A Cool Plant, the Name of Which I Do Not Know, Growing in My Yard

This is currently one of my favorite plants. I like it because its buds are pink, but its blossoms are white.

I took a couple of photos trying to get the whole plant, but none of them showed it to advantage. It grows in a mound, with stalks extending out of it, and those are where the blossoms appear.

Anyone recognize it? I'd like to know what it's called.