Growing the sweetest red raspberries (Rubus spp.) can be challenging, because there are many varieties to choose from. Although flavor is important, you must also take the climate and fruiting habit into consideration. Summer-bearing varieties will grow one year and produce the next, while fall-bearing varieties produce fruit on the current season's growth. Both varieties have various sweet raspberries to choose from, most of which prefer a cool climate. (See References 1) Autumn Bliss Raspberries