'Indigo Spires' False Indigo flowers in May and June, producing 12-15" showy spikes of deep violet pea-shaped blooms. The green stems are very sturdy so the flowers are held upright above the clumps. Baptisias have deep taproots and become almost shrub-like in size as they mature. Baptisia 'Indigo Spires' is very tolerant of both dry sites and road salt. A Walters Gardens introduction.