This study explores the propagation of Frangula sphaerosperma, a species relevant for ecological restoration, by characterizing its seed and biometric traits (length, width, and shape indices) and evaluating germination at 20, 25, 30 and 35 °C. Germination percentage, germination speed index, average germination time, and seedling normality (defined by the presence of essential structures, such as well-formed roots and expanded leaves) were assessed. Seed traits were obtained using image-based measurements with ImageJ®. Seeds showed low moisture content (10.8%) and were classified as small and circular, with a thousand-seed weight of 20.04 g, corresponding to 49,888 seeds kg-1. Germination was similar between 20 and 30 °C (27.3- 33.8%); however, 25 °C optimized seedling quality, providing the highest percentage of normal seedlings (12%) and the shortest average germination time (11 days). Temperatures above 30 °C reduced germination and seedling formation, indicating sensitivity to heat stress and supporting nursery production at 25 °C.