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.
1 Plant it in a location where it will receive plenty of sunlight; rosemary flourises in the sun. Be sure it doesnât overheat in hot summer weather.  Water it occasionally, but be sure not to over-water it; the plant doesnât require a lot of water for growth. Allow the soil to dry in between watering the plant.