There are four different types of Iberis. The one that is common here is sempervirens. It is evergreen and blooms in early spring. Sometimes you can get a second bloom if you trim it back a bit after it is done blooming.
Perennial and annuals
Zones 1-24-check the tag
Full sun or partial shade
Iberis sempervirens is a perennial. It grows to 8-12 inches high and spreads about the same, farther if you let it, but then it is leggy. Best to trim back a bit to keep if full and bushy.
It has narrow shiny dark green leaves that are evergreen. And the blooms are adorable!! Look how awesome they are close up!! I Love this plant!!!
I am planning on putting several more in the garden this year!! Evergreen is so special in the perennial bed!!
Take care everyone, Happy Gardening and keep those tools clean!! Martha