Species

perennialN. America Native

Southern Cross Ironweed

The Story

Plant Bio

Vernonia arkansana 'Southern Cross' is known for its vibrant purple flowers and drought-tolerant nature. It is a perennial that thrives in various soils and is attractive to pollinators.

This cultivar is distinguished by its unique, star-like, silvery-white bracts that frame the purple flowers, creating a striking bicolored effect.

Uses & Benefits:

Vernonia arkansana 'Southern Cross' adds vibrant purple hues to sunny borders, attracting pollinators and enhancing garden biodiversity.

Its drought tolerance reduces water needs, making it ideal for water-wise gardens.

Supports native pollinators, especially bees and butterflies, promoting local ecosystem health.

SpeciesVernonia arkansanaArkansas Ironweed

Essentials

At a Glance

Plant Type

Perennial

Height

36 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

Central North America

Toxicity

Non-toxic to humans and pets

Bloom period

Late summer – Early fall

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds into well-drained soil in early spring for best germination.
Mist cuttings regularly to maintain humidity and promote root growth.
Transplant seedlings after they develop strong roots, typically in late spring.
Thin out crowded plants to improve air circulation and reduce disease risk.
Water deeply once a week during dry periods to encourage healthy growth.
Apply a balanced fertilizer monthly during the growing season for optimal vigor.

Pro Tip

Use well-draining soil and full sun to ensure vigorous growth and vibrant blooms.

Keep It Thriving

Care Guide

Do

Water regularly during dry spells to keep soil moist 🌱
Prune dead or damaged stems to promote bushier growth
Apply organic compost annually to enrich soil quality

Don't

Avoid overwatering which can lead to root rot ❌
Do not neglect pruning, as it encourages healthy flowering
Refrain from planting in overly shaded areas

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Pinch
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildflower meadowAiry borderDrought-tolerant garden edge

Companion Plants

Echinacea purpurea Rudbeckia hirta Salvia nemorosa Gaillardia grandiflora

Multiply

Propagation Methods

Good to Know

Common Questions

Southern Cross Ironweed questions

What zones can Southern Cross Ironweed grow in?

Southern Cross Ironweed is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Southern Cross Ironweed deer resistant?

Yes — Southern Cross Ironweed is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Southern Cross Ironweed bloom?

Southern Cross Ironweed typically blooms in late summer through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Southern Cross Ironweed need full sun?

Southern Cross Ironweed does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Southern Cross Ironweed drought tolerant?

Yes — once established (usually after the first full season), Southern Cross Ironweed handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.