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OfflineFarmer Joe
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Registered: 09/03/09
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sexed under 24 hrs light?
    #349226 - 01/18/10 09:47 AM (6 years, 10 months ago)

I thought I read in a post somewhere that it is possible  when maturity is reached. I searched the main site and forum, but no dice. Haven't googled it yet. I'm sure it is just something very common that I happen to know nothing about. (Only have experience growing with clones)

Currently growing mandala's early queen, mr. nice speed queen, ppp and 3 fem'd ww from nirvana.

Out of 5 ppp 3 have shown sex and 1 was male.
2 out of 8 mandalas have turned out male.
1 mr. Nice turned out female.

Plants have been under a ho t5 setup. Light cycle has been at 24 hrs. Going on 40 or so days.
I was trying to let a few smaller runts catch up to the other healthy stronger (prob male) ones. We switched the light cycle last night to 12/12.

Hit me up with some info.
Thanks ahead of time.


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"Marijuana may not be addictive, but growing it is" - ED Rosenthal



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InvisibleDrGreenThumb
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Registered: 08/09/08
Posts: 487
Loc: Phish Tour Flag
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Re: sexed under 24 hrs light? [Re: Farmer Joe]
    #349229 - 01/18/10 10:03 AM (6 years, 10 months ago)

Yes definitely possible. When your palnts are 4-6 weeks old usually they will show preflowers. These are located on the main stem where the branches meet the stem. Female preflowers consist of 1 calyx with 2 tiny hairs coming out it.
When your plant matures enough in veg it should be no problem to tell their sex before flowering.


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“Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” -Dr. Seuss


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OfflineFarmer Joe
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Re: sexed under 24 hrs light? [Re: DrGreenThumb]
    #349242 - 01/18/10 11:00 AM (6 years, 10 months ago)

Thanks :thumbup:


--------------------
"Marijuana may not be addictive, but growing it is" - ED Rosenthal



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InvisibleInverted
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Re: sexed under 24 hrs light? [Re: Farmer Joe]
    #349401 - 01/18/10 05:02 PM (6 years, 10 months ago)

Actually sooner than 4-6 weeks with optimal growth and knowledge of early preflowers.

If I consider it to be a smooth run, I can usually sex the plants between 20-26 days from popping the surface.  You just have to be really comfortable with identifying males from females from first emergence.

I female will generally look like a green pin coming out of the node, where as a male will look like a green grain of sand, more round than anything. (EDIT - Do not confuse the pin with the Stipules (green spikes) which are much larger)

99 out of 100 times I have correctly identified them using that as a reference.  I would take pictures but it's almost not worth it because they can be so small when I make the decision.  Males almost always show first by a week anyways so if they show me a little tiny round grain, they get tossed, otherwise they will have a tiny pin like thing and will eventually shoot out a set of hairs from that soon to be calyx.

When in doubt let it sit a few more days.  It would take a couple weeks after sexing for a male to even be able to open a sack.

Long story short, they start showing after 3 weeks, males first (usually) regardless of the light cycle.  The plants I flowered before showing sex had a much harder time transitioning to flower production than the plants that had visible pistils going into 12/12.

That's why this run I'm waiting an additional 2 weeks to ensure the plants live up to their potential and yield.


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InvisibleDrGreenThumb
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Re: sexed under 24 hrs light? [Re: Inverted]
    #349409 - 01/18/10 05:15 PM (6 years, 10 months ago)

I agree with you there Inverted. I can usually tell by week 3 but you have to know what your looking for. However, I always wait until I see the hairs before I make a decision since small plants don't take up much room in my veg closet anyways.


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InvisibleInverted
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Re: sexed under 24 hrs light? [Re: DrGreenThumb]
    #349427 - 01/18/10 05:47 PM (6 years, 10 months ago)

:thumbup:

You got it down DGT.  I usually can not ever spare any room so I am always racing to find out the sex.


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Invisiblecoda


Registered: 04/20/08
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Re: sexed under 24 hrs light? [Re: Inverted]
    #349485 - 01/18/10 06:46 PM (6 years, 10 months ago)

Quote:

The plants I flowered before showing sex had a much harder time transitioning to flower production than the plants that had visible pistils going into 12/12.





This is mainly due to the fact that plants that haven't shown sex before flowering are usually not sexually mature.  So the plant requires a little extra time to produce the flowering hormones.  There are some out there who believe flowering before pre-flowers increases hermaphrodite chances, but I haven't seen any solid evidence to back that up.  Plus there are plenty of people who go straight from sprout to flower to keep things small.


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OfflineFarmer Joe
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Re: sexed under 24 hrs light? [Re: Inverted]
    #350058 - 01/19/10 07:12 AM (6 years, 10 months ago)

Thanks for the info inverted. Much appreciated.:gethigh:


--------------------
"Marijuana may not be addictive, but growing it is" - ED Rosenthal



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InvisibleInverted
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Re: sexed under 24 hrs light? [Re: Farmer Joe]
    #350148 - 01/19/10 02:22 PM (6 years, 10 months ago)

Quote:

coda said:
Quote:

The plants I flowered before showing sex had a much harder time transitioning to flower production than the plants that had visible pistils going into 12/12.





This is mainly due to the fact that plants that haven't shown sex before flowering are usually not sexually mature.  So the plant requires a little extra time to produce the flowering hormones.  There are some out there who believe flowering before pre-flowers increases hermaphrodite chances, but I haven't seen any solid evidence to back that up.  Plus there are plenty of people who go straight from sprout to flower to keep things small.




That's the assumption I had come up with as well.  I was fairly disappointed as this was the first time I've ever flowered plants that were not sexually mature.  I'm bumping the veg time up from 31/2 to 5+ weeks with my next set.  They are on day 24, So I'd say they'll head in a couple days after the current harvest occurs.

Quote:

Farmer Joe said:
Thanks for the info inverted. Much appreciated.:gethigh:




No problem man, I try to provide as much personal experience as possible, because that way I can at least tell you which has worked best for me, possibly saving people from making decisions that have dragged me down.  I get a lot of joy from helping others!  :thumbup:


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Cannabis, Marijuana, Ganja & Greens >> Cannabis Cultivation

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