If you look closely, you will see more and more creatures in the garden. And often certain insects are bound to a certain family of flower species. In this way you will soon have dozens of species, each with their preferences. In the summer I read the booklet Mijn 1000 soorten tuin. The biologist tries to determine 1000 species in a year in his garden of 200 m2, including the sky that he sees. He came to 1518 species. 400 moths requires a biologist I think, but it shows how many species there are in gardens.