The vast market of ornamental plants and flowers generates a large amount of wastes, from where fibers can be extracted. The mechanical properties of these fibers have not yet been reported. Therefore, the possibility of using them as fiber-reinforcement in polymer matrix composites is an open question. In this work the tensile mechanical properties of fibers obtained from the stem of three types of ornamental plants–Etlingera elatior, Costus comosus and Heliconia bihai–are evaluated and compared to the tensile properties of other lignocellulosic fibers. Besides, the tensile strength of the fibers is discussed in terms of the Weibull statistical distribution. E. elatior showed high values for both Young’s modulus and tensile strength, comparable to the properties of fibers with already large use, such as jute. Therefore, fibers extracted from the stem of this ornamental plant are potential candidates to be used as reinforcement in polymer matrix composites. C. comosus and H. bihai on the other hand are low modulus fibers, and their use in composites will be restricted as fillers, reducing cost but not enhancing mechanical properties.