I very much like having vases filled in the house but I’m always wondering what cut flowers last the longest. I’ve had really great experience with simple greenery that sticks around for months, but sometimes you want a little color.
These hydrangea have held up okay enough (though I do realize they’re not very colorful). I change the water and cut a little bit off the stems every few days to keep them happy.
Alstroemeria seem to go on for a good piece.
So do Lillies (I’m quick to pinch off the anther parts of the stamen as they open to keep things tidy).
In addition to these, some cursory searches suggest Chrysanthemums, Orchids, Carnations and Leucadendron top many lists for longevity. Making mental note for next time.