It took some time before I understood that rosemary can grow this large in Seattle because of the mild winters here. After I had plants die in successive years in Chicago, I looked up its cold tolerance and said, “Oh.” I had assumed that since it’s a woody mint, it would tolerate freezing temperatures like sage and lavender.
I’d always read to take rosemary inside under 20°F but still had trouble keeping them alive overwinter because of Missoula’s lack of sun. Blew my mind the first time I saw a bush growing like this in New Orleans.
Here in Southern California, rosemary is often used as a hedgerow plant. It grows big and fast in the right conditions.