Feminized marijuana seeds Feminized cannabis seeds are genetically modified to produce only female plants. Usually, a cannabis seed will produce a male or female plant; the entire process is determined by the X and Y chromosomes. A plant with two X chromosomes will be female 99.99% of the time, while a cannabis plant with X and Y chromosomes will almost always become a male plant. Royal Queen Seeds has managed to ensure that its female plants produce male flowers thanks to a treatment using gibberellic acid, which transforms female plants into hermaphrodites and makes it possible to produce seeds with only female chromosomes.

http://www.royalqueenseeds.com/36-medicinale-cannabis-seeds

Auto-flowering marijuana seeds Auto-flowering cannabis seeds are seeds that flower on their own in 2-4 weeks. In order to flower, the normal feminized Indica and Sativa species must be exposed to inside lighting for 12 hours directly after harvest. They wouldn’t bloom outdoors, because the daylight hours diminish during this season. Auto-flowering species are Indica or Sativa plants crossbred with Ruderalis, a type of cannabis that grows in areas where summer is very short but has many hours of daylight, from 22 to 24 per day. Ruderalis flowers automatically in a very short period (generally from 2 to 4 weeks).