Verbena (ver-bee-nuh) Vervain, Verbenaceae Faimly. Verbena is a large genus of annuals and perennials, almost all native the US. Attractive, rounded clusters of small, tubular flowers in a large color range from white through every shade of red and blue make the hardy species excellent garden plants. These plants are often fragrant and are in bloom all summer. Fine for the border, the rock garden, as edgings, ground covers and cutting. The spreading habit of most Verbena species, with the accompanying stem rooting, gives a solid mat-like growth that makes a strong accent. Full sun and rich garden soil will produce lots of Verbena flowers.