Growing the sweetest red raspberries (Rubus spp.) can be a challenge, as there are many varieties to choose from. While flavor is important, you also need to consider climate and fruiting pattern. Summer-producing varieties will grow one year and produce the next year, while fall-producing varieties will produce fruit on the current season's growth. Both varieties offer various sweet raspberries, most of which prefer a cool climate. (See References 1) Autumn Bliss Raspberries "Autumn Bliss" is an early season fall raspberry that is hardy to U.S. Department of Agriculture plant hardiness zones 5 through 9. Recommended by the University of California, this raspberry variety originated in England in 1984 and produces short stems with few thorns. The shrub develops pink flowers which are followed by large, juicy, sweet berries that are exceptionally tasty. The berries are dark red and tend to turn darker when stored in the refrigerator. (See References 1 to 5) Heritage Raspberries “Heritage” is a fall red raspberry variety that is also recommended...