One gift idea could be adopting a beehive in his name. There are many conservation organizations that offer this service where you can sponsor a hive and receive updates on its progress, honey produced, and how it's aiding in bee conservation efforts. Another idea could be booking a beekeeping class or tour of a local apiary for the two of you to attend together. You could also look into purchasing some handmade bee products such as beeswax candles, wildflower honey, or honeycomb soap. Additionally, you could make a donation to a bee conservation organization in his honor or gift him a book on the subject.
Or you can get him a star map with the date of your anniversary.
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.