- (Morus alba x rubra) Very cold hardy withstanding -25f, Illinois Everbearing grows to 35 ft. but can be kept smaller with pruning. Very precocious, it often starts producing the first year after planting. They bear sweet, highly flavored fruit, 1-1/2 inches long x 1/2 inch wide that look like long blackberries. Unlike other varieties they ripen continuously from mid to late summer, which gives it the Everbearing name. The fruit is red and turns black when fully ripe and ready to eat.