Highly popular, Veronica 'Sunny Border Blue' (Spike Speedwell) is a bushy, upright, clump-forming perennial producing dense, slender spikes of star-shaped, vivid violet-blue flowers from midsummer to fall. Attractive to butterflies, the flowers open from the base upward and sway above the luxurious foliage mound of lance-shaped, dark green, crinkly leaves.