Cautions. Any risk factor for hemorrhage (eg, subacute bacterial endocarditis, blood dyscrasias, menorrhagia, dissecting aneurysm, major surgery, spinal anesthesia, hemophilia, GI ulcerative lesions, liver disease, impaired hemostasis).
How to Grow Rosemary â Harvesting. You can start to harvest your rosemary when it is 4 to 6 inches tall. However, do not prune it excessively until it is at least 8 to 10 inches tall. You can use rosemary directly out of your garden to add fresh seasoning to almost any dish.
Nursery plant - 3 months. Cuttings - 1 year. Seed - 15 months. Rosemary is one of the most decorative herbs and is well worth growing for its appearance alone. Dependent on the variety, it has small, profuse flowers appearing in late spring which range from dark blue through pale blue right down to white.