Hibiscus syriacus 'Diana' is a United States National Arboretum introduction. It has pure white flowers 6 inches in diameter. It grows up to 10 feet high and blooms in mid summer to early fall. Each flower remains open for more than one day, but the plant does not set seed. It is hardy in Zones 5 to 8. Hibiscus syriacus 'Diana' has received the Award of Garden Merit from the Royal Horticultural Society.

When the species was named syriacus, it was thought to have originated in Syria, but it is actually native to China and India. Hibiscus syriacus is the national flower of Korea.