I am new at this. I have blackberry sprouts that I planted about 3 years ago. I did not know to keep track of which sprouts grew berries this year and the deer got most of the berries anyway. Some of these sprouts are 8 foot or longer at the moment and growing into my other garden space, so I would like to trim them back; however, some of these sprouts I know did not yield berries this year. Can I cut them back to ground anyway without harming the over all sprouts? Any advice regarding trimming and caring for the black berry sprouts would be most helpful.