A study in the UK found very large biodiversity at solar parks with vegetation:
"Overall, they observed 1,397 pollinators across at least 30 species."
"According to the study, solar parks were especially beneficial to pollinators in areas with disconnected landscapes. The authors noted that this could be because areas with well-connected landscapes rich in hedgerows and trees could be more attractive to pollinators because they offer a wider range of resources. "