Citron Daylily is one of the favorite perennials of David Rubin, the principal of Land Collective in Philadelphia. The 5” lemon yellow blooms are produced in big numbers on tall scapes in June and July over fountain-like green foliage. The refined flowers look more wild than most Daylilies, making this a good choice for more natural looking landscapes. The vigor of the clumps enables Hemerocallis citrina to function as a tall ground cover when planted in mass. And most exciting of all, Citron Daylily is a night bloomer, opening its fragrant showy blooms near sunset.