FuelCann Grape Stomper Grape Stomper is a sativa pre-roll pack containing 10-pack of 0.5g. Grape Stomper, more commonly known as "Sour Grapes" was created by Gage Green Seeds. A complex cross between breeder JojoRizo’s Purple Elephant and breeder Elite Seeds’ Chemdawg Sour Diesel, Grape Stomper has quite the pedigree.