"The Utrecht University Botanic Gardens have a unique archive of seed lists: records depicting and describing plants that have grown in the garden at a set point in time. Seed lists are offered for exchange between botanic gardens worldwide, and Utrecht’s archive dates back to 1837. It consists of more than twenty thousand seed lists from hundreds of different botanic gardens – each showcasing hundreds of entries."
https://www.uu.nl/en/news/historical-seed-lists-teach-researchers-about-plant-collections-of-the-past