Columbine Roots Nora Barlow is a charming perennial known for its distinctive, fully double, spurless flowers. The blooms feature layers of pink petals tipped with white, forming pompom-like shapes that bloom from late spring through early summer. While Nora Barlow attracts hummingbirds and butterflies, it is largely ignored by rabbits and deer. Named after Emma Nora Barlow, the granddaughter of Charles Darwin, who was a British botanist and geneticist.