Baptisia australis

blue wild indigo

  • © Joy Creek Nursery

Outstanding Qualities

This large perennial becomes a bushy mass of sky blue foliage topped with spikes of indigo blue pea-like flowers in early summer. After flowering deep purplish black seed pods develop and remain attractive until fall. Baptisia australis is easy to grow and will thrive with little maintenance and is very long-lived and drought tolerant once established.

Quick Facts

Plant Type: upright perennial

Foliage Type: deciduous

Plant Height: 4 ft. 0 in. (1.22 meters)

Plant Width/Spread: 3 ft. 0 in. (0.91 meters)

Hardiness: USDA Zones 3 to 10

Flower Color: purple

Sun/Light Exposure: full sun

Water Requirements: drought tolerant when established

Seasonal Interest: spring flowers, summer-fall seed pods

Wildlife Associations: bees

Resistant to: rabbits

Colors & Combos

Great Plant Combinations: Helictotrichon sempervirens, Allium hollandicum ‘Purple Sensation’, Ceratostigma willmottianum, Panicum virgatum ‘Rotstrahlbusch’, Perovskia atriplicifolia, Stipa gigantea

Great Color Contrasts: pink, yellow

Great Color Partners: silver, blue, purple

Culture Notes
Blue indigo grows best in full sun with well-drained soil and is tolerant of sandy and clay situations. Rich organic soils and heavy fertilizing can make it floppy and growing it in lean and poor soils will produce a more compact plant. Once established it is drought tolerant. This is a very easy perennial with almost no health issues, but it is slow growing and resents being disturbed so provide it with plenty of room in the garden.