Ipomoea tricolor This is a very rare variety that has pale blue petals containing a darker blue star. Very Beautiful! Enjoy flowers from mid-summer to fall. Ideal for arbors, trellises, fences or trailing down banks or from containers. Sow seeds outdoors after all danger of frost has passed or for earlier blooms start indoors in individual peat pots 2 to 3 weeks before last frost. Soak seed in water for 24 hours prior to planting. Cover seed with 1/4" of fine soil. Hardy in zones 5-9.