Blue Mound Rue Perennial - 8 Plants - Ruta - Insect/Mosquito/Cat Repellant Natural insect/mosquito and cat repellant Color of Bloom: Yellow Hardy Zones 5-8, Mature Height: 24-30" Months of Bloom: Summer. Ruta graveolens 'Blue Mound' Immediate shipping in 2 1/2" pots. Dormant shipping in winter.