Because somebody cut that tulip. And took it away with them.
Actually, this happens every year, and I forget about it until it happens again. I spend about one day nearly homicidal over it, then that recedes into annoyance and resignation. And then I forget. I know all my neighbors in this building — if any of them did it, it would be from ignorance. I’ll ask them as I see them, so if they did they will know they shouldn’t do it again. I plant stuff out front for me and everyone else to enjoy, not for some one person to take and enjoy all by themselves where no one else can see. Grr. I don’t mind a bit of harvesting on the herbs out there. One can’t very well expect not to share those, and I would like to share them, actually. Just don’t mow them down completely, please, neighbors. But what kind of cretin cuts a flower that isn’t theirs?