The earliest evidence of human exploitation of the wild date palm in the Middle East dates back to the sixth and fifth millennia BCE. Despite the scarcity of archaeological data, it is commonly assumed that by the end of the Late Uruk period (ca. 3300–3100 BCE), the Sumerians founded the earliest date palm orchards. However, this hypothesis has thus far not been substantiated by scientifically verified and documented evidence, rendering the matter a subject of scholarly controversy. To date, since the Proto-Elamite script has not yet been fully deciphered, our knowledge of agricultural activities within Proto-Elamite society remains considerably limited. What has been learned so far regarding the structure of this society’s economic system is derived mainly from comparisons between signs found on Proto-Elamite clay tablets and comparable examples in Late Uruk Mesopotamian Proto-cuneiform tablets from the late fourth millennium BCE; signs that primarily pertain to labor activities, animal husbandry, and livestock products. This study outlines the phenotypic characteristics of the date palm that can be identified, and examines their similarities to known Proto-Elamite examples. The authors suggest signs representing date palms in the Proto-Elamite script and consider them as key resources for a better understanding of the subsistence economy of the Proto-Elamite period, an issue previously absent from the scholarly literature on this era. Employing a comparative approach, the article correlates the signs for palms in Proto-Elamite texts with contemporaneous and later Iranian, as well as Mesopotamian, visual motifs. By introducing these signs into the archaeological discourse of the Proto-Elamite period, the research enables a more accurate reconstruction of the economic system and assessment of the level of date-palm horticultural knowledge in southwestern Iran during the late fourth millennium BCE.