Why didn't Mr. Wilson, ya know, FILM the plant flower blooming?
First of all, how would they know the exact moment (or even the exact day, week or month for that matter) the plant would actually bloom? lol.
Being such an important and once in a lifetime thing, you'd think George & Martha would think to film it or at least have someone else at the party document it. VHS camcorders were very common by the early 90s, so even if the Wilsons weren't really hip on (at the time) modern technology, it was commonplace enough that someone should've definitely had one. Or at the very least, they could've taken pictures.
This was 1993, not 1963 lol.