A hybrid, Sour Grape is a relatively popular name for cannabis crosses involving Sour Diesel and grape-flavored or purple-colored parents. One of the most widely circulated varieties of Sour Grape, however, is the product of Sour Diesel and the heavily sedative Grandaddy Purple. Well-balanced between mental and physical effects, this Sour Grape is a great way to enhance a variety of activities, both social and intimate. Cannabis testing lab Analytical 360 has measured this strain’s potency at between 14% and a staggering 24%.