I'm in zone 6, Cincinnati. I have had a rosemary plant in the ground for 3 years now. It is in a river rock bed. In the winter I cut it back by a third and then stack stone around it, about 5" tall. Then I put leaf mulch in and around the rosemary. I've had very good success.
I'm in zone 6, Cincinnati. I have had a rosemary plant in the ground for 3 years now. It is in a river rock bed. In the winter I cut it back by a third and then stack stone around it, about 5" tall. Then I put leaf mulch in and around the rosemary. I've had very good success.