Image 1 of 1 Evening Primrose (Oenothera biennis) $8.00 Pre-order: Evening Primrose plants will be available in early May. Evening primrose is an herbaceous biennial. Add to Garden Added! Pre-order: Evening Primrose plants will be available in early May. Evening primrose is an herbaceous biennial. Growing Guide LIFE CYCLE Herbaceous biennial SUN EXPOSURE 6-8 hours of direct sunlight SOIL MOISTURE Average SIZE AVERAGE 4' tall, 2' wide SPACING 12" BLOOMS Night-flowering yellow, June-October PAIR WITH Purple coneflower, Yarrow, Bee balm, Wild black currant, Wild blue violet ADVANTAGES Pollinator, Deer-resistant, Fragrant flowers, Family-friendly, Culinary CARE Easy