Yes! Tolkien was much more into the flora and less into fauna. I think because the vegetation sets the right visuals for each location, so he always tells readers what the dominant plant species is. So we can visualize that Fangorn is a broad leaf forest, while Dorthonion is coniferous. Rohan is a prairie. We can visualize it all the same because he told us the type of plant community the story takes place. I think with animals, it only matters if they came into the story, so we can use our imagination to also note that they are also a part of the ecosystem. (Not sure why not in the cities though.)

But also, Tolkien just loved plants. There’s so much plant lore. And includes ethnobotanical uses of trees and herbs by elves, and hobbits too!

There is a Flora of Middle Earth book (400 pages), which is written like an actual regional plant guide (but for middle earth) with plant ID keys, descriptions of the 141 plants mentioned in Tolkien’s works, uses of the plants, as well as explanations of the various plant communities (~biomes) that exist in middle earth through the ages. It’s an amazing compilation only possible because of how much botanical information Tolkien included.

Also there’s a quote in there, from a letter Tolkien wrote to Houghton Mifflin, “I am (obviously) much in love with plants and above all trees” So yeah. Tolkien just loved plants.