Hope this may help some of you.

I haven't ever heard of a way to tell from seed. I think if there were one people wouldn't bother with any other method.
So that is unfortunate, I think you can get feminized seeds if you are in some places.
 
Anyone know how they get a plant to produce only female seeds?

Gibberilic acid doesn't feminize the seeds, I think it only encourages them to germinate.

Use Gibberellic Acid on one branch of a female plant to induce male flowers. Gibberellic Acid is sold by nursery supply houses for plant breeding and hybridizing. Spray the plant once every day for 10 days with 100 ppm gibberellic acid. When the male flowers form, pollinate the flowers of your other target female plant you have selected. Just pollinate one branch unless you want lots of seeds!

Once the branch has male flowers, cut the branch and root it in water, with glass under it to catch the male pollen when it drops. Use a rooting solution similar to the above cloning solution.Collect the pollen with a plastic bag over the branch and shake it. Use a razor blade to scrap up fallen pollen and add it to the bag too.

mmm i read somewhere that you can chemically wash the seeds to feminize them. i shall see if i can find the ref.

Female seeds are easy to buy. Most places sell mostly female seeds. Almost any weed place that sells seeds sells a bunch of females. I'd never mess with mixed seeds, only females..... Btw, rollitup.org is really the best place to find this info.

^^^ Most places do but they are still easy to get. It's not like having coca leaves from Peru sent to you. Weed seeds are just no big deal even with them being illegal.

Geez so many Aussies on all these forums. Like everyone I know on these forums is from Oz. You guys sure must like your drugs. I always assume people are just from the US and they never are. That goes for everything too. Like I took a look at the top selling albums of all time the other day and I was surprised how everyone I thought were American were all either Aussies, British, or Canadians. I can't believe all these years I never knew AC/DC were Aussies!

While this may be a bit off topic, swim knows of some growers who successfully ordered seeds and got them last year, in the US.

Glue is in the process of ordering some seeds now, he will report back with the results.

Please PM Glue if any nym KNOWS the seed banks that can be TRUSTED.  Glue is down to only one source that he KNOWS is trustworthy.

Great photos 666!!!
   It has been noted that not only do the male flowers tend to appear before the females, they can mature and open VERY rapidly, particularly in hydroponic systems..male flowers can form and open in 24hrs!!! so it is important to keep a close eye on the plants when they are flowering....

  All cannabis plants have the potential to become hermaphrodites....when a group of 40 hydroponically grown plants flowering was induced by cutting the light back from 18hrs per day, to 10hrs,, 16 plants became male within 72hrs

    They were removed (sexist farming!) and the photoperiod increased to 12hrs a day......within a week ALL the remaining plants became hermaphrodite!!! 

  The lesson learned was NEVER increase the photoperiod from what it was, when flowering is induced..e.g. If you have your plants on a  20hrs grow cycle, reduce it to 12 to induce flowering, and LEAVE IT at 12 hrs, DO NOT increase it, even by 30mins or you will get hermaphrodites..trying to get plants to have photoperiods (leaving the lights on) for more than 12hrs when flowering is asking for strange results

   Some growers have been known to start their plants on a 24hour cycle to begin!! yep, continious light for 2-3weeks and then induce flowering...I have no idea what results this produces but it is an interesting idea

  It was found with indoor crops, to induce flowering when the plants are <40cm high, as they continue to grow in height as they flower, probably due to the optimum conditions provided....

   The BEST THING YOU CAN DO to increase flower size and quantity, is to provide them with a  red/yellow light source such as a HPS (High pressure sodium vapor) light, like the yellow street lights...the grrrrls will go ballistic!!!