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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. slowpaya says:

    it will flower by itself when it is ready

  2. Okbloki says:

    @juggalo

    If its got little white hairs, theyre already flowering so you need to add some food that helps promotes this and continue as normal.

    If there are no hairs present, try letting them sit in dark for 13hrs once the lights go off then proceed with your 12/12
    Knowing what strain youre growing out also helps. ;D

  3. juggalo says:

    so i am dumb and started my plant on 12 on and 12 off how would i be able to start flowering, like what should i turn the on and off to? it is about 5 weeks old running on 12 on and 12 off and is 13 inches high, can anyone help

  4. jj says:

    Aaron,

    Yes, you can transplant into new pots. It might slow growth down for a day or two, maybe not.

    Im guessing it will be worth the loss of time in terms of better yield, if it does slow it down any.

  5. toots says:

    what do you do with the flowers that have seed pods do i leave alone or pull or ?i read about the heater would do it and it did will it cause a problem with the other girls.

  6. aaron says:

    hey just wondering my plant is in its first week of flowering and its getting to big for its pot, is it alright to transfer to a bigger pot or will that stunt the growth of the buds and produce more leaves.

  7. Richy907 says:

    Chedder – veg your plants for 3 1/2 four weeks or until u have atleast 5 to seven branches
    if your growing in a tent your limited on space so u want to think about how tall your plants are gonna get once u put them in to flower they will double in size in the first two weeks

  8. Magda says:

    Keep it comnig, writers, this is good stuff.

  9. chedder says:

    hi,this is my first grow,iv got a 2.4mx1.2mx2m greenroom tent with a 1000w hps and a 600w hps running side by side. i hav 18 cheese plants in 11 litre pots which i got from a freind as clones. im into my second week of veg now on a 24 hour cycle.

    The plants are doing very well and all average 10 to 12 inches tall. My question is, when would be the best time to start flowering these beauts? also, I’m using special gold all mix so i havnt used any nutes yet as there already in the soil for 2 to 3 weeks arnt they,so should i even bother with the veg nutes?or just go straight into the bloom nutes?any info would be appreciated guys

  10. Aone.aka..da strain hunter says:

    Don’t put a heater in with your plant the heat can stress your plant ..only if its freezeing cold plus cooler temp s…..can help your plant change colors that’s how you get some purple color on some strains

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