New Hampshire's state flower is lilac. Is there a more widely known flower in the world? As pretty as this flower and its image are, they can't show you the greatest reason for this plant's popularity. The aroma of lilacs must be one of the world's most admired fragrances. We wait in the spring to see the lilacs open, because that means we can go stick our noses in them! Lilac has spread to the wild in CT, DE, IA, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, NC, NH, NJ, NY, OH, OR, PA, RI, SD, TN, UT, VA, VT, WI, WV, BC, NB, NS, ON, PE, QC, and SK. Ives Preserve, Lenawee Co MI, 5/23/11.