Smoothstem blackberry variety
Old and proven very vigorous high-productive trailing blackberry cultivar
Rubus subgenus Rubus Watson 'Smoothstem'
Originated from a cross of Merton Thornless x Eldorado
Variety denomination - 'Smoothstem'
Plants are thornless
Bushes have trailing canes
Fruit weight is 7 g
Berries have a conical shape
Fruiting habit - floricane fruiting (summer-bearing)
Flowering on floricanes starts in the second week of June
Ripening date (regular) - fourth week of July
Productivity is 20 kg per plant
Cold hardiness is excellent
Heat tolerance is low
Country of origin - United States
Current status - obsolete or rarely used
Recommended replacement - Columbia Sunrise
Pests and disease resistance are normal, winter hardiness is excellent, up to minus 23 C. Smoothstem doesn't give good yield in shadow areas, but plants are sensitive to high summer temperatures, laterals with fruit can shrink, so bushes need to be sheltered from direct sun rays.
Useful Growing Guides:
Berry Soil and Nutrient Management – A Guide for Educators and Growers. M. Pritts, C. Heidenreich, L. McDermott, and J. Miller; Cornell University, Ithaca, NY
High Tunnel Raspberries and Blackberries. AJ Both, Kathy Demchak, Eric Hanson, Cathy Heidenreich, Greg Loeb, Laura McDermott, Marvin Pritts, and Courtney Weber; Cornell Cooperative Extension
Raspberry and Blackberry Production Guide. L. Bushway, M. Pritts, D. Handley; Natural Resource, Agriculture, and Engineering Service Cooperative Extension, Ithaca