Narrow-leaved Vervain forms tidy clumps of narrow, grass-like blue-green leaves. In late spring and early summer, it produces small, vivid blue to violet flowers with yellow centres. Despite its grass-like appearance, it is actually a member of the iris family (Iridaceae). It naturally grows in meadows, open woodlands, clearings, moist prairies, and grassy areas. It prefers average to moist, well-drained soil. It is an excellent choice for the front of a native border, meadow, or naturalized lawn. It forms neat clumps and is generally well behaved. Avoid planting it in areas that remain soggy year-round. It can go somewhat dormant during periods of summer heat or drought and return when conditions improve.