|'Rosea' produces pale pink flowers. It has leaf rosettes close to the ground, mid-green, with lance-shaped leaves 1 to 2 inches long. The delicate fragrant primroses open in the day hours. Best planted in spring among other full sun plants. You should divide the clumps every 3 years to encourage flowering. Evening Primroses are excellent perennials for weekend gardeners, since they are simple to grow, with almost no pests or problems.