Ultra Sour is the product of crossing MK Ultra and East Coast Sour Diesel. Ultra Sour is said to be a 70% sativa leaning hybrid and may top out at 20% THC levels. This strain does not provide significant CBD amounts. Ultra Sour is a mind-focusing and mentally invigorating sativa. Expect to knock out your list of things to do quicker than expected. Ultra Sour tastes of supremely sour lemons and dank diesel.