Deep purple flowers are displayed above deep green leaves from August through September on Southern Cross ironweed (Vernonia 'Southern Cross'), a hybrid native ironweed that is relatively short (3 feet tall). This cultivar grows best in full sun, with moderately fertile soils, and only needs water during its establishment period. The flowers attract pollinating insects and hummingbirds, while the seeds are coveted by birds.

This introduction by Intrinsic Perennials is one of the few ironweed cultivars offered on the market.