Oenothera Seeds - Showy Evening Primrose2nd Year Maturity. Showy Evening Primrose oenothera seeds grow one of summer's most familiar, gentle, yet vigorous blooms. Showy Evening Primrose is easy to grow from seed and is a hardy native to the heat and drought of the American midwest. Showy Evening Primrose seeds promise your garden gorgeous 18 24 tall oenotheras bursting with delicate 2 3 tricolored blooms of pink, lavender, and ivory. Showy Evening Primrose oenothera is an ideal grow for