1000 YELLOW (DAY) EVENING PRIMROSE (Hookers Evening Primrose) Oenothera Hookeri Flower Seeds This sunshiny yellow flower produces a light, pleasant lemony scent Attracts hummingbirds and hawkmoths Opens its petals in evening and closes them before noon the following day Grows from 2 to 6 feet tall Gather dropped seeds in the fall to replant in the spring