noun
vase
VAYS/veɪs/
A decorative container usually used to hold flowers.
Fresh flowers stand in a ceramic vase.

Etymology
Latin vas named a container generally, rather than specifically a flower holder. The selected meaning narrows that broad vessel idea to a decorative container used for flowers.
In context
they'll last for about a week in a vase if you are using them for edible purposes you'll want to wait till the flowers all the way open