Abstract. The ontogenetic and bioecological evaluation of senescent populations of rare and endangered plant species in the Republic is of significant importance for the conservation of wild flora. This article is dedicated to an in-depth examination of the bioecology of Juniperus foetidissima Willd. This particular species is noteworthy, as it has been included in the Red Book of Azerbaijan due to its threatened status. The study encompasses various aspects of the species’ life cycle, habitat requirements, reproductive patterns, and interactions with the surrounding ecosystem. By understanding these factors, we aim to promote effective conservation strategies and raise awareness about the importance of protecting this rare species in its native environment. Additionally, this research could provide insights that are applicable to other endangered species within the region, ensuring a broader impact on biodiversity conservation efforts. The Juniperus foetidissima Willd. is an important part of the arid sparse forests in Azerbaijan, characterized by their unique dual nature. Some groups of plants in these forests rely on the essential qualities of the tree layer, while others form independent associations.