M-39 made the High Times Magazine list of Top 10 Canadian Strains of All Time in 2013. Nevertheless, it is often thought of as a lesser potent strain because for many years it has been used as a commercial strain to produce large and easy-to-grow yields that do not focus on quality or even THC. In Canada, this strain has often been available as the cheap commercial marijuana referred to as "Beasters." Originally bred by the Super Sativa Seeds Club, M-39 was listed as a cross of Basic #5 and Skunk #1. Now, however, it is widely believed that Basic #5 was actually Northern Lights #5, which would make the strain of the same genetics as Sensi Seed's Shiva Skunk.
Happy and relaxing, properly grown M-39 can be good for a lazy day or afternoon. The strain may eventually put users to sleep, but not before stimulating their appetites. Some users find the strain motivates them; the effect that can be used to fight fatigue. The strain may also relieve nausea, stress, and anxiety. It is also used for the treatment of glaucoma. M-39 may cause headaches.
Like many Indica-dominant strains, M-39 is very easy to grow because it is resistant to mold and is short and easy to trim. It is great for an indoor grow because of its weak odor and an eight to nine week flowering period. Unfortunately, M-39 is a clone-only strain.