Shepherd, Lizz. The Complete Guide to Growing Vegetables, Flowers, Fruits, and Herbs from Containers. Page 127. Retrieved on 6 Oct. 2023. "Rosemary seeds can be hard to start, with a slow germinating time and a low germination rate, which means many seeds do not develop into plants."
Federal Register. Volume 52, Issues 13-20 - Page 2228. Retrieved on 6 Oct. 2023. "Mature rosemary approaches senescence at an age of 30-35 years…it releases toxic chemicals into the soil that inhibit or prevent the growth of most other plants, resulting in areas of relatively bare, open sand between the shrubs."
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Vallverdú-Queralt, Anna; Regueiro, Jorge; Martínez-Huélamo, Miriam; Rinaldi Alvarenga, José Fernando; Leal, Leonel Neto; Lamuela-Raventos, Rosa M. (2014). "A comprehensive study on the phenolic profile of widely used culinary herbs and spices: Rosemary, thyme, oregano, cinnamon, cumin and bay". Food Chemistry. 154: 299–307. doi:10.1016/j.foodchem.2013.12.106. PMID24518346.