Get some blue tones in your late season garden with the blooms of azure monkshood (Aconitum fischeri). Flowers appear on spikes, with each blossom resembling a helmet or hood. Place plants in rich soil in part shade. If soil is consistently moist, this perennial can also thrive in full sun. Monkshood is an important food source for late season pollinators. Plants grow 18 to 24 inches tall by 12 to 18 inches wide. Hardy in Zones 4-8.