very beginning of the flowering phase. While it’s true that the plant will need more phosphor and potassium, it’s still growing for a few more weeks! So it still needs nitrogen.

If you stop giving the plant enough nitrogen at this crucial stage, it could develop a deficiency. Right when you’re nearing the finish line, the plant will begin to yellow and its health will decline. Don’t alter your nutrient solutions until the plant shows very clear signs of flowering. You should be able to see stamens and pistils clearly when you change over.

During the first two weeks of the flowering stage your cannabis plant gets taller and the spaces between the leaves (internodes) will begin to shorten. Shortly after this, you will begin to see the first pistils appearing. You’ll know the flowering phase has started in earnest when you see a lot of these.

Pruning buds

Pruning buds flowering stage cannabis plants

A little over a week after that, the marijuana plant will stabilize its growth patterns. You can prune away all the buds that are in shadows since they won’t be developing the compact flowers you’re looking for.

At this point, you want to maximize the light and nutrients that will be focused towards developing those precious buds. When you’re pruning, try not to cut off any of the leaves.

It can be tempting to cut off some of the large leaves which shadow the flowers. DON’T DO IT. Your plant needs those big strong leaves to absorb light and keep the flowers developing. Only cut off leaves if they are dead or otherwise compromised.

Temperature, humidity and nutrients

Temperature humidity flowering stage cannabis plants

When your plant reaches the flowering stage of growth, you’ll want to modify the environment accordingly. If you aren’t already using them, you’ll want to switch over to sodium vapor lamps: they emit the spectrum of light that is ideal for flowering cannabis.

You’ll be changing the day/night cycles of light exposure as well, shortening the amount of time that the plant receives light during. Many growers favor equal ratios of light and darkness in a 12:12 hour cycle throughout the day.

Once you start this process, make sure you don’t interrupt it! You don’t want to confuse your plant by letting it be exposed to any light during the dark periods of the cycle. Not even once. This sort of illumination interruption can easily cause the plant to change back to a growing cycle, and you could inhibit your potential yield.

You’ll want the air temperature to change between the light and dark cycles as well. When the plant is exposed to light, the temperature should be hovering near 68ºF and 77ºF (20ºC and 25ºC) near the foliage and 68ºF (18ºC) at the roots. Remember that higher temperatures will require accordingly higher levels of carbon dioxide. When your plant is in the dark, you can let the temperature drop down to about 68ºF (18 degrees Celsius).

Keep the humidity at a steady 70%. Keeping this stable will help you avoid any pest issues that could arise during the flowering phase. Now is also the time to switch over to a flowering nutrient solution. As stated above, just make sure you don’t switch over too early.

First flowers

First buds flowering stage cannabis

After several weeks of the 12:12 hour day/night cycle, the marijuana plant will stop growing and start flowering. The initial flowers will appear on the buds. At this point, the plant shouldn’t be producing any leaves at all, and you’ll see small white pistils developing rapidly and multiplying on the surface of the plant.

Some of the leaves will begin to be covered in a thin, transparent resin. This will happen most closest to the flowers. At this point, you can switch over to your flowering nutrient solution. Your plant requires higher levels of phosphor and potassium during this phase to keep up with the change in growth.

Sometimes new growers can be tempted by the buds and the resin being formed. Whatever, you do, don’t hack up your plant to try and ‘taste’ it. It’s still not fully developed, and you won’t learn anything, except possibly what a small yield you get when you cut apart your immature plant before it’s fully developed. The cannabis plant needs time to mature before you harvest.

Flower expansion

Expansion buds flowering stage cannabis

About a month after the flowering stage begins, you’ll begin to notice more changes that signify the beginning of plant maturity. The buds themselves will expand and distend: that’s normal. It’s good. Your plants will also grow outwards, widening and getting thicker. The number of calyces on your plant will keep rising. The transparent resin you noticed early will darken and develop a strong odor. If you’ve got a good plant, there will be lots of it.

Because of the expansion, the flowers will grow closer and closer together. At this point, the plant will be bearing a lot of weight and will almost certainly require some support. You can create a trellis system with string or wood, or you can use a metal spring system. The metal spring systems are nice because they will actually adjust the weight of the plant as it matures.

Once the marijuana plants have grown extremely closely together, you’ll likely want to lower the humidity a little bit to minimize the potential for mold, bacterial, or fungal development in those spots. It’s hard for air to circulate through the tiny gaps.

Fully mature flowers

When stop fertilizing cannabis indoor

Maturity is probably the most crucial phase of development in the cannabis life cycle. At this point, you’re just days away from being able to harvest and process the yield you’ve been working on over the previous months. The time you harvest will have a huge effect on the end product.

You’ll notice that the calyces and pistils start to turn red as the plant finishes maturing. The resin will continue to accumulate, getting stickier and heavier with every passing day. The flowers will draw together and close up any remaining space. This is the point at which your plants will develop a powerful odor. The best way to deal with the odor is the utilization of carbon filters. Just trying to mask it is unlikely to be effective, and will probably just complicate the problem.

When to stop fertilizing

Fully mature buds flowering cannabis stage

You’ll want to stop fertilizing your marijuana plants about two weeks before the flowering stage finishes. This will allow your irrigation and watering to rinse minerals and nutrients out of the plant, making it safe and enjoyable for use.

Rock wool, soil, and coconut fiber require two weeks, but if you’re using clay pellets, even a week of water rinsing will clean out the substrate. This cleaning process is very important if you want to get a quality product in the end; otherwise there will be a lot of unused minerals drifting around the plant’s insides.

When at least half of the pistils on your cannabis plant have turned red, you are ready to harvest. The resin should be thick, and easily visible to the naked eye. The plant should be very heavy with buds, and some of the leaves might be turning yellow.

As the leaves turn yellow, you can remove them from the plant. They turn yellow at the end because energy is being devoted to the flowering parts of the plant. Just make sure you don’t remove any green leaves— those are still producing valuable energy!

Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible

Robert

Download the Ultimate Grow Guide for FREE!
Learn the basics of growing marijuana and get started today
  • How to get the biggest yields from cannabis plants
  • What you need to get started, without wasting money
  • The most common mistakes you do not have to make
We guarantee 100% privacy.

Comment Section

18 thoughts on “Flowering Stage For Indoor Marijuana Plants


By terry208 on 16 May 2015 at 23:24

Everyone says that indoor plants must remain in total darkness during the dark phase, but outdoor plants are never in total darkness, can you explain the difference?


By bayou critter on 23 August 2015 at 03:40

whats up peeps well I get really good results from a giant flouresent good heavy bud but can someone tell me
if fox farm is a good fertilizer solution anyway let u all know seems like I was having betterresults with the earth juice so guys tell me wht ya think growing in dirt


By john callahan on 10 June 2015 at 12:28

are led lights good or bad?


By latewood on 15 June 2015 at 23:04

The question on LED is off topic here. It is a matter of choice. I use HID lamps. Please post lighting LED question in our support forum in order to get more efficient responses, from LED growers. :)


By latewood on 15 June 2015 at 23:09

Terry, I do not totaqlly agree that Outdoor plants are never in darkness; However, I have not got an answer for you; To be honest. If you are talking about the Moon; I cannot come up with a good theory, as of yet.
I will tell you though; If you do not grow your induced indoor plants in total darkness, you could develop hermaphroditic plants.


By PHIL420 on 17 June 2015 at 17:10

Thanks man for all of the correct input you’ve been more helpful then anyone else & the info is rt. on the money,Peace brother n be well Medicaided!


By latewood on 25 August 2015 at 16:53

bayou critter,
I have trouble understanding 1/2 of your post, but as far as nutrient lines. Use what you feel comfortable with. Happy growing.


By k capoferri on 27 August 2015 at 16:43

hi ILGM, i’ve been reading your articles on every aspect of growing your seeds. you say to stop using nitrogen near end of bloom stage. the manufacturer of my hydroponic grow box says the product sent with the grow box can be used from start to finish. the product “Moon Dust” is 19-8-13. i’m confused. can you please advise. this is my first grow. thanks. kc


By Muhafid on 27 August 2015 at 20:06

I am usually to runinng a blog and i really admire your content. The article has really peaks my interest. I’m going to bookmark your site and preserve checking for brand spanking new information.


By Redneckpotsmoker on 30 August 2015 at 08:08

I have a plant first time growing growning its on 55th day and about 3 foot tall ever since I sprouted it its been going outside at 8 in morning I bring it in at dark and it stays in my closet till next morning should I keep doing this or do I start shorting its light time now have pic can send of it to


By latewood on 2 September 2015 at 09:36

k capoferri,
When you see the phrase, “from start to finish”, this means that you can use this nutrient throughout the entire grow. This has nothing to do with the final “flush”; Or, what you read as stopping the application of nutrients. We stop applying nutrients the last 2 weeks of the grow period, in order to allow the plant to use up stored nutrients, resulting in better tasting Marijuana. :) Hope this helps you . Peace “)


By latewood on 2 September 2015 at 09:38

Thank you for the kind comments. We are glad you have found use for the information provided in this Blog. Feel free to join our support forum in order to find many informed growers that are always willing to help a brother out! :)


By latewood on 2 September 2015 at 09:42

Redneckpotsmoker,
This is really hard to answer. If you have been keeping it outside only for the daylight hours; You are already on a short photo period. The only reason to reduce the photo period, would be to induce flowering. This should happen naturally outside, due to the fact that days are getting shorter, and Autumn is approaching fast. :)

Leave a Reply

*