Biennial. Direct sow in fall or early spring by scattering seeds directly on the soil. If started early enough, Evening Primrose will flower the same year it is planted. If not, let over winter and enjoy blooms in early spring. To start indoors, sow seeds very shallow. Needs light to germinate. Transplant 18 inches apart in early spring in full sun. Evening Primrose grows in poor conditions and tolerates draught like conditions. It does best in well-drained soil.
To prevent Evening Primrose from becoming invasive, dead-head the flowers daily as soon as they fade, or harvest the flowering stalk before it drops seeds. Failure to do so can result in many many plants in the years to come.