I have no botany training and after coming up with this question many years ago, I am now finally daring to ask it

in public.I have noticed over the years that certain varieties of cut flowers keep flowering MUCH longer than other varieties in the same arrangement. I am thinking of alstromaeria, daisies, hypericum berries.Is there a known reason for this?a particular vascular system or stem makeup, place of origin?

I know this could be a "Why is There Air?" type question but I am secretly holding out hope for an answer.

Th much for your help/tolerance with this one!

best,

mindy