I give you Iberis (Candytuft) ‘Snowflake’:

This super reliable and evergreen plant starts to show signs of new life in late winter, here in zone 6B:

The buds start to form soon after:

And before you know it, the plant is covered in clusters of flat, sparkling white flowers in mid to late April:

These blooms shine in the evening and would fit perfectly in a moon garden. I have two of them at the foot of my front steps so I can enjoy them each night.

The flowers last a good three weeks for me before they are spent:

And then I’ll cut them back by a 1/3 to a 1/2 and the needle-like foliage will look clean throughout the remainder of the year:

Some other bits of info:

• Typical size is about 1′ x 2′
• Prefers full sun but works in partial shade for me 
• Most commonly used in rock gardens and as an evergreen groundcover
• Prefers hot and dry conditions and well draining soil (still not sure how it is working for me)
• Survives in zones 3-9

 
You like?

John