Critical Mass Marijuana Strain UK is a potent indica marijuana strain made by crossing Afghani and Skunk #1. In small doses, this strain will have you feeling creative and calm. In large doses, you’ll likely find yourself feeling sleepy and in a couchlock. Critical mass gets its name because of its ability to reach “critical mass” in terms of growth. When growing, branches of this strain tend to snap off from the heavy weight of its buds – which are dense, heavy, and tasty. The downside of Critical Mass is that this strain is particularly susceptible to mold, so growers have to be extra cautious with humidity. Flowering time for Critical Mass is approximately 6-8 weeks. This strain originated from the breeder Mr. Nice Seed Bank.