Juniperus grandis (Sierra juniper) is a shrub or tree native to California, United States. A medium-sized tree 12-26 m tall with a stout trunk up to 3 m diameter. Cones 5-9 mm diameter. Most plants dioecious, but about 5-10% are monoecious. A medium-sized tree 12-26 m tall with a stout trunk up to 3 m diameter. Cones 5-9 mm diameter. Most plants dioecious, but about 5-10% are monoecious. Synonyms: Juniperus occidentalis var. australisHabitat. Exposed, dry, rocky slopes, flats, forest, pinyon/juniper woodland; 100-3100 m. High North Coast Ranges, High Sierra Nevada, San Gabriel Mountains, San Bernardino Mountains, East of Sierra Nevada, Desert Mountains; western Nevada.