How about the book "The Bee-Friendly Garden: Design an Abundant, Flower-Filled Yard that Nurtures Bees and Supports Biodiversity" by Kate Frey and Gretchen LeBuhn? It's a great guide for creating a bee-friendly garden and she/he could learn more about it. You could also pair it with a packet of wildflower seeds that attract bees. Another idea is to get a cute bee house or bee hotel that they can hang in their garden to encourage bee nesting.
Or you can get her/him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.