Salvia 'Indigo Spires’ is a vigorous, semi-evergreen perennial known for its long-lasting and showy flower spikes forming a bushy, upright habit with slightly arching stems. The plant bears narrow, dark green leaves and produces tall, loose spikes of deep indigo-blue, tubular flowers from late spring until autumn. It is widely used in borders, cottage gardens, and wildlife-friendly plantings for its extended bloom period, vibrant colour, and ability to attract bees, butterflies, and other pollinators.