Baptisia Australis 'Purple Smoke'

Blue Wild Indigo, False Indigo

Baptisia Australis ‘Purple Smoke’ — commonly sold simply as Baptisia ‘Purple Smoke’ — is a striking false indigo (Baptisia) hybrid known for its smoky violet-lavender flowers held above attractive gray-green foliage and charcoal stems. It’s one of the most popular hybrid selections for perennial borders, prairie plantings, and mixed beds.

Key features
Width / spread: 3–4 ft (90–120 cm) mature spread
Height: 4–5 ft (120–150 cm) tall at maturity, including flower spikes
Flower color: Smoky violet-lavender pea-like flowers on upright racemes
Bloom time: Mid to late spring (spring to early summer)
Foliage: Gray-green, textured clump forming
Form: Upright, clump-forming perennial
Life cycle: Herbaceous perennial

Growing conditions
Sun: Full sun to light shade (best flowering in full sun)
Soil: Average to well-drained; tolerates lean soils once established
Water: Moderate; drought tolerant once established
Hardiness: USDA Zones 4–9

Landscape use
Specimen or focal plant
Back of perennial borders
Prairie or meadow gardens
Mixed perennial beds
Cut flower and pollinator gardens

Notes


A vigorous, long-lived perennial that often takes 2–3 years to fill out a full mound of foliage and blooms, and up to 4 years to reach peak display.



Produces abundant smoky violet flower spikes that contrast nicely with gray-green foliage and dark stems.



Great for structural and vertical interest in sunny garden beds.



Branding / horticultural information

Plant type

Perennial

Height

4-5'

Width

3-4'

Hardiness zones

4–9

Growth rate

Slow

Bloom time

Early Summer, Late Spring

Leaf color

Green

Fall color

Green

Attracts

Butterflies

Soil

Clay, Loamy, Normal

Landscape use

Container, Mass Planting

Deer resistant

Yes

Drought tolerant

No