6″ Rosemary Tree
To keep rosemary happy, give it six to eight hours of full sunlight each day. When growing it indoors, place it in a south-facing window for bright light, but don’t let it get too hot.
Grow rosemary in sandy, well-draining soil. This plant is native to the rocky hillsides of the Mediterranean and doesn’t do well if its roots stay wet.
Water rosemary plants when the soil is completely dry. Be careful not to over-water and avoid making the soil soggy (especially when growing in containers), as this leads to root rot.
Outdoors, rosemary can tolerate high temperatures and a wide range of humidity. Most varieties are hardy only down to 30 degrees Fahrenheit. Where temperatures dip below 30 degrees, rosemary plants will have to spend the winter indoors. In this case, it’s easier to grow your rosemary in a container all year. Since rosemary likes it on the dry side, terra cotta pots are an especially good choice. Just be sure the plants don’t bake and completely dry out while outdoors during the summer.
Rosemary is not a heavy feeder, but fertilizing in spring with a fish/kelp emulsion will get it off to a good start for the season. Periodic foliar sprays with the emulsion will keep it looking great.