Granddaddy Purple a cross of Purple Urkel with Big Bud California loves its purple cultivars and GDP is a staple in classic purple cultivars. Created almost 20 years ago in San Francisco Granddaddy Purple has been a solid choice for smokers far and wide. Almost identical to its cousin Grape Ape GDP has an overwhelming grape-ness to it with a spicy earthy undertone. A powerful cultivar GDP hits the body and mind equally relaxing euphoric and mildly sedative.