Botanical name: Acorus gramineus var. variegatus
Common name: Sweet Flag
Family: Acoraceae
Origin: Japan
USDA Plant Hardiness Zone Map
The plants are evergreen in warmer climates, but they will die back to ground level in colder climates. Although they are water lovers, this species can take quite a bit of drought. I have seen this plant used as an accent in dry rock gardens.
Link to this plant:
https://toptropicals.com/catalog/uid/acorus_gramineus_variegatus.htm