PERENNIAL - Rose 'Zephirine Drouhin' While 'New Dawn' rose graces the arbor leading to the back yard, it's 'Zephirine Drouhin' on the pergola out front. This heirloom from the 1860s is still popular today. It blooms throughout the season with sweetly scented, cerise-pink blooms. Zones 5-9. Test Garden Tip: 'Zephrine Drouhin' is an especially good choice for front yards because the stems have few thorns. In fact, this rose has earned the nickname "the thornless rose."