Sexing

Discussion in 'General Marijuana Growing' started by robert 14617, Jun 17, 2010.

  1.  
    robert 14617

    robert 14617 Well-Known Member

    What are preflowers?

    Preflowers, as opposed to full blown flowers, generally appear after the fourth week of vegetative growth from seed. Check carefully above the fourth node. Please note that preflowers are very small and and almost impossible to differentiate without magnification. A photographer's 10x loupe is handy indeed when examining preflowers.

    As the images below demonstrate, the female preflower is pear shaped and produces a pair of pistils. Frequently, the female preflowers do not show pistils until well after the preflowers have emerged. Thus, don't yank a plant because it has no pistils. Pistillate preflowers are located at the node between the stipule and emerging branch.

    Also, some female preflowers never produce pistils. A female preflower without pistils is difficult to distinguish from a male preflower. Thus, hermaphodite issues should not be resolved by the appearance of preflowers, without pistils, on a plant otherwise believed to be a female.

    Female (pistillate)

    [​IMG]


    Female (pistillate)
    [​IMG]


    The male preflower may be described as a "ball on a stick." However, its most recognizable feature is its absence of pistils. Sometimes, a male plant will develop mature staminate flowers after prolonged periods of vegetative growth. These appear in clusters around the nodes.

    The following image shows a male plant in early flowering. Staminate flowers are located at the node between the stipule and emerging branch.

    Male (staminate)
    [FONT=verdana, arial, helvetica] [​IMG][/FONT]

    [​IMG]










    These pictures and quotes were donated from a sexing thread about identifying females by their pre-flowers (primordia) which was authored by "Crazy Composer". The pictures alone speak a thousand words...



    [​IMG]
    Note: The plant parts marked with an "X" are called "stipules", they appear on both male and female plants.


    This diagram shows the difference (on a slightly more mature plant) between genuine pre-flowers and actual bud sites, which are - in fact different animals altogether.
    [​IMG]


    From a further distance, but quite clear-cut.
    I know how it is for some of the newer growers who are eagerly anticipating their first view of an actual marijuana flower. Well, this is what it looks like, play your cards right and you'll have thousands of these hairs clumped tightly together and covered in crystals that will smell so nice. Don't worry, it's coming.
    [​IMG]




    What does an emerging MALE preflower look like?


    Identifying a true preflower is way to tell sex before 12/12. That way you can take clones from the known females without wasting the time and space on males.

    Note:
    (Kifit) "do not try to sex a seedling based on the very first preflower you see with a 25x times microscope.....wait and make sure. The time between using a 25x to spot the very first preflower sex and the plant dropping pollen is at least 10+ days away and so it's safe."

    "It's best to cull a male only after you are 101% sure - when you see 2 or 3 (or more) immature male flowers bunched together on the internodes or the top growing tip - this is a male, for sure, females preflowers have white " spears " that appear in a vee. ..but "every now and then a sexually indistinguishable flower appears" (Ed Rosenthal)

    After a few weeks in veg, plants will begin to show their sex. Usually the males show first. The male preflower is a miniscule ball. It appears that there is a small piece of foliage that covers the ball and protrudes outward when the male preflowers first appear.

    The following pics show MALE preflowers the FIRST day they show their future pollen distribution centers.

    Many times preflowers will appear at the fourth or fifth node, whereas the plant is on the 7th or 8th node. These preflowers usually don't develop into full flowers, but are only an indicator of the plants sex.

    [​IMG] [​IMG] [​IMG]



    [​IMG]Female on left, male on right. Im only certain about the sex cause I watched them several more days. 25X magnification.

    After 10 days flowering, what does a female look like?

    The following image clearly displays a female plant at about 10 days flowering, using a 400w HPS. NOTE: Indica dominant strains will flower faster than Sativa varieties.


    [​IMG]







    After 10 days flowering what does a male look like?

    The following image displays a male plant at about 10 days flowering.



    [​IMG]






    How do I sex using a paper bag?


    Get a small paper bag or something similar that is lightproof (a paper bag will not be suitable for strong H.I.D lighting), and a plastic coated twist tie.

    Select a plant that you would like to sex and choose a growing tip. Take the paper bag, place it over the top of the selected tip and seal with the twisty tie. Then, to simulate the flowering phase, simply remove the bag after the 12hr dark period, and replace when the 12hr day cycle ends.

    After 7-14 days, the growth-tip you covered should start showing signs of its sex.

    Editor's note:
    Caution should be taken when closing the bag too tightly around the branch.
    A small opening should be left open to allow air exchange and prevent heat buildup. Black materials tend to heat up and the branch may suffer from excess heat, causing wilting.

    (10k)
    "There is plenty of air inside the paper baggage because it would hold its own blown up shape...sorta balloned over the branch tip."


    This is for people that dont have room for clones or just want to know the sex of there plant without takeing and rooting early cuttings.

    Things you need:
    1 can of black spray piant
    1 box of plastic ziplock baggie (sandwich bag size)

    Take the plastic baggie and spraypaint the outside of the baggie, then find one of the lower branches that is furthest from the light (this will insure that light reflection on the black paint isnt too intence for heat buildup)and just simply slip the baggie over the branch for 12 hours of darkness.

    If you have painted the whole baggie, then no light will get through to the branch when the lights are on. You will see sex on that one branch in 7 to 10 days in most cases.



    Flower Biology



    [​IMG]A bud is a cluster of single female flowers.

    As you can see in the pic, this cola is composed of several sub-units that are will fill out before reaching maturity. In this phase, the plant has finished the stretching phase and is developing bud sites.

    Depending on the strain, bud development may start in the middle of its flowering period.





    What is an hermaphrodite?

    An hermaphrodite, or hermie, is a plant of one sex that develops the sexual organs of the other sex. Most commonly, a flowering female plant will develop staminate flowers, though the reverse is also true. Primarily male hermaphrodites are not as well recognized only because few growers let their males reach a point of flowering where the pistillate would be expressed.

    Hermaphrodites are generally viewed with disfavor. First, they will release pollen and ruin a sinsemelia crop, pollinating themselves and all of the other females in the room. Second, the resulting seeds are worthless, because hermaphrodite parents tend to pass on the tendency to their offspring.

    Please note that occassionally specious staminate flowers will appear in the last days of flowering of a female plant. These do not drop pollen and their appearance is not considered evidence of deleterious hermaphroditism.

    Here's an image of a hermaphrodite, specifically a female plant with staminate flowers.

    [​IMG]

    [​IMG] [​IMG]


  2.  
    streetlegal

    streetlegal Well-Known Member

    haha i just answerd 2-3 posts concerning exactly this.. good one rob, legend.. rep if i can homes
    robert 14617, callmebud and MrNash like this.
  3.  
    sickstoner

    sickstoner Well-Known Member

    SO what is it? ..............lol good job
  4.  
    robert 14617

    robert 14617 Well-Known Member

    i jacked this from another site, someone linked this on another thread a couple years back and i moved it here
    marlfox117 and ROBSTERB like this.
  5.  
    sickstoner

    sickstoner Well-Known Member

    don't be so modest Still good job for spreading the word of grow
    robert 14617 likes this.
  6.  
    KaleoXxX

    KaleoXxX Well-Known Member

    nice thread, lets hope the newbies use it
  7.  
    growlegal

    growlegal New Member

    ++Rep and I can LOL
  8.  
    Anonymouse

    Anonymouse Active Member

    Nice post, and to see it all in one place should be very helpful to the new growers. This used to drive me crazy when I first started, but I learned my girls quickly show their sex (4 weeks veg, clones in just a few days in the hydrogarden) and the males didn't show anything for 6-7 weeks.
  9.  
    robert 14617

    robert 14617 Well-Known Member

    thanks mouse ...rob
  10.  
    harry brown

    harry brown Member

    nice post cheers for the info > rep
    robert 14617 likes this.
  11.  
    robert 14617

    robert 14617 Well-Known Member

    thank you harry
  12.  
    icantseemyface

    icantseemyface Active Member

    if you smoke male polen sacks can u get a lil high??
  13.  
    robert 14617

    robert 14617 Well-Known Member

    not something i would ever try , maybe someone else here has
    crazyhazey likes this.
  14.  
    mae

    mae Active Member

    Rob, thanks for the tip on using magnification to see preflowers. My loupe is expected to come tomorrow and I didn't know we could use it for this. This will help me a lot.

    Great post.
  15.  
    crazyhazey

    crazyhazey Well-Known Member

    Pretty tragic how i just figured out 2/3 of my plants are males, but thanks rob. +rep.
    robert 14617 likes this.
  16.  
    Jmayne Chronic

    Jmayne Chronic Member

    awesome man very helpful
  17.  
    Jmayne Chronic

    Jmayne Chronic Member

    ugghh i cant even imagine if anyone would ever try this, i would think you would go into a horrible coughing fit and not the good kind, dude you are inhaling pollen! id say the only way this would get you high i think is trying to hold the acrid smoke in and starve your brain of oxygen
  18.  
    jay dawg

    jay dawg Member

    Nice post cheers, i am new to growing and this article has helped alot. i had a batch of the nirvana auto NL but they didnt auto flower so i put them on 12/12 and after 2 weeks i hav good preflowers. Afta reading this i think i hav 1 male and 1 possible hermie but it mite be to early to tell yet wiv the hermie. Do female preflowers typically come in pairs cos thats wot it looks like on the three definate females? I cant see balls as such on the possible herm bt the white hairs seem less frequent than the others and arent in pairs either side of the nodes like the others. do we think it is a herm or just a late bloomin female?
  19.  
    JimBro

    JimBro Active Member

    I used this post to sex my first two plants that both turned out to be male. Great info, even though it turned out bad for me. I've never tried smoking males (that just sounds wrong), but I have cooked with them. Not the greatest high, but it beats feeding them to your turtles.
  20.  
    OldGrowth420

    OldGrowth420 Active Member

    great thread nukka
    robert 14617 likes this.

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