Nature-based solutions are claimed to offer an effective approach to tackle societal challenges and promote biodiversity. While research has mainly focused on biodiversity and material ecosystem services, non-material contributions and relational values of urban green spaces remain underexplored. How to balance the benefits of nature, well-being, and relational values in their design and performance evaluation remains unclear. To elicit the values expressed in public communication regarding the benefits of urban nature projects in Flanders, three online repositories that feature diverse nature-based solutions projects in the region were chosen. Using coding and quantitative content analysis of standardized descriptions from these repositories, this study found that relational values were most abundant (55%), followed by instrumental values (30%) and intrinsic values (15%), consistently so over socio-demographic and physical contexts. It was also discovered that larger projects have a higher level of multifunctionality, which is calculated based on the variety of values and value dimensions expressed, and that participation—although considered key—rarely reports on inclusivity. The findings suggest that in Flanders, a greater emphasis is placed on relational values associated with urban nature. A broader value scope for the design, management, and evaluation of urban green spaces tailored to the local context is recommended.