VanitasFan26
I'm just a ghost.
I can back this up on my main island (Destiny) I have the flowers planted in square like areas on the right side of the island and what I did was make sure to cover all of the grass patterns with custom blue brick patterns that I used so it doesn't cause the flowers to grow out of control. I also use custom grass patterns as like "Fake grass" so there are flowers there but they don't breed all over the place.Its not 3 hours.
That was the time frame to do the whole island without flowers covering up any tiles.
The other time given was if you had flowers in every other tile across the whole map meaning the absolute maximum amount that a person could ever have to do if for some reason they designed their island to just be a grid of flowers.
Realistically a player would spend no more than 30 minutes to do this.
Probably less.
And this process stops flowers breeding in areas you don't want them, so is better in the long run than being able to just kill flowers.
I will be real and say this took me like 3 hours to do it was back when I was still making this year after deleting my old one.