Best Flowering Stage Tips For Cannabis

The flowering stage is the moment we all have been waiting for. For you, as a professional grower, this is the most important part of growing marijuana. Let’s discuss how you can take care of your flowering cannabis and grow the best yield ever.

When your plants switch from the vegetation to the flowering stage, the growth will eventually get slower. When the plants start to develop flowers (so called buds), it is time to treat them differently. This means changes in light and different nutrients for the flowering stage.

While plants have been growing and prospering like crazy in the vegging stage, your plants will now be more prone to problems. Everything that happens from here on out will affect your yield – for better or for worse.

The entire flowering stage will be about 8 weeks and consists of the following stages: transition, first buds, growth of buds, buds ripen and harvest.

The entire flowering stage will be about 8 weeks and consists of the following stages: transition, first buds, growth of buds, buds ripen and harvest.

Different stages of flowering cannabis

Stage 1: Entering The Cannabis Flowering Stage

To introduce your plants to this new stage in their life cycle, make sure you are using the right flowering grow lights. Gradually change the light cycles until you reach a 12/12 hours ratio of light and darkness. Again, growing indoor gives you the perfect opportunity to create an environment that suits your plants best. It's important to take advantage of indoor growing instead of being dependent on the rhythm of the sun. The better your cannabis flowering stages are, the better your yield will be. 

The first 1 to 3 weeks of the flowering stage are a transition phase and your plants will still be growing. Your plants could double their height at this point depending on the type of strain you are using.

Stage 2: Spotting Your First Flowers

Before spotting a marijuana flower, you will still want to support your plants in the growth stage as much as possible. Once the flowers are showing, you want to optimize for light and nutrients. Now you can, and should, switch to nutrients for the flowering stage.

Remember: Only female plants will produce buds. You can make sure to have female plants by using feminized seeds.

In week 3 or 4, the first real buds will show instead of only hairy pistils. The growth of the plant will now slow down a lot - it's important to watch out for the health of your plants at this point. A few dead leaves are normal (ex: if they do not get enough light). You do not want a major disease at this point so it's also important to watch your nutrient levels and observe your plants closely to ensure nothing strange is happening.

Stage 3: Glorious, Beautiful Cannabis Bud Pistillation

Finally! Buds with substance. White pistils will be sticking in all directions and the buds themselves will be bigger every day. Congratulations! You have come a long way and your plants are rewarding you. Here's the best tips to follow during the flowering phase to get you here:

Best Flowering Stage Tips for Cannabis

Pro Tip 1: Only cut leaves and branches that are dead

It might be tempting to cut big branches, but your plants need all their power and health they can get right now. Never taste the freshly developed flowers - let them grow in peace. You might bend the plants and tie them down to create a more horizontal table-like shape instead of a Christmas tree shape.

Pro Tip 2: Keep humidity around 45%

When it comes to managing humidity during the flowering stage, keep your grow room between 45% humidity. While cannabis plants do love moisture, especially in the cloning and vegging stages, in the flowering stage you run the risk of powdery mildew on your buds with humidity anywhere about 50%.

Be sure to get a good thermo-hygrometer, measure your grow room daily, and employ the use of a dehumidifier if you see your humidity start to creep up into a dangerous range. A standard 30-pint dehumidifier like this one will work for most setups from small grow tents up to a 500 square foot grow room. For bigger grow rooms (1000 square feet+), consider stepping up to a 70-pint dehumidifier like this one.

Pro Tip 3: Use a carbon-filtered airflow system

If it hasn't happened yet, your plants now might develop the known marijuana smell. Make sure to use a carbon-filtered airflow system. Your airflow system is important at this point and fresh air needs to be constantly flowing into your grow room. In this phase, your plants will need a lot of CO2 (carbon dioxide) for growth and health.

In weeks 4 to 6 of your cannabis flowering, the buds will get bigger and fatter. Once the flowers are showing as small white pistils (white wispy hairs), your plants will need more phosphor and potassium. Both are important for a good bud formation. The nutrients support flowering and fruiting.

Pro Tip 4: Avoid Nutrient Burn

Nutrient burn could be a source of declining health of your plant. Make sure not to over-feed your plant with nutrients. You will notice that the tips of the leaves will seem burned if you over-feed your plants.

Pro Tip 5: Support Heavy Buds to Maintain Light Exposure

You do not have to think about tying your plant down at this point anymore. However, you might consider holding your buds up and close to the light if they are too heavy for your plant.

Pro Tip 6: Trim Excess Foliation

Some pros trim their plant leaves at this point (defoliation) so their plants can focus mainly on bud growth. Make sure to leave enough leaves to support your plant’s health! The leaves are fueling the plant’s system and therefore bud growth.

Around weeks 6 to 8, your plant will have stopped vegetative growth completely and only work on the buds. A few leaves might turn brown at the bottom now and this is perfectly normal. Your plants will be sensitive to a lack of nutrients at this point. Watch your pH levels to make sure your plants get all they need.

Pro Tip 7: Avoid Light Burn

Even though your plants love your powerful grow lights, make sure they do not get burned by high levels of light and heat. If you're using a grow tent, be sure it has enough height for the lights to be at least 12-36 inches above the top of your plants' canopy. If you're using higher wattage lamps (1000W or similar), you should be at the top end of that range, and for lower wattage lamps (250W or similar) you can be at the low end of that range, but make sure you always have at least 12 inches.

A final, supremely important thing to note about lighting during the flowering stage: once you start switching to the flowering light cycles – never go back. Never expose your plants to light in the dark phase of the day. You do not want to confuse your plants or make them switch back to the vegetation phase. This could dramatically impact your yield. It is the un-interrupted darkness that leads your plants to flower. Make sure this darkness is definite - not one minute of light in the night! Use a programmable timer to make sure you don't forget when you need to turn your lights on or off, and be sure to test your settings and confirm they're correct before trusting it on your precious cannabis plants.

Hardly any flowering cannabis will be ready for harvesting before week 8. You will be watching your plants closely at this point, treat them like a lady! Cater to all their needs. It also may be helpful to consider flushing them out using plain water for a few days before harvest. Between week 8 and 10, they should be ready for harvest depending on the strains. The intensity of the marijuana smell could be a good indicator. Your plants might start turning yellow at this point, which is what the plants normally do when they finish up the flowering stage. Do not raise your nutrient levels at this point. Your buds should be big and fat at this point... which means...

You made it! Enjoy your harvest!

Cannabis Flowering Week by Week Pictures

Week 1

cannabis flowering week 1

Week 2

cannabis flowering week 2

Week 3

cannabis flowering week 3

Week 4

cannabis flowering week 4

Week 5

cannabis flowering week 5

Weeks 6 to 8

cannabis flowering week 6 to 8


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  • Blue Moon – I’m interested in that crazy strain your talking about but you didn’t leave your email! Mines is alaskancash@gmail.com please contact me so we can talk details about that strain.

    Orion Seal
  • I wish to plant the marijuana in the traditional farming method of open field. what technique is best for me. Thanks

  • Email me if any folks out there are interested in a crazy strain took me 5 x too perfect it I don’t think I’ve had anything close to it no jive and the brother with the the weird nitro problem have u even tried any nitrogen fertilizers check out foxfarm it fine for for all the brothers and sisters I know around the country! !!

  • good information new and learning. Thank you look forward to more.

    christine R landis
  • Im not sure who writing this but fact check. Depending on the strain your asking for trouble at 70% RH is going to cause problems with possible bud rot and the higher humidity promotes powdery mildew and if you’re getting into flowering you don’t want to be using a sulfur burner to fix it for obvious reason never go above stay between 30% to 50% depending on genetics, If your plants are an indica dominant strain they will grow shorter and be in a cooler temp. Another issue: I understand your affiliate marketing for feminized seeds I get that but there are more hermaphrodites in Fem seed stock then in some standard I have come across. Hermaphrodite identification is essential. cheers

    Rob ouellette
  • Right I need some help I’m new to growing so decided to buy the Quick one cannabis seed, she is 8 weeks old and a staggering 100 cm, with loads of white hairs all over her, and she is under a 300 watt lamp is that normal for her to grow 100 cm? when it said she wont grow any taller than 50 – 60 cm, I also started her off on a 12/12 so I missed out the veg stage… could someone tell me that she wont grow any taller. and how long until I get some nugs? Thanx peace

  • Nice article. Thanks for the detailed info. To complement my growing, I also buy from https://getkush.ca/ and the quality is great.

  • Light intensity up thru 5th week of flower will give you the biggest buds
    …I run 1k and even set the ballast on super lumens…the LOVE to be pounded with a lot of light then….THEN, I tone the light intensity down for the last 2 weeks of flower…75% then down to 50% for the last 5 days…High intesity this late in flower can actually evaporate trichs….Anyone with a few yrs of growing under their belt has noticed how FROSTY your buds are just under the top canopy plane where the light was less intense, AND may have noticed the crystals on the very top most areas ARE NOT as frosty….They like to be blasted with light to get mass, but LOVE a moderate intensity for best trich ripening their last 10 days to 2 weeks…sept 2019 marks 40 yrs of hydro growing experience for me, so I have observed this for a LONG TIME…YT

  • Good to know to avoid nutrient burn but what are the best nutrients for flowering stage? Thanks

  • IMO the weed flower is the most beautiful flower on earth. I’d love to see a cannabis flowering week by week pictures if you guys could update this guide :)


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