The Cannabis plant life cycle – Cannabis stages week by week

Content updated in August 2023

In this article, you will learn about the Cannabis plant life cycle, divided into stages week by week. You will find information about the plant’s growth at each stage, some of the plant’s basic needs, and what to watch out for! Learn how to grow weed from seed to harvest!

Table of contents

Cannabis growth is divided into seed germination, seedling, vegetative, and flowering stages. Each of these stages has its own environmental and nutritional needs, even different photoperiods. Learn all about the growth stages of the cannabis “weed” plant.

Storing your Cannabis seeds

This is how the life of a Cannabis plant begins. A viable seed looks brown with some stripes, is dry, and feels hard. If the seed feels weak or is white or light green, it’s probably an undeveloped seed that won’t produce a healthy plant.

Keep your cannabis seeds in a dark, cold place, for example, in the fridge inside a plastic bag for better conservation. When the time of germination comes, get your seed out at ambient temperature. You can better your germination chances by putting your seed no more than 12 hours in a glass of water; if it floats it’s probably not viable, although it may germinate anyway. If the seed sinks, it’s probably because it’s viable and full of life, ready for germination. Don’t let seeds in the water for much longer, as the seed needs to breathe oxygen and it may drown and die.

cannabis seeds sealed bag
Cannabis seeds PH: Ulrike Leone

Cannabis seed germination (lasts about 3 to 10 days)

For germinating, Cannabis seeds need warm temperatures, humidity, air, and water. Place your seeds in a dark, warm, and humid place, for example between two plates in a damped napkin.

When the seed opens up and shows the first white taproot, it’s time to place it in a small pot, in its next growing medium (soil, coco, etc.). This root begins to develop and eventually, the plant forms the first two oval leaves, called cotyledons. Now it’s a seedling!

Cannabis Seedling stage (lasts about 2 to 3 weeks)

Factors that lead to the healthy growth of Cannabis seedlings

  • Warm temperature, about 71.6 to 78.8°F (22° – 26º C )
  • Relative humidity: about 65 – 80%.
  • Low light intensity, blue spectrum preferred
  • Adequate light distance (hand test) depending on the light source
  • Light/Photoperiod: 18 hours of light / 6 hours of darkness
  • Nutrition: a low dosage of nutrients for the beginning then increasing
  • Small pot size: After germination, you should place your seed/seedling in a small pot or tray with drainage for better results
  • Watering: Water your seedlings with a sprayer to avoid overwatering
  • pH levels: between 5.5 and 6.5

This is how the seedling stage begins: when the seed opens, the first pair of small round leaves that appear, are called “cotyledons”. After that, the small Cannabis plant starts to produce serrated leaves, not the characteristic digitated leaves, only single serrated leaflets. As the seedling grows, new leaves develop with more leaflets until the plant produces digitated leaves with serrated borders we can all identify as Cannabis fan leaves. When these leaves appear, the plant enters into the vegetative stage. This process can take up to three weeks.

Cannabis seedling
Cannabis seedling with round leaves (cotyledons) and small serrated leaves. PH: rexmedlen
Cannabis seedling first leaves
Cannabis seedling first leaves. PH: Scotty Frey
Cannabis seedling first leaves. PH: Alicia M

Cannabis seedlings’ growing conditions

Cannabis seedlings like relatively humid conditions. Temperatures should remain warm and lighting should be placed near the plants and moved up as they grow. Finally, these baby plants require only small amounts of nutrients and their needs will increase as the plant gets larger and stronger.

Always check lighting and air circulation, keep watering to a minimum, and keep them in a small pot or tray for a few days rather than planting them in their final container. This will allow the root system to develop more easily and vigorously, and there is less risk of the small plant getting too much water and drowning. Make sure your seedlings get enough light, otherwise, they’ll grow very tall and weak, have few leaves, and have a stretched white stem.

Cannabis vegetative stage (Lasts about 3 to 16 weeks)

pics week by week

Factors that lead to healthy growth of Cannabis in the vegetative stage

  • Warm temperature, about 22 – 26º C (80.6 to 78.8°F)
  • Relative humidity: about 40-60%
  • Increased light intensity / blue spectrum 
  • Adequate light distance according to the light manufacturer’s instructions
  • Good airflow, exhaust system, and CO2 intake
  • Light/Photoperiod: 18 hours of light / 6 hours of uninterrupted darkness
  • Nutrition plan: Apply nutrients as needed – set a nutrient schedule and follow it    
  • Bigger pot size: After germination, place your seed/seedlings in a small pot, cup, or tray with drainage for better results. Transplant the plant as needed to avoid poor root development (rootbound)
  • Watering: Water your plant regularly, avoid overwatering, and make sure the pot has good drainage
  • pH levels: between 5.5 to 6.5
Cannabis vegetative stage - week 3
Cannabis vegetative stage – week 3 PH: Alicia M
Cannabis vegetative stage - week 4
Cannabis vegetative stage – week 4 PH: Alicia M
Cannabis vegetative stage - week 4
Cannabis vegetative stage – week 4 PH: Alicia M
Cannabis vegetative stage - week 5
Cannabis vegetative stage – week 5 PH: Alicia M

In the vegetative stage, a healthy Cannabis plant grows in height and size as much as it can under the given conditions. The plant now grows only leaves and stems. The plant may show solitary flowers, also called “preflowers”, which show sex (male or female). Inflorescences are groups of solitary flowers, also called “buds”. Buds will not begin to form until the days get shorter, in Autumn, or when the photoperiod is changed to 12/12 for most cultivars.

How long does the vegetative stage last?

Most growers let their indoor plants vegetate for 3-8 weeks, depending on the desired plant size. Cannabis plants are capable of flowering starting in the 3rd or 4th week of the vegetative stage (depending on the strain or cultivar), but these plants will probably be smaller. If you give your plants more time for the vegetative stage, the plants will grow bigger and are more likely to produce higher yields. Indoors, you will need to change the lighting timer to a 12/12 hour schedule to trigger the flowering phase (for most cultivars). In the 6th week after germination, some Cannabis plants are able to show their sex by growing solitary flowers or “preflowers”.

Male, female or hermie?

At this point, you should know (soon) if your plants are male, female, or hermaphrodite. If you are growing with the intention of harvesting Marijuana buds (not seeds), you should only grow female plants and kill the male and hermie plants ASAP. Male and hermaphrodite plants will soon start pollinating the female plants and you’ll end up with lots of seeds and very few buds. As said before, only female plants produce buds, male plants don’t and hermaphrodite buds are not so good. If you want to produce seeds or keep pollen, you can keep the male plants for that intent. Hermaphrodites are not desirable as their descendants will probably be hermaphrodites too.

Flowering stage (lasts about 8 to 11 weeks) – Pictures week by week

Factors that lead to the healthy growth of Flowering Cannabis plants

  • Warm temperature, about 64.4 to 78.8°F (18 – 26º C) 
  • Relative humidity: around 40-50%.
  • Higher light intensity, red spectrum preferred
  • Adequate light distance: hand test
  • Light/Photoperiod: 12 hours of light / 12 hours of darkness.
  • Nutrition: a higher dosage of flowering nutrients
  • Bigger pot size: Transplant to its final pot before starting the flowering stage
  • Watering: Water as needed
  • pH levels: between 5.5 and 6.5

Flowering stage indoors

To enter the flowering stage in indoor crops, the photoperiod must be changed to 12 hours of light / 12 hours of darkness schedule.

It’s extremely important NOT TO INTERRUPT the hours of darkness (lights off) so that the plant begins to bloom. If this dark period is interrupted, the plant gets “confused” and flowering may be delayed or worse, the plant may revegetate (go back to veg stage) or start producing hermaphrodite flowers. You definitely don’t want that to happen!

Flowering stage outdoors

Growing outdoors, plants will start the flowering stage when the days grow shorter, usually when Autumn is coming.

Autoflowering strains don’t need a photoperiod change to start flowering, their vegetative stage lasts around 4 weeks and then it changes stages automatically.

Cannabis plant during the flowering stage
Cannabis plant during the flowering stage PH: Alicia M

How long does the flowering stage last?

The duration of the flowering stage varies among different strains.
The flowering stage usually goes from 8 to 11 weeks, depending on the strain. It’s usually divided into weeks or three stages. The flowering period for “Indica” labeled strains is typically around 8 weeks, but it may take up to 10 weeks. “Sativa” labeled strains may take up to 10-12 weeks. Typically, hybrid strains will take up to 6-10 weeks to fully develop.

Flowering initiation – week 1-3 of the flowering stage

From weeks 1-3 of the flowering stage, plants stretch and grow in size and height. Plants stretch and double their size in this phase. The female Cannabis plant starts blooming by producing solitary flowers, also called “preflowers”, their pistil parts or “stigmas” sticking out look like “a pair of white hairs”.

Cannabis Flowering stage initiation
Cannabis Flowering stage initiation – week 2 PH: Alicia M
Cannabis Flowering stage initiation - week 2
Cannabis Flowering stage initiation – week 2 PH: Alicia M

Towards the end of the third week of flowering, the plant starts growing lots of solitary flowers and starts forming its bud sites in the plant nodes (where the main stem and the branches meet). Look for clusters of female solitary flowers or preflowers.

Cannabis plant early flowering stage
Cannabis plant forming bud sites – week 3 PH: Alicia M
Cannabis early flowering bud sites
Cannabis plant forming bud sites – week 3 PH: Alicia M

Mid-Flowering –  week 4-5 of the flowering stage

From weeks 4-5 of the flowering stage, plants stop growing in size and start growing, fattening their buds and darkening their pistils. It’s important to keep a good feeding schedule in order to fatten the buds and help the plant grow strong aromatic components.

Cannabis Mid-Flowering - week 4
Cannabis Mid-Flowering – week 4 PH: Alicia M
Cannabis Mid-Flowering - week 4
Cannabis Mid-Flowering – week 4 PH: Alicia M
Cannabis mid-flowering outdoors
Cannabis mid-flowering outdoors PH: Alicia M

Late flowering / Ripening – week 6 to harvest

In the last few weeks, buds gain the most weight and flowers produce the highest amounts of cannabinoids, such as THC and CBD among others. Flowers are sticky to the touch and can be very smelly. You are very close to reaching your goal of harvesting.

In this stage of the Cannabis plant, pistils or stigmas may show white, cream, and brown colors. They also start curling inwards and buds get covered in trichomes. Similarly, trichomes also change colors and you should pay close attention to these changes because they are one of the best clues for knowing when is the best time for harvesting.

Cannabis late flowering - week 7
Cannabis late flowering – week 7 PH: Alicia M
Cannabis late flowering - week 8
Cannabis late flowering – week 8 PH: Alicia M

Remember you may need to do flushing prior to harvesting, so calculate your times in advance! 

Flush for better results!

Flushing a Cannabis plant is basically running a lot of water through its growing medium (soil, for example) to get rid of the excess salt and mineral nutrients. It is recommended when there is an excess in fertilization.

Flushing involves watering your plants with only water, no nutrients added to “flush” all the salt excess from the roots. It may be done one or two weeks before harvesting (in soil) and in one day, two, or more, depending on your feeding schedule and crop size. During this period between flushing and harvesting, plants use most of the nutrients they’ve been building up and the result is said to be a much tastier and aromatic weed. If there is excess fertilization and you don’t flush, those buds may have a bad and strong flavor and smell and may feel harsh on your throat when smoked.

Even though lots of fertilizer companies recommend flushing plants for two weeks before harvesting, many growers nowadays choose to avoid flushing altogether and still have good results. It’s a matter of personal choice and one must evaluate the growing conditions, the nutrient schedule, and the final results. For organic growing without excess fertilization, flushing is not necessary. Bear in mind that the plant produces most of its cannabinoids in the last two weeks of flowering and flowers grow in size in that time as well. Flushing in excess or too early in flowering may lead to smaller and less potent cannabis buds.

Set reminders with the Grow with Jane app to start monitoring trichomes and pistil changes around weeks 6-7 with a hand lens, magnifying glass, or loupe to determine the best moment for harvesting. 

Cannabis bud harvested loupe trichomes
Cannabis bud had lens trichomes PH: Lea

For more information and growing tips on the Flowering stage of Cannabis plants, read our full article.

When to harvest a Cannabis plant (Week 8+)

Around week 8 of the flowering stage, buds will start fattening quickly. You will see that trichomes and pistils or stigmas are maturing and changing colors. Usually, when trichomes turn from transparent to a milky/whiteish color (and maybe 5-10% of them turn amber), your plant is ready for harvesting. It’s up to each grower at the harvesting moment, depending on the effects and flavors desired. Some cultivars may take 12 weeks or even more to complete the flowering stage.

Cannabis bud harvested trichomes
Cannabis bud harvested trichomes PH: Alicia M
Cannabis branches buds harvesting
Cannabis branches buds harvesting PH: Alicia M
Cannabis branches buds hanging drying
Cannabis branches buds hanging drying PH: Alicia M

We hope this guide helps you understand the Cannabis plant’s stages and life cycle. Now you know how much time each stage takes and what to expect.

Read the following article to learn how and when to harvest

Read the following article to learn exactly when to harvest your flowering plants, how to tell if they are ready by looking at trichomes and pistils, how to dry and cure your buds, and more! All are explained in a simple way, with pics and a Step-by-step harvesting guide.

Remember to download and try our Cannabis growing journal app, Grow with Jane! You’ll find lots of tools for planning and tracking your Cannabis crop through its stages, calculators, reminders, photos, and much more coming soon! And it’s free!!

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73 thoughts on “The Cannabis plant life cycle – Cannabis stages week by week”

    • Hello Butch! To Harvest a tree or trees in the Grow with Jane app, go to your tree view, then to the menu in the “More” icon and mark your tree as harvested by selecting the “Harvest” item. To add weight to a harvested tree, go to the navigational footer, tap in the hamburger menu to open the “MORE” view. Tap on the “Harvest” item from the list and tap on the weight icon to log your harvest weight.
      Thanks for contacting us!

    • Hi Katherine, for pots with soil, I recommend flushing with clean, room temperature water. Regarding the amount of water needed, a good rule is to calculate 3 times the volume of the pot. For example, if your pot is 5 liters, you can flush with 15 liters of water per pot.
      An easy way of doing this is carefully placing each plant in a shower or bathtub and add the water gradually to the soil, without drowning the plant. The excess of water will slowly drain from the bottom of the pot. A good visual sign is that, in the beginning, the water coming from the bottom of the pot will be dark and will gradually turn to a lighter color. If you don’t have a bathtub, you can do it inside the tent. Place a container under the pot for collecting the excess water, be careful or this may result in a bit of a mess. By running this process once in each plant, most of the salt buildup should flush away from the substrate.
      I hope this helps!

  1. Does a feminized plant die after harvest and flowering?

    Does a female plant die after harvest and flowering?

    To continuously harvest is both a male and female plant needed?

    • Hi! Yes, Cannabis is an annual plant. Although it may revegetate, usually after flowering the female plant is harvested and dies. To have a continuous harvest without buying or getting new seeds, you may cross male and female plants or make clones (cuttings) from a female plant and grow new plants from them. Thanks!!

        • Hi Allen! Some plants die when it frost or snows and some do not but yields may be damaged so many people choose to harvest before this happens. You can cover your plants with a frost blanket to protect them (like the ones used for fruit trees) if they are still not ready to harvest. For next year, you can look at charts of your area marking the beginning of frost season in advance and germinate seeds with a short flowering period counting the weeks to harvest just before the frost comes. You can find this information online and use it to plan ahead your grow. I hope this helps! Happy growing!

  2. I use the app but the website as added value is money.
    This should be the first thing to pop up on google, no one talks in depth enough about the veg cycle.

    Awesome knowledge!!!

  3. Hi-Alicia, great article thanks!
    I am amateurly growing from a seed I found in a nug from a dispensary (don’t know the strain or type) and just mainly been playing around to see if I could get it to grow a little. I only have natural light and supplemental lamp light for 18 hours a day. I now am in about my 5th week and it is about 19 inches tall with only 5 and a halfish sets of leaves (looks very tall and sparse compared to your photos) and I can see what looks like female indicators at the intersections of the stems. Now that I am thinking it is a female plant I am trying to see if there is any way to actually get some smokeable weed.

    I am wondering if you have any suggestions for putting this particular plant into the Flowering Stage. It is already very tall and I see that it might double in size once getting only 12 hours a day of light. I was thinking I will repot it in a large pot and maybe look into tomato grow cage, let me know if you have any other suggestions!

    • Hello Ashton! To be sure if your plant is a female, check the nodes (where the branches meet the stems) for signs of preflowers. Here’s an article I wrote about how to determine your plant’s gender, what and where to look for
      For putting your plant in flowering stage, make sure you have proper cannabis nutrients to feed her and be consistent with that feeding schedule. Bat guano with high levels of P and K works great for flowering too. Repot your plant in a larger pot, filling with worm castings and perlite. The tomato cage works great to guide the plant and hold it, go for it.
      Change the photoperiod to 12/12 and make sure there are no interruptions in the dark hours, this may stress out the plant and delay flowering.
      I hope this helps and you’ll soon be harvesting your own buds.
      Thank you so much for reading and commenting. Have a nice day and happy growing!

    • I am growing one plant outside, full sun. No tomato cage needed. 5 gallon bucket use drill to put drainage holes. Fertilize every other day with 3 part, grow, micro, bloom, by PH Petfect Technology.

  4. Hi! I’m a first time grower and although I’ve made a few errors, I think I’m doing ok. You are so knowledgeable, I’m very glad I found you!
    Fingers crossed my babies will continue to thrive.

    • Hello Lisa! Congratulations on your first grow and thank you so much for your kind words! I’m really happy to be helping the growing community. I know there’s a lot of information and things to do but everyone can grow their own! 🙂
      Continue reading one article at a time, according to the stage your plant is in right now, and soon you’ll be harvesting your own grown!
      Thanks again for reading and commenting. I hope you find our app useful for planning and tracking your grow.
      Have a great day and happy growing!

    • My plant is 10 weeks old and not much flowering going on. The feeding chat I’m following gives me until 12 weeks and the 12th week is just flush. If my plant passes the 12 weeks and not much flowering. What should I feed it?

      • Hello Safiya, some strains take 4-6 weeks of vegetative growth and then 10 weeks only to flower, so a 10 weeks old plant may have ahead several more weeks of flowering. Knowing the strain you are growing may give you a guide of how long the flowering stage may take.
        Both flowering dates and feeding charts are approximate. A 12 week feeding chart may be great for autoflowering strains and some Indicas but insufficient for many photoperiod strains, especially Sativa dominant strains, which take longer to develop. So, if your plant seems to have several weeks ahead, you can just keep giving her the last dosage (week 10-11 in your chart) until 1-2 weeks before harvesting. Then you switch to watering without nutrients, only water. Also, consider flushing your plant if you’ve been growing with strong chemical fertilizers.
        If you see signs of overfertilization such as brown tips on the leaves of very dark fan leaves, it’s time to lower the dose or start flushing.
        Here’s an article I wrote on how to know in advance when to start preparing for harvesting, with pictures and instructions.
        I hope this helps.
        Thanks for reading and commenting!

  5. Hi this is my second time trying to grow. I started this plant on August 2. I changed the pot but I need to put it in a bigger pot. Is it too late? What stage is my plant currently in?

    • Hi! If your plant is still producing new leaves and stems, it’s still in the vegetative stage. You can safely transplant it to a bigger pot. Consider adding organic matter, such as compost or worm humus and some inert materials, such as perlite and/or vermiculite to your soil mix, as this helps the plant to grow healthy roots and recover faster from transplant. Thanks for reading! Happy growing!

  6. Hello, first outdoor grow is looking good. 2 of my girls are are full of trichomes and clear, pistols Hairs are turning brownish in color. How many days b4, the trichomes start turning amber and cloudy? Thanks for the Awesome info, and timelines.

    • Hello Freddie! Congratulations on your first outdoor grow! There may be several days to a couple of weeks until trichomes reach cloudy and amber colors, so be patience and continue to look for changes! The actual moment for harvesting varies upon each grower’s choice and strains. Pistils may turn brown even if the plant is not ready for harvesting, for example for environmental reasons, so it’s very important to check the trichomes. Thanks for contacting Grow with Jane!

  7. Hello, I am growing autoflowering seeds, I always make PH 5.5-6.5 is it good? because you said 6.5-7.0. I have 1000watt quantum board on a heigh of 1.20meter (is it good distance) it has dimmer control so how to control it? start from 50% of light and then increase in vegetative stage and 100% of light in flowering stage? Also some growers told me to raise humdity to 70-80% in vegetative and 50-60 in flowering stage. Sorry for my bad English. Wait for your respose Thank you very much <3

    • Hello! Thanks for reading and commenting! I’m sorry, that was an error. For soil mixes, we recommend a 6.0–7.0 pH, for soilless and hydro 5.5–6.5 pH. Some growers get excellent results with pH 5.5 to 6.5 in soil mix. This is just a guide, you should always watch for color changes on the leaves and growth rate. These are the best indicators if there’s something wrong with pH it will mess up nutrient uptake. If your plants look good, green and healthy, there’s no need to correct pH levels. When they start showing deficiencies, then it’s time to check and adjust.
      Each LED panel has its own specs, so follow the manufacturer’s instructions on dimmer control and distance for better results. It sounds like a good distance, maybe you can lower it a bit more. Always watch for light burn, it may happen even with LED panels. Some signals are scorched pistils, leaves pointing upwards or with borders curled up like a taco, and some plants even get their top leaves bleached. In this case, increase the distance between lights and canopy.
      High humidity levels (above 70%) in the vegetative and flowering stages may increase the chance of growing mold, bud rot and attracting other pests. There’s no need to raise humidity and it may be harmful!
      Happy growing! =)

  8. This is by far the most best piece of information I’ve come across, wish you could have also touched on propagation methods as well.

    • Hi Dipolelo! Thank you so much for reading and sharing your feedback! Now I’m writing new content about nutrients and pests, but I’ll be writing about propagation methods soon.
      Stay tuned!

  9. This is an awesome reference! Thanks so much for the info… especially for us first timers!

    My plants are in week 6 and looking great and fairly bushy. I’m also training them and putting in a canopy net. During the vegetation stage, should I be trimming or pruning to encourage more growth or not?

    Thanks again!

    • Hello Mike! Thanks for leaving your comment! I’d suggest starting with a low-stress pruning technique called “Lollipopping”, which involves removing leaves from the bottom of the plant, so she focuses her energy on growing bigger buds in the canopy.
      Some tips before starting:

      – Start lollipopping your plants at least 2-3 days before switching to the flowering stage.
      – First of all, work with sharp trimming scissors or shears, depending on the size of the branch, previously disinfected with alcohol, to avoid infections.
      – Only trim bottom leaves below the net. It depends on the size of the plant and the environment, but maybe 2-3 nodes from the bottom are enough for a small plant. Those leaves are probably not receiving any light anyway so budding sites there would produce small “popcorn” buds.
      – Start small, do not remove all leaves at once, this may cause stunted growth and lower yields.
      – Trim some upper leaves in the middle of the plant, especially if they are laying on top of a budding site and preventing light from reaching said bud or if you find water patches on those leaves.
      – Prune any small or dying bottom branches or leaves.
      – Be extra careful not to damage any bud sites.
      Warning: every leaf is valuable for the plant so it’s better to defoliate in a progressive way rather than cutting all the leaves at once. As plants do not grow more leaves on the flowering stage, almost every leaf you cut it’s not growing back and the plant needs those for functioning.

      Properly done, lollipopping is an effective technique to maximize yields. It’s very useful to track dates and take photos of the process to learn and check the results.
      Happy growing!

  10. Hi. First time trying to grow from seed.

    First three seedlings fell over and shoot separated from the root exactly at soil level.

    Too much water?

    • Hi Fred! Sorry, we can’t do that here. We have a Growing Community where you can post pics, ask questions and share your experiences You are welcome to join!
      To get personalized and private Grower Support, send your question as an in-app message in the Grow with Jane app. There you can add your pics so we can take a look and give you private feedback. If you’ve already been using the app we can see your Growlog and give you better diagnostics based on your tracked actions and photos!
      Download for free at and contact us, we’ll be happy to help!
      Have a nice day and happy growing!

  11. Hi this is my first time growing I’ve put 3 seeds into a pot and already after afew days they have all come up do I need to separate them or leave them all together I’m doin them outside with the heat etc but do bring them in at nite thanks

    • Hi Debbie! Always grow your seeds in separate containers so they can grow without competition from one another.
      Hoping the best for your grow! If you have questions about your plants, please download our app from and contact us via in app message. We’ll be happy to help!

  12. I’m a bit confused with the breakdown of each stage in weeks. It looks like some sections tell of progress in weeks from the seedling stage, others have weeks that seem to begin from the start of a later stage and not from the seedling stage.
    I know it’s going to be different from plant to plant but perhaps a dual-week gauge can make things easier to understand. i.e.
    seedling 0 – 3 weeks
    flowering starts between 6 – 12 weeks from seedling
    3 – 6 weeks after the start of flower (9 – 18 weeks from seedling) do this

    I’m not sure I’m being clear, but when I read the guide I was confused.
    One last suggestion… Can you pls add ºF to temps?

    • Hi Richard! Thanks for reading and commenting. Your observations and suggestions are on point! I will be editing and clarifying those soon as I’m planning to update these guides with new info. Happy growing!

  13. Hi Alicia,
    Great information, may I suggest that some of your information includes details on Hydroponics and take into account autoflowers. Many thanks.

  14. Hi, I grow in an indoor green house. I start my flower stage with light off 6pm-9am for 3weeks already, plants show signs of flower at this time. Now I think I want to get the plants more day light so now I do light off from 7mp-8am. My question is this changed will cause any harm or confuse for the plants, or I am still do ok no harm. Another question is when in a day that is raining or snow and the cover tarn of the green house can not open/remove to get the plants their 12h of light, what is the right way can be done. At this situation, the tarn cover the green house can not open so can I leave the green in total darkness but I will turn the light for the plants 12h of light on, Is this way ok or please correct me the right way to do, I am a beginner.

    • Hi Kgyang, critical inductive photoperiod (hours of light/darkness needed to start flowering) varies significantly among strains or cultivars. This may go from 10 to 14 hours or more, some cultivars are not light dependant. Many growers settle for a 12/12 photoperiod to make things easier but it may be more or less depending your cultivar. Once flowering is on, it’s better to be consistent with the hours of light and hours of complete darkness to avoid “confusing” the plants. The risks of this confusion could be delayed flowering, revegetating (going back to vegetative growth) and some people report hight levels of hermaphroditism as well, as a result of this kind of stress. If you’ve got supplemental light, you can use that during the hours of snow or rain when you are not able to get sunlight. Even low intensity lights would do the trick to maintain photoperiod, but they won’t contribute that much to flower development as high intensity light or PPFD levels from sunlight would. Please, feel free to download our Grow with Jane app and send a message to our Grower Support team, and join our Growing Community as well to share your case with more detail. Thanks for reading and commenting!

  15. Hello. My plant is at the beginning of week 8 in bluming stage and look just like your wk 8 pic. My question is when do we harvest? Now or still another wk? I haven’t flushed them yet.

  16. Pingback: Cannabis Plant Anatomy and Cannabis Plant Growth Cycles
  17. so i’m new to growing any type of seeds but, i have left my seedlings in a container with consistent airflow and humidity but they still seem not to wanna sprout i have one seed out of my 4 that i’m trying to sprout and only 1 is how do i fix this problem ?

    • Hi Gabriel, some seeds take more time than others to sprout. Check temperature and humidity levels to make sure your seeds have the perfect conditions. Cold temperatures are one of the main reasons for late sprouting. Old seeds usually take more time to sprout.
      Here’s a step by step guide on how to germinate Cannabis seeds with lots of tips.
      The best temperature to germinate Cannabis seeds is 25° C / 77°F
      The best relative Humidity to germinate Cannabis seeds is 70 / 90%

      Thanks for reading and commenting, happy growing!

  18. Hi-I have a 4 by 4 tent and a Phantom Pheno 440 LED light. I have 6 beautiful healthy plants that ate 3 wwks old getting 6 hours light daily. I have repotted once. I use organic roots 707- some folks say do not feed them as 707 is a complete start to finish soil. Should I use some light fertilizers at any point like grow big etc. Incidently-I am an 89 yo mom growing weed for my son who had a massive stroke at 48 and he doesnt particularly like the weed we are buying here in Virginia!. He was an outdoorsman in Colorado for 30plus years and now lives with me-paralyzed on his left side. I have grown one small plant that he said was very very good!
    Thank you

    • Hi Eleanor, thank you for sharing your story, I’m glad you are succesfully growing for your son. Organic Roots 707 is a peat based media with some coco among other materiales. On their site they recommend to begin feeding your plants 10 to 14 days after transplanting but as each plant and strain has different needs, that may be a little sooner or later. If the leaves are dark green it means it has lots of nitrogen and doesn’t need more. If they are becoming light green means they already need fertilizing. Here’s a guide on nutrients for cannabis plants, if you have any doubts please leave your comments and I’ll be happy to help.
      I hope you find the site useful, you are welcome here anytime. Thank you again for commenting, happy growing!


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