The ‘Navaho’ is a mid to late summer ripening blackberry. It is a very productive blackberry with white flowers in the spring. It has 1” blue to black berries that are exceptionally sweet. The ‘Navaho’ is an upright, thornless blackberry. It fruits once a year, making it a floricane. It tolerates both heat and clay soils. It also attracts pollinators. Height: 4'-6', but can be kept smaller with some pruning. Minimum temperature: Hardy to -10ºf to -20ºf. USDA zone: 5-8. Find your zone here. Light: Full sun to part sun. Bearing age: 1-2 years. 10-15 lbs per plant. Growth Habit: Erect floricanes. Cane Type: Thornless. Water/soil: Average to fertile, moist, well drained soil Pollination requirements: None. It is self fertile but will do better with another type nearby. Ripens: Mid summer through September.