This is a sport of a seedling that came from a cross of (H. 'Swoosh' × H. venusta) x H. venusta which originated in Japan and was registered by Mark Zilis of Illinois in 2003. It forms a miniature size mound of green foliage with a white medial (center) variegation. Pale purple flowers bloom in July.

According to The Hostapedia by Mark Zilis (2009), "...makes a decent container plant, but in the garden has a very slow growth rate. The name means "number one" in Japanese."

There is also a cultivar named H. 'Number One'.