Buy Happy Valley | Grandpas Cookies #5 | Flower (H). Grandpas Cookies is a hybrid weed strain made from a genetic cross between Grandpa’s Stash and Ethos Cookies. This strain is 50% sativa and 50% indica. Grandpas Cookies has a complex and enticing flavor profile that combines the skunk, pine, and tobacco notes of its parents with hints of cream and citrus.