 Such varieties, which are grown only in Oak Glen, as well as many heirloom varieties no longer commercially available or are hard to find, such as the Arkansas Black and the Glen Seedling favorites among many.According to the Los Angeles Times, the town in Tamara Thorne's horror novel "Moonfall" is based on Oak Glen.According to the United States Census Bureau, the CDP covers an area of 15.1 square miles (39.2 km²), 99.97% of it land, and 0.03% of it water.