I agree that randomness might be a bit better here, or if you could do something like randomize destination (idk didn't sign up).
That way you can send flowers to the significant someone at home one month, the office the next, or something like that.
If you randomized the date of delivery you could do something like a small thing of flowers one week but 5 weeks later a slightly larger arrangement. Along the lines of something I'm thinking of: xkcd/576 and the associated implementation that was posted on hacker news. It doesn't buy something everyday, but sometimes saves up.
But that's complicated! And you have an MVP which is exactly that, minimum. I like it a lot; I'm just not quite in the $49/month club for flowers yet.