Stella de Oro Daylily Longest-Blooming Daylily (1 customer reviews) Flowers longer than any other daylily you can grow—big, ruffled, 2 1/2-in. golden flowers. Grows 15-24 in. tall. Blooms all summer long. Bareroot. Zones 3-9. This plant attracts butterflies. This item will ship in fall 2012. If our fall shipping season is closed, your order will be shipped the following fall.