I am using a hydro setup and understand that using gibberellic acid will force my females to become hermies. My question is how much gibberellic aid to apply and where? Do I spray it on the plants and if so what is the mixture and how much and how often. My second question is if have a hermie and it pollinates a pure female will the pure female produce feminshed seeds? Thanks in advance for the advice.

As I understand it Gibberellin increases trichome production, especially when used in conjunction with Jasmonic acid, you might want to check out my thread "New natural pest control" here

The second link I posted and the one from Seamaiden should interest you, would you mind telling where you got it and how much?

I haven't used them myself (yet) but would be very interested in how this works out for you. I hope it's worth every cent 'cos if it costs as much as Jasmonic acid($14-20 per mg) it would need to be!
Don't know if this is any help to you, what type have you got? If that's no use then just Google "Gibberellic acid Cannabis" for more info, it would seem that you use it in a foliar spray.

Mr. J,

Thanks for the reply. To be honest I haven't even looked for Gibberllic Acid but figured I would find it somewhere if I can get confirmation that someone has used it with success. I went out and read the post and found that the information was useful but didn't really answer my question. The search continues.

Prices

Gibberellic acid FAQ

"36. What Are The Effects Of Applying Gibberellic Acid On Tomato Plants Before Transplanting?

One study 1 concluded that 10 days before transplanting tomatoes should be supplied with 60 PPM of gibberellic acid.

37. What Are The Effects Of Applying Gibberellic Acid On Tomato Plants When Transplanting?

One study 1 concluded that a spray of 50 PPM of gibberellic acid when the tomato plant was transplanted outdoors increased yield by 40%."

Seems you apply once at any or preferably each stage of the plants life starting from seed (it was used to germinate 2000 year old seeds!)

Doseage Calculator

This should answer your second question I think.

Mr. J

Thanks for the help. I am trying to come up with a method of creating feminized seeds. I don't have the room to make clones and was looking for an alternative to buying feminized seeds. That does answer my second question. Thank you!

It'd be easiest to make collidial silver, actually ionic silver. All you need is water, some silver and a battery.

Ontariogrower has a thread going testing gibbellic vs collidial and the collidial started to herm after a little more than a week.

This IS how you make feminized seed, but in order to have a good chance of the offspring not having hermie traits, it should be difficult to herm, or resistant to having the herm traits. If your plant herms just from a high pH or other reason, the seeds will most likely carry the herm trait.

Look up ontariogrower, he should be able to help.

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I had good luck with CS. Here's the thread MrHowardMarks is talking about.

femizing help

Some good info posted in that thread. I am in the middle of my CS experiment now. I have seeds ready to plant. Plan on doing that in the next couple of weeks. You are right though. You want a plant that resists that hermi trait. You don't want a plant that is easy to turn or you will have a crop full of plants that will turn hermi at the first sign of stress or just turn hermi right of the bat.

Thank you everyone for your insight. This has been very helpful.

Great thread. The only thing it doesn't mention is how much water to use. I would think that would be pretty important since the amount of water will determine the weakness or strength of the solution.