Granddaddy Purple is an indica marijuana strain that goes by many different names, Popularized in 2003 by Ken Estes, Granddaddy Purple (or GDP) is a famous indica cross of Mendo Purps, Skunk, and Afghanistan. This California staple inherits a complex grape and berry aroma from its Mendo Purps and Afghanistan parent, while Skunk passes on its oversized, compact bud structure.