Seeds from Ohio Spiderwort, Blue Jackets, Cow Slobbers, Jobs Tears, Widow Tears. Slender, erect smooth, bluish to silver stems and leaves topped with spidery clusters of bright blue flowers. It grows best in light to moderate shade for dark green foliage or in full sun for more flowers. Flowers are blue to purple, occasionally white and appear in dense clusters at the tops of the stems. Leaves are long and like those of an Iris. Hardy in zones 3 to 9.