with sweet seeds breeders just use an auto in their breeding and it knocks a week or two off the time from a photoperiod time variety's....look at www.sweetseeds.com ..mac,
They are developed by crossing a slightly dependent strain with a ruderalis strain. As with other crosses, the process takes longer, as deciding on the compatible strains to cross months and even years. This cross results in a strain tagged as F1, which flowers fast but has an entirely unique DNA composition, so it is not categorized under automatic flowering strains. As for regular or standard cannabis strains, it usually takes around eight weeks to 7 months before results are seen. With the development of fast version strains, around 1 to 2 weeks are shaved off from the standard wait time. It is truly a revolution in the world of cannabis. Aside from beating regular strains in the rapid flowering aspect, these strains are also faster than ruderalis. Growers were happy with the introduction of ruderalis strains, but most are put off by the amount of yield, an aspect fast version cannabis can fill in. What are Fast Version Cannabis Plants
They aim for faster harvests without sacrificing quality. Perfect if you're looking to speed up your grow cycle. Last time i tried Sugar Black Rose Early Version by Delicious seeds when Herbies had promo. She grew perfect buds in 7 weeks