- Apache is an erect, thornless blackberry bush released by the University of Arkansas. It produces higher yields and larger fruit than the other thornless cultivars, 'Arapaho' and 'Navaho'. 'Apache' produces a 10 g berry, which is the largest of the three thornless cultivars. Berries are conical in shape with a glossy black finish. Canes of Apache Thornless Blackberry are more erect than other thornless varieties and can be grown without a trellis when primocanes are tipped at 42" to control length and encourage lateral shoot growth.