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Marijuana Flowering

Marijuana Flowering

If you want your marijuana plants to start pre-flowering just change the light cycle to 12 hours on and 12 hours of complete darkness. This convinces the plant that the days have got shorter and now is the time to flower.

Why does this work, well let’s think about how plants are in their natural environment. Marijuana like most plants start off growing from seeds in early spring, then go through their vegetative stages in the later stages of spring and all of summer and when fall comes and the days start to become shorter during fall/autumn there is less light and more darkness and this triggers the plans to flower, or bud. So when you are growing indoors professional growers move from a 24 or 18 hour vegging light per day to 12 hours on and 12 hours off.

pre-flowering female marijuana

Although, while waiting for marijuana to flower can seem to take forever, once your plants truly enter the flowering stage their growth rate can be stunning. Growth patterns and nutrient cycle timing and requirements will change. The vigorous vegetative growth will slow, stems will elongate and flower formation will begin rapidly at first before slowing. If you are growing hydroponically you should now be using a bloom or flowering mix of hydroponic nutrients. If you are growing in soil you should add a fertilizer that is high in phosphorous and potassium such as ‘Super Bloom’. Read more about marijuana nutrients.

Whilst in the flowering stage it is important that plants receive no light outside of their 12 hour day cycle. Any light received can confuse and stress plants leading to abnormal growth. Make sure the room is light tight. More information on marijuana lighting.

  1. Note that less than 12 hours light will reduce flowering speed and overall yield.
  2. Note that putting the lights on during the 12 hour dark period a number of nights in a row, even for a few minutes can revert the cannabis back into its vegetative growth cycle.
  3. Trick you can use a green light bulb in the grow room to help you work while the cannabis is in darkness. Green light will not affect the plants.
  4. Trick some growers will give their babies a full 36 hours of darkness to send the message that flower must begin. This usually decreases the time in which flowering begins.

These days you can also buy auto-flowering marijuana seeds that will start to flower after a certain number of weeks.

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From the forum

How to Grow Marijuana Forum - Growing Marijuana Indoors & Hydroponics

111 thoughts on “Marijuana Flowering

  1. Letmeknow says:

    Hi

    Have been in the 12/12 stage for 6 weeks and all I have is a lot of seedling pods all over my 4 foot high branches. Why do I have all these seedling pods? What can I do to move it to a true flowering stage?

    Thanks

    • GameChanger says:

      Throw plants in 12/12 light cycle with HPS lights
      First time grower Best Nutes to use it GH
      3 part or nova series.
      Follow the directions on the back….
      Feed around 1000ppm in beggining of flowering.
      each day is different.. monday you should Feed.Tuesday Water, wednesday wait. thursday Feed ect…
      This is a great diet plan for your plants.
      you can always add bloom boosters to your feed .. make sure your ppm is never higher than 1300 in beggining of Flower.
      Week 5-8 ppm’s can up to 1500.
      Make sure you start flush end week 7 for about 2 weeks..
      Flush plant until Water run off read below or between 150ppm and 300ppm
      when plant is done cut it down and dry in same area or something simalar.
      Dry until stem cracks..then throw it in a jar opening 2-3 times daily. keep jar in a dark place.
      If your bud looks and Taste like crap, theirs no 1 to blame
      BUT YOUR STRAIN!

      If anyone would like to add to this please do

    • Kc says:

      You sir most likly have a male plant or maybe a fertilized lady depends on your set up and where you got your seeds

  2. Mike's reason says:

    I am a first time grower. I am having problems sexing the plants. My plants are growing little leaves where the stems meet. The last batch grew seed pods during flowering stage.

    • Amber says:

      Hey! Just get feminized or auto flowering seeds! I got Narcotic Kush. So, all I did was pop it in good soil mix,water, wait…boom! Two days!Germination! I got my big metal halide goin’, she is a beaut! Shorr and super full, we are at the preflower/flower stage!
      No sexing, no guessing, no worries! AND she coukd reach 22percent THC. Pretty fine for an auto!
      IRecommend plantin in whatever she’s to grow in.
      Gonna do an auto N. lights next!
      I know it’s a bit lame, but, I’ll get ro the sexing and all, right now, I just don’t wanna pay 300 for what I can grow for 30!

  3. tommyhawk85 says:

    1st time grower, long time smoker. I have a 3’hi x 2’wide x 10”deep hydroponic box. reflective liner. I have 3 female plants about 6” after 7 weeks. fairly bushy I’d say. I think they should be taller. maybe not. should I start the flowering cycle? my ladies are on a 18-6 cycle now. I’ve been reading the posts and some of them read like russian to me. any help would be appreciated.

    • Jandyweed says:

      Sound awful short for 7 weeks – what are you feeding them?? I was having problems and took others advice and switched to GH Flora 3 part series nutes. Have not looked back – 4 week old girls were 2 foot tall – changed lights to 12/12 and in a week they are nearly 3 foot with heads beginning to form already – BEAUTIFUL. I’m using a new home made small scale flood and drain system – its the best. Hope this helps Cheers

    • Jamal says:

      Its up to you Tommy. Remember that they will stretch a bit during flowering so with such a short box maybe it is time to flip them. I would normally wait a bit longer, but do not have the same height restrictions as you. 3′ height space + plants + lights doesn’t leave you much room. So yeah, flip them now.

  4. melmel32 says:

    ok. we took cuttings off our plants that are growing outside…they are indivieually planted and now starting to grow buds what should we do? cut em off? leave em?

  5. christina says:

    Ok i have a plant that i have been growing since early september and it is still not flowering. i kept the light on it up until a month ago and niow im doin the 12 and 12 and i stil see no sign of flowering… but the plant is continueing to get full and grow tall what else can i do to make it start to flower

  6. #1closetgrowah says:

    floweering is the most exciting stage..but u must be patient..and caring and ur plant will give back!

  7. mark says:

    first timer ,My plants are outside and starting to flower do you trim leaves and fertalize they are about 6ft,looking to promote bud growth!!!

  8. Sammii says:

    Hi! So i have a nice girl not sure how old but has been in 12/12 for about a week now. She is flowering already. I had a reflector cuz my light is facing the wrong way and it fell on her and broke a stem…. will this kill her? Also what kind of light should i use? What nutrients should i use??

  9. dang ol stoner says:

    …Perhaps the one major advantage Alaskan growers have is ready access to high-nutrient soil. Soil in and near river banks is particularly high in nutrients….
    That’s how they grow those giant vegetables at the Alaska State Fair!!!5

  10. dang ol stoner says:

    …Oh yes, almost forgot…Make sure the walls have insulation!
    Nothing kills plants faster than a sudden burst of arctic chill!!
    I understand the folks living near mountain passes and open plains regions are particularly susceptible….

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