This is unbelievable. According to the Stoney Girls seeds website they have a sativa strain that finishes in 28 days of flower! I call BS!
Copied from their site:
Berkeley is some kid’s science project from Berkeley University, or so the legend goes. She is the fastest finisher I have and she produces incredible amounts of sugar. Outside she will get 14 feet tall with an eight foot diameter. Even the fan leaves and stems grow crystals. The high is a speedy, up type high. Don’t try to take a nap on this, and expect anxiety attacks if your hyper. Very good early but comes with a “warning” label for its rib breaking expansion characteristics. With this breed you can really get some stuff done. We use this strain to speed up slow, long varieties in our breeding program. It finishes in a whopping 28 days of bloom cycle. It is a South American sativa based land race plant.