Is there a specific culture lawns originated in? Who decided it was fashionable and/or necessary? How did the standard types of lawn grass today come into vogue?
our own /u/caffarelli attempted to answer this question a few years ago: https://www.reddit.com/r/AskHistorians/comments/1ea2jh/when_did_trimmedlawns_become_a_popular_thing/c9yajxe/
There have been some other threads about it, but most of them are so old they don't meet the current standards for a top level answer. Also, caff is kinda our resident lawn-care expert, on top of her many many other fields of expertise.