Buy Flowers › Ruta graveolens - 4" Pot Ruta graveolens - 4" Pot $6.50 Filigreed bluish foliage with yellow umbel flowers, underused tough perennial plant, hardy zone 4-8, 2-3' tall, nice seed heads Add To Cart Added! Filigreed bluish foliage with yellow umbel flowers, underused tough perennial plant, hardy zone 4-8, 2-3' tall, nice seed heads