For erect blackberry cultivars, such as Cherokee, Cheyenne and Shawnee, thin the canes that are in their fruitless first year of growth, called primocanes, in late winter, when the plants are dormant. For trailing blackberry cultivars, such as Boysen, Chester, Logan, Marion, Silvan and Tayberry, thin the primocanes when harvest time is over.
About this Author
Janet Teas has worked in the publishing industry since 1993. She is an avid gardener and decorator who has written numerous home and garden articles for websites and magazines such as "Better Homes & Gardens," "Hometown Cooking," "Country Woman" and "The Essential Herbal" magazine. She received a Bachelor of Music in music education from Bowling Green State University.