GRANDDADDY PURPLE One of the most famous strains, Granddaddy Purple, Granddaddy Purp, or GDP is a berry-flavoured, purple-hued treat dusted in white crystals. Bred from Purple Urkle and Big Bud, this hybrid is a favourite for those looking for strong effects from both the indica and sativa sides after all, GDP is notorious for its ability to simultaneously relax the body into couch lock and launch the head into the clouds!