Also known as Common Evening-Primrose, this biennial wildflower grows 2 to 6 feet tall. Its hairy, leafy stalks bear spikes of yellow flowers that open in the evening and close by noon. It can grow in full sun to shade, and in dry, rocky or sandy soils. This plant attracts several moth species, as well as small mammals and deer that eat the foliage, and birds that eat the seeds.